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Exploring the impact of morphological nanolayers on mixed convection in MHD nanofluids through a neurocomputational approach Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-02-11 Faisal, Aroosa Ramzan, Moeed Ahmad, Waseem Abbas
Purpose This study aims to develop a neurocomputational approach using the Levenberg–Marquardt artificial neural network (LM-ANN) to analyze flow and heat transfer characteristics in mixed convection involving radiative magnetohydrodynamic hybrid nanofluids. The focus is on the influence of morphological nanolayers at the fluid–nanoparticle interface, which significantly impacts coupled heat and mass
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The effect of lateral position of heating surface and angular orientation of latent heat thermal energy storage system on the melting characteristics: a numerical investigation Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-02-06 Himanshu Kumar, Gurjeet Singh, Ankit Yadav, Müslüm Arici
Purpose This study aims to address the low thermal conductivity and suboptimal performance of phase change materials (PCMs) by examining the impact of geometric adjustments on their melting rate. Design/methodology/approach A two-dimensional numerical model was created to investigate the effect of different positions and angular inclinations of the inside heating surface (IHS) on the melting rate of
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Supercritical CO2 foaming and mechanical properties of thermoplastic polyurethane based on molecular structure J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-02-06 Chenyang Niu, Xiulu Gao, Yichong Chen, Weizhen Sun, Ling Zhao, Dongdong Hu
The molecular structures of thermoplastic polyurethane (TPU) affect its microphase separation and foaming behavior. Three aliphatic TPUs were studied to investigate the influence of their molecular structures on their crystallization behavior, shear rheological properties, mechanical properties, and foaming behavior. The experimental results indicated that the branched structure and hard segment content
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Supercritical CO2 assisted extraction, purification and modelling of free fatty acids from the crude mixture – A case study of tallow hydrolysis J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-02-04 EK Anagha, R. Sariga, K. ShyamSundar, Rames C. Panda, M. Helen Kalavathy, S.N. Naik
Tallow, a by-product of the leather-industry, is widely used in pharmaceuticals and oleochemical applications as a source/precursor of glycerol, obtained by aqueous-hydrolysis under high-pressure-temperature from a hydrolyzing-tower. Though standard procedures of extracting glycerol from the bottom-product are well established, the purification of fatty-acids (FA) from the top crude-mixture needs attention
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Investigation of temperature jump, first and second-order velocity slip effects on blood-based ternary nanofluid flow in convergent/divergent channels Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-02-05 Tunahan Gunay, Duygu Erdem, Ahmet Ziyaettin Sahin
Purpose High surface area-to-volume ratios make nanoparticles ideal for cancer heat therapy and targeted medication delivery. Moreover, ternary nanofluids (TNFs) may possess superior thermophysical properties compared to mono- and hybrid nanofluids due to their synergistic effects. In light of this information, the objective of this article is to examine the blood-based TNF flow within convergent/divergent
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Applications of ionic liquids in improving CO2 miscibility in crude oil for enhanced oil recovery and CO2 sequestration applications J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-02-02 Mohammed A. Al-Hakami, Ahmed Farid Ibrahim, Khaled Z. Abdelgawad
Innovation and sustainability are critical for maximizing reserves in the petroleum industry, especially in deep heavy oil reservoirs where traditional thermal EOR techniques often underperform. CO2-flooding offers a promising alternative, with its effectiveness dependent on achieving minimum miscibility pressure (MMP). Reducing MMP offers higher recovery factors while avoiding issues due to formation
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High-pressure phase behavior of the carbon dioxide-trifluoropropylisobutyl polyhedral oligomeric silsesquioxane binary system J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-29 Alican Ertas, Cerag Dilek
The solubility of a bifunctional polyhedral oligomeric silsesquioxane, trifluoropropylisobutyl (TFIB) POSS, in supercritical carbon dioxide (scCO2) was investigated. In the temperature and pressure ranges of 308 K to 323 K and 8.8 MPa to 14.5 MPa, respectively, TFIB POSS is soluble in scCO2 up to 2.0 × 10−2 by weight fraction corresponding to 1.0 × 10−3 by mole fraction, which is between the solubility
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Three-dimensional analysis of turbulent twin-swirling jets onto a heated rectangular prism in a channel Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-30 Muhammed Gur, Hakan Oztop, Nirmalendu Biswas, Fatih Selimefendigil
Purpose The purpose of this study is to investigate the impact of swirling jet flow on the cooling performance of a heated rectangular prism placed within a channel. The primary aim is to explore the influence of varying aspect ratios (AR) of the prism and different fluid Reynolds numbers (Re) on the cooling efficiency. Design/methodology/approach The numerical analysis is performed using a finite
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Optimization of fin for rectangular microchannel printed circuit heat exchanger using supercritical CO2 as working fluid J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-28 Yan Ren, Le Zeng, Shaogeng Zhong, Weidong Wu, Yingying Yang, Qiguo Yang
To improve the performance of printed circuit heat exchanger (PCHE) in the supercritical carbon dioxide (SCO2) Brayton cycle system, the mathematic-physical model of the heat exchange unit was established, based on a new-type rectangular microchannel PCHE (RM-PCHE) manufacturing by total-etching technology in this study. And the influence mechanism and laws on the flow and heat transfer of the different
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Mixed convection in a partially and differentially heated cavity − a finite volume complete flux analysis Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-28 B. V. Rathish Kumar, Chitranjan Pandey
Purpose The purpose of this study is to derive a physics based complete-flux approximation scheme by solving suitable nonlinear boundary value problems (BVP) for finite volume method for mixed convection problems, to study the mixed convection phenomenon inside partially and differentially heated cavity for various sets of flow parameters. And, to study the impact of source terms on the cell-face fluxes
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On a holistic investigation of implicit/explicit/semi-implicit GS4-I framework and time step control for unsteady fluid dynamics Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-27 Yazhou Wang, Kumar K. Tamma, Dean J. Maxam, Tao Xue
Purpose This paper aims to design and analyze implicit/explicit/semi-implicit schemes and a universal error estimator within the Generalized Single-step Single-Solve computational framework for First-order transient systems (GS4-I), which also fosters the adaptive time-stepping procedure to improve stability, accuracy and efficiency applied for fluid dynamics. Design/methodology/approach The newly
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The role of flow angle in mixed convection and vortex-induced vibration of a thermally controlled elastic cylinder Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-23 Mostafa Esmaeili, Hossein Fakhri Vayqan, Amir Hossein Rabiee
Purpose This study aims to investigate the effects of thermal buoyancy and flow incidence angles on mixed convection heat transfer and vortex-induced vibration (VIV) of an elastically mounted circular cylinder. The focus is on understanding how varying these parameters influences the vibration amplitudes in both the x and y directions and the overall heat transfer performance. Design/methodology/approach
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Numerical investigation of wave dynamics in laminar falling films: influence of Kapitza number and inclination angle Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-23 Yuanxiang Chen, Jian Zheng, Yue Liu, Asensio Oliva Llena, Jesus Castro Gonzalez
Purpose This study aims to optimize the design of falling film heat exchangers by providing a deeper understanding of wave characteristics and capillary flow in laminar inclined falling films at low Reynolds numbers. The focus is on the effects of different Kapitza numbers, influenced by fluid properties and inclination, on the interfacial wave behavior. Design/methodology/approach A numerical investigation
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Boundary and interior layer phenomena in coupled multiscale parabolic convection–diffusion interface problems: efficient numerical resolution and analysis Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-22 Aishwarya Jaiswal, Sunil Kumar, Higinio Ramos
Purpose This paper aims to study boundary and interior layer phenomena in coupled multiscale parabolic convection–diffusion interface problems and to present their efficient numerical resolution and analysis. Design/methodology/approach This study includes cases in which the diffusion parameters are small, distinct and can differ in order of magnitude. The source term is considered to be discontinuous
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Preparation of hesperetin-polyvinylpyrrolidone sub-microparticles by supercritical anti-solvent technique for improved anti-cancer efficiency J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-21 Xiao-Chang Lu, Biao-Qi Chen, Sheng-Qing Li, Jian-Fei Xu, Ranjith Kumar Kankala, Shi-Bin Wang, Ai-Zheng Chen
The poor water solubility of hesperetin (HST) has impeded its relevant medical applications. To address this problem, the supercritical anti-solvent (SAS) technique was used to prepare HST-polyvinylpyrrolidone (HST-PVP) sub-microparticles. Additionally, the Box-Behnken Design was used to optimize three parameters (temperature, total solute concentration, and pressure) to determine the optimal process
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Influence of radiative heat transfer on hybrid nanofluid across a curved surface with porous medium Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-21 Roopa K.R., Dinesh P.A., Sweeti Yadav, Oluwole Daniel Makinde
Purpose The purpose of this study is to examine how fluid flow and heat transfer are affected by the influence of hybrid nanofluids flowing across a stagnation zone of a stretching curved surface. Stagnation point flow has garnered considerable attention over the past few decades. This is because many technical applications, such as the cooling of nuclear reactors and rotating equipment divisions,
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A new supercritical extraction equipment in the Amazon: Supercritical extractor efficiency upgrade provided by gas booster performance J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-17 Ana Paula de Souza e Silva, Flávia Cristina Seabra Pires, Maria Caroline Rodrigues Ferreira, Maria Eduarda Ferraz de Carvalho, Letícia Maria Martins Siqueira, Fernando de Freitas Maués de Azevedo, Eduardo Gama Ortiz de Menezes, Raul Nunes Carvalho Junior
The Amazon bioeconomy demands technologies that transform raw materials into high-value bioproducts. This work presents the assembly of a supercritical extractor designed for the Amazon, aiming for efficiency and adaptation of the equipment to the local conditions such as humidity and temperature that provide a directly influence in the phase equilibrium in the CO2 cylinder. Therefore, a gas booster
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Employing supercritical n-butanol to remove the EVA film for the delamination of photovoltaic laminated module J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-16 Xuwen Wang, Zhifeng Liu, Haoda Ruan, Xinyu Li, Lei Zhang
The rapid advancement of the photovoltaic (PV) industry has elevated the recycling and reuse of decommissioned PV modules to critical challenges, essential for tackling environmental concerns and achieving resource reutilization. To facilitate the efficient layering of PV modules and recovery of valuable materials, this study proposes a PV module degradation and recycling process utilizing supercritical
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Effect of CO2 addition on crocin i extraction from gardenia fruits using CO2-expanded deep eutectic solvent J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-16 Yiheng Dou, Yoshito Oshima, Makoto Akizuki
The use of the CO2-expanded liquid method for enhancing the extraction performance of deep eutectic solvents (DES) was evaluated. The extraction of crocin I from gardenia fruits using a DES composed of choline chloride and propylene glycol (1:3) was enhanced by the formation of a CO2-expanded DES. Visualization showed a biphasic system in which the DES-rich phase, and not the CO2 phase, extracted crocin
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Numerical research on two typical flow structures and aerodynamic drag characteristics of blunt-nosed trains Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-16 Sha Zhong, Mingzhi Yang, Bosen Qian, Lei Zhang, Dongqing He, Tongtong Lin, Fue-Sang Lien
Purpose This study aims to provide new insights into aerodynamic drag reduction for increasingly faster blunt-nosed trains, such as urban and freight trains. Specifically, this work investigates two distinctly different wake structures and associated aerodynamic drag of blunt-nosed trains. Design/methodology/approach Three typical cases of blunt-nosed trains with 1-, 2- and 3-m nose lengths are selected
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Optimizing bioconvective heat transfer with MHD Eyring–Powell nanofluids containing motile microorganisms with viscosity variability and porous media in ciliated microchannels Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-16 Junaid Mehboob, R. Ellahi, Sadiq M. Sait, Noreen Sher Akbar
Purpose This paper aims to optimize bioconvective heat transfer for magnetohydrodynamics Eyring–Powell nanofluids containing motile microorganisms with variable viscosity and porous media in ciliated microchannels. Design/methodology/approach The flow problem is first modeled in the two-dimensional frame and then simplified under low Reynolds number and long wavelength approximations. The numerical
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Comparative analysis of supercritical-based and chemical-based decellularization technique for meniscus tissue J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-15 Gizem Zihna, Busra Kilic, Bengisu Topuz, Gulcin Gunal, Halil Murat Aydin
The increasing prevalence of meniscus injuries highlights the critical need for the development of effective repair strategies. Currently, there is ongoing exploration of materials possessing microscopic and macroscopic characteristics akin to authentic meniscus tissue. In this study, meniscus tissue was subjected to a comparative evaluation of two different decellularization techniques which one of
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Rayleigh-type wave in thermo-poroelastic media with dual-phase-lag heat conduction Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-15 Manjeet Kumar, Priyanka Lather, Li-Yun Fu, Neelam Kumari, Pradeep Kaswan, Li Nianqi, Manjeet Kumari
Purpose The purpose of this paper is to investigate the propagation of Rayleigh-type surface wave in a porothermoelastic half-space. This study addresses the impact of surface pores characteristics, specific heat, temperature, porosity, wave frequency, types of rock frame and types of pore fluids on the propagation characteristics of Rayleigh-type wave. Design/methodology/approach A secular equation
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Entropy analysis of convective nanofluid flow with Brownian motion in an annular space between confocal elliptic cylinders Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-14 Boussouffi Mustapha, Amina Sabeur
Purpose This study aims to provide an in-depth analysis of entropy generation (EG) during natural convection within the annular space between confocal elliptic cylinders, with a specific focus on the influence of Brownian motion on nanofluid behavior. Design/methodology/approach A finite volume control method was used to conduct a detailed numerical analysis, examining the behavior of various nanofluids
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Rheology of Bingham viscoplastic flow triggered by a rotating and radially stretching disk Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-14 Mustafa Turkyilmazoglu, Ioan Pop
Purpose This study aims to investigate the flow and heat transfer characteristics of a Bingham viscoplastic fluid subjected to the combined effects of axial rotation and radial stretching of a circular disk. Building upon existing models for Bingham fluids on stationary walls, we extend the formulation to incorporate the effects of a linearly stretching disk using von Kármán similarity transformations
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Numerical investigation on hydrothermal characteristics of microchannel heat sinks with PCM inserts for effective thermal management applications Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-13 Naga Ramesh Korasikha, Karthikeya Sharma T, Amba Prasad Rao G
Purpose The purpose of the paper is to develop an efficient thermal management system, which effectively dissipate the heat generated from the electronic devices. The present paper focuses at the modeling of microchannel heat sinks (MCHSs) with phase change materials (PCMs) insets to deal with the fluctuating heat generated from the electronic components. Design/methodology/approach In this paper,
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Fluid phase behavior of asymmetric synthetic mixture + gas: Experimental and modeling studies J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-13 Hugo Andersson Dantas Medeiros, Jean-Patrick Bazile, Filipe Xavier Feitosa, Hosiberto Batista de Sant’Ana, Jean-Luc Daridon
This study investigates the high-pressure phase behavior of synthetic systems formed by the blending of a ternary heavy liquid mixture: 2,2,4,4,6,8,8 heptamethylnonane + dodecylcyclohexane + o-terphenyl – with light gas mixtures. Two different gas mixtures were examined: methane + ethane + propane and methane + ethane + propane + carbon dioxide. Five global compositions were studied for the first gas+liquid
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Enhanced melting dynamics of phase change material (PCM) based energy storage system combining modified fin and nanoparticles under solar irradiation Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-13 Anjan Nandi, Nirmalendu Biswas
Purpose This study aims to investigate the thermal performance enhancements of phase change materials (PCMs) through the integration of extended fins and CuO nanoparticles under the impact of solar irradiation. The research focuses on improving the melting behavior and thermal efficiency of PCM-based energy storage systems to facilitate the design of more efficient energy storage solutions. Design
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Enhancement of thermo-hydraulic transport within a round tube using a twisted-staggered concave/convex dimples tape Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-13 Shiang-Wuu Perng, Horng Wen Wu, Yi-Ling Guo, Tao-Hsuan Liu
Purpose The purpose of this study is to value the thermal and hydraulic transport augmentation of turbulent fluid flow within the round-pipe axis fixed by a twisted-staggered concave/convex dimples tape. Design/methodology/approach This study meets the report’s novel design by axis-inserting a twisted plastic tape with staggered concave/convex dimples of varying diameters (4 and 6 mm) and depths (1
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A TVD WAF scheme based on an accurate Riemann solver to simulate compressible two-phase flows Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-08 Dia Zeidan, Abdelmjid Qadi El Idrissi
Purpose This study aims to propose a robust total variation diminishing (TVD) weighted average flux (WAF) finite volume scheme for investigating compressible gas–liquid mixture flows. Design/methodology/approach This study considers a two-phase flow composed of a liquid containing dispersed gas bubbles. To model this two-phase mixture, this paper uses a homogeneous equilibrium model (HEM) defined by
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Monodisperse protein nanoparticles production by supercritical assisted atomization J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-07 Hsien-Tsung Wu, Yi-Jia Tu, Yu-Xuan Huang, Kim Hoong Ng
Monodisperse nanoparticles of bovine serum albumin (BSA) and lysozyme (LYS) were generated using supercritical assisted atomization (SAA). The impact of several key factors, including the solvent effect, precipitator and saturator temperatures, concentration of protein solutions, and the flow rate ratio of carbon dioxide to protein solutions, on the morphology and size of protein particles was examined
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Studying the rifampin solubility in supercritical CO2 with/without co-solvent: Experimental data, modeling and machine learning approach J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-04 Hamed Peyrovedin, Seyed Ali Sajadian, Sara Bahmanzade, Kamiar Zomorodian, Mohammad Khorram
Rifampin is an effective tuberculosis drug. This study examines drug solubility in supercritical carbon dioxide at 308 K to 338 K and 12 MPa to 30 MPa. This study investigates Rifampin solubility using ethanol as a co-solvent. The experimental data is then used to develop a solute-solvent system model using semi-empirical correlations, the Peng-Robinson equation of state, and machine learning models
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The role of water in the oxidation of lead and bismuth by high-density water-oxygen fluid J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-04 Oxana N. Fedyaeva, Aleksander P. Grebennikov, Anatoly A. Vostrikov
The paper presents the research results on oxidation of liquid lead (Pb)l and bismuth (Bi)l by high density water-oxygen fluid (ρH2O = 0.91–4.69 and ρO2 = 0.75–2.93 mol/dm3). Time dependences of the pressure were obtained by the method of H2O/O2 fluid injection into the reactor at different temperatures (623–873 K), from which the dependences of the amount of O2 in the reaction mixture were calculated
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A viscous model of wind fields in single-cell tornado-like vortices Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2025-01-06 Sanjay Kumar Pandey, Shruti
Purpose This study aims to generalize the Baker and Sterling’s model (2017) by additionally considering viscous flow and introducing a cylindrical central zone of low pressure. Unlike other models, in which the azimuthal velocity is deduced as a special solution using the variables-separable approach, the novelty in this is that it yields a more general form. Design/methodology/approach Flow is incompressible
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Short-term supercritical heat transfer: In memory of Anneke Levelt Sengers J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-03 Pavel Skripov, Sergey Rutin, Lin Chen
The paper is dedicated to the memory of Anneke Levelt Sengers (Johanna/Anneke/Maria Henrica Levelt, 1929–2024), a world-renowned scientist on liquid-vapor critical phenomena. It summarizes the results of pulse heating experiments performed under conditions of short-term (units of ms) powerful heat release in supercritical-pressure water. The pressure, being the parameter of the experiment, was varied
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Correlating mean particle size of pure solids in supercritical antisolvent processes using dimensional analysis with the Buckingham π-theorem J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-03 Juan C. de la Fuente, Yusuke Shimoyama
In supercritical antisolvent processes, two correlations have been proposed to estimate the mean particle size of precipitated pure solid compounds. These easy-to-use correlations, each with six adjustable coefficients were developed by applying dimensional analysis based on the Buckingham π-theorem, relating the particle size to feeding, thermodynamic, and mechanical process parameters. These correlations
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Continuous biodiesel production using canola oil and supercritical methanol with the aid of CaO/carbon nanotube catalyst J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-03 Chin Seng Liew, Ken Furuta, Mohammed Ahmed Mohammed Ali, Yukihiko Matsumura
A catalyst can improve the rate of supercritical transesterification, thereby reducing the construction costs of the reactor. Although calcium oxide (CaO) is an effective catalyst, it has low stability and requires a support structure. Multiwall carbon nanotubes (MWCNTs) have high porosity, large specific surface area, and high tensile strength, and could serve as support structures. Therefore, this
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Measurements and prediction of dynamic viscosity of binary mixtures of carbon dioxide and methanol, ethanol and 1-propanol at 313–343 K and 15–30 MPa J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-02 Norihiro Onodera, Ryuichi Oguro, Toshitaka Funazukuri
The dynamic viscosity ηm of binary mixtures of carbon dioxide and methanol/1-propanol was measured on the basis of the pressure drop in a packed bed, which was calculated using the Ergun equation, at temperatures from 313.2 K to 343.2 K and pressures from 15 MPa to 30 MPa over the entire range of methanol/1-propanol composition. The accuracy of the rough-hard-sphere (RHS) model with various combining
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Advances and trends in compressed fluid extraction to recovering bioactive compounds from avocado: Effect of extraction parameters, biological properties, and applications J. Supercrit. Fluids (IF 3.4) Pub Date : 2025-01-02 Diego Fernando García-Ramón, Jaime Valdiviezo-Marcelo, Christianne Elisabete da Costa Rodrigues, Juliane Viganó, Alessandra Lopes de Oliveira
Avocado is widely recognized for its rich nutritional profile and as a valuable source of bioactive compounds with well-established health benefits. Traditional extraction methods, however, often involve the use of harmful solvents, extended processing times, and high temperatures, which can degrade heat-sensitive compounds. To overcome these challenges, advanced extraction techniques such as pressurized
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Analysis of heat transfer and AuNPs-mediated photo-thermal inactivation of E. coli at varying laser powers using single-phase CFD modeling Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2024-12-31 Aimad Koulali, Paweł Ziółkowski, Piotr Radomski, Luciano De Sio, Jacek Zieliński, María Cristina Nevárez Martínez, Dariusz Mikielewicz
Purpose In the wake of the COVID-19 pandemics, the demand for innovative and effective methods of bacterial inactivation has become a critical area of research, providing the impetus for this study. The purpose of this research is to analyze the AuNPs-mediated photothermal inactivation of E. coli. Gold nanoparticles irradiated by laser represent a promising technique for combating bacterial infection
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Asymptotic Widom line of supercritical fluid within the scaling theory J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-31 M.Yu. Belyakov, V.D. Kulikov
The work is devoted to a theoretical study of fluid thermodynamic features in the supercritical region. The analysis is carried out within the framework of the scaling theory based on the general equation of state of a near-critical fluid. Analytical expressions for fluid characteristics lines on the pressure–temperature plane are obtained. It is shown that close to the critical point the characteristic
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Ibuprofen loaded gelatin-siloxane gels prepared by supercritical CO2-assisted impregnation/deposition for controlled drug release and tissue engineering J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-30 Ulisses Silva do Nascimento, Carolina Kafka Neves, Erik Felix dos Santos, Chekwube Andrew Ezegbe, Laurent Rodrigues Rezende, Juliana Marchi, Christiane Bertachini Lombello, Lígia Passos Maia-Obi
Gelatin-based gels are suitable for biomedical applications and have potential to be impregnated using scCO2 thanks mainly to their morphology. Aiming to obtain ibuprofen loaded gelatin-siloxane cryogels suitable for controlled drug release and tissue engineering, the impregnation/deposition of the drug was studied in both cryogels and xerogels in scCO2 at 25 MPa and 35 °C, by varying its concentrations
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Precipitation of micro and nanosilica and PdO/silica particles from SEDS technique using supercritical CO2 J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-28 Alexander Junges, Thais Feiden, Bruno Fischer, Marcos Hiroiuqui Kunita, Silvana Mattedi, Claudio Dariva, Silvia Maria Egues, Eunice Valduga, Elton Franceschi
This study utilized the Solution-Enhanced Dispersion by Supercritical Fluids (SEDS) technique to precipitate micro and nanosilica and PdO/silica composites using supercritical CO2 as an anti-solvent and an ionic liquid as an adjuvant. Unlike previous studies, this work uniquely combines the sol-gel process with supercritical CO2 technology, introducing ionic liquids to significantly enhance the surface
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Supercritical CO2 impregnation of nanodiamonds into polymethylmethacrylate film and the film’s optical property J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-27 Jinhua Hu, Kunitoyo Osawa, Kaoru Tada, Kentaro Taki, Hirohisa Uchida, Kazuhiro Tamura
The supercritical CO2 (scCO2) impregnation of nanodiamond (ND) in polymethylmethacrylate (PMMA) film was carried out over the pressure ranges of 12 MPa to 20 MPa and temperatures of 40 °C to 100 °C. The amount of ND impregnated in ND-PMMA composite film, and the refractive indices of the film were investigated. The refractive index increased linearly with the amount of ND accumulated in the film. The
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A novel approach to investigating the relation between color strength and relative dye concentration and to controllably modifying the color strength of dyed polyester fabrics through supercritical fluid treatment J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-27 Jianhua Ren, Mitsuru Mizuno, Isao Tabata, Teruo Hori, Kazumasa Hirogaki
Widely utilized polyester fibers generally have excellent color fastness, making it quite challenging to controllably modify their color strength (K/S value), especially in regulated decolorization. In this study, the relation between the color strength and the relative dye concentration of dyed polyester fabrics was investigated based on the principle that dyes may migrate and reach redistribution
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Sequential extraction of industrial spent coffee grounds using pressurized fluids as solvents J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-27 Akel F. Kanaan, Kallynca C. dos Santos, Maria A.H. Menezes, Fabiane Hamerski, Fernando A.P. Voll, Marcos L. Corazza
This study explores the sequential extraction of valuable compounds from industrial spent coffee grounds (SCG) using sustainable pressurized fluid methods: compressed propane (CPE), pressurized liquid extraction (PLE), and supercritical CO2 with ethanol (coscCO2). The extracts were analyzed for yield, fatty acid profile, total phenolic content (TPC), and antioxidant activity (AA). Sequential extractions
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Optimization of subcritical water extraction parameters of phlorotannins from brown alga (Ecklonia stolonifera): Bipotentialities and possible applications J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-26 Ye-Seul Park, Vikash Chandra Roy, Jin-Seok Park, Wei Zhang, Byung-Soo Chun
The study aimed to identify the optimal subcritical water extraction (SWE) parameters for phlorotannin (marine polyphenols) from Ecklonia stolonifera using response surface methodology (RSM). The reaction temperature, time, and the solid-to-solvent ratio were optimized, and the best extraction conditions were 198.5°C, 36.21 min, and 12.23 g/mL, respectively. Under optimal conditions, the total phlorotannin
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Effect of ethanol on supercritical CO2 solvent densities J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-24 Clément Sevestre, Julien Chabanon, Thomas Deleau, Christophe Coquelet
The development of new industrial applications in the pharmaceutical, food, and cosmetic fields uses supercritical carbon dioxide as a solvent or antisolvent in their processes for extracting non-polar molecules. Ethanol (EtOH) is added in small quantities to isolate a polar molecule during a unit operation by solubilization or precipitation. Density measurements in pure carbon dioxide (CO2) and in
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Supercritical CO2 assisted metallization of polyethylene terephthalate yarns with various twist number J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-24 Hikaru Kondo, Tomoyuki Kurioka, Kazuhiro Shibata, Takumi Suda, Wan-Ting Chiu, Chun-Yi Chen, Yuko Mima, Roka Ueno, Arisa Jinno, Hiromichi Kurosu, Masato Sone, Tso-Fu Mark Chang
This study investigates the metallization of polyethylene terephthalate (PET) yarns with varying twist numbers using the supercritical CO2 (scCO2) catalyzation process. The research includes an analysis of the impact on surface morphology, crystallinity, and electrical resistance. The crystallinity of the PET yarns is affected by treatment in pure scCO2 and scCO2 containing palladium hexafluroacetylacetonate
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Study on phase change energy storage process in hot-water oil displacement system with composite fin structure Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2024-12-24 Qiang Cui, Xiao Liu, Zhen Zhang, Xiaoqin Li, Shasha Yang
Purpose This study aims to propose a new composite metal fin structure to enhance heat transfer efficiency during the phase change energy storage (PCES) process in a hot water oil displacement system. Design/methodology/approach PCES numerical unit is developed by varying the radii of annular fins and the number of corrugated fins. The impact of the finned structure on melting characteristics, energy
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Supercritical CO2-assisted preparation of catalytically-active Pd/Ni nanoparticle-embedded carbon from a metal-organic framework J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-19 Kiyoshi Matsuyama, Masashi Eiro, Ayano Shoji, Takafumi Kato
A metal nanoparticle (NP)-carbon composite derived from metal-organic frameworks (MOFs) has garnered significant attention for its high catalytic activity. This study develops a simple method for preparing Pd/Ni NP-embedded carbon from MOFs. Palladium(Ⅱ) acetate (Pd(OAc)2) is used as the precursor for Pd NPs and is loaded into the pores of Ni-MOF-74 using supercritical carbon dioxide (scCO₂) assisted
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Homogenization methods for thermal study of support structure in laser powder bed fusion (L-PBF) – application to process numerical modeling Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2024-12-18 Yancheng Zhang, Hugo Behlal, Charles-André Gandin, Oriane Senninger, Gildas Guillemot, Michel Bellet
Purpose This paper aims to report on a homogenized model for the anisotropic thermal conductivity of support structures constructed by the laser powder bed fusion (L-PBF) process, and its application to the numerical simulation of the L-PBF process. Design/methodology/approach Considering both analytical and numerical approaches, the model is developed across a temperature interval encompassing the
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Aerodynamic characteristics of the race car in pitch and roll attitude Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2024-12-17 Xiaojing Ma, Jie Li, Jun Zhao, Jiliang Chen
Purpose Aerodynamics plays a crucial role in enhancing the performance of race cars. Due to the low ride height, the aerodynamic components of race cars are affected by ground effects. The changes in pitch and roll attitudes during the car’s movement impact its ride height. This study aims to analyze the aerodynamic characteristics of race cars under specific pitch and roll attitudes to understand
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Uvaia (Eugenia pyriformis Cambess) fruit: Exploring its antioxidant potential through pressurized liquid extraction J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-16 Isadora de Souza Lopes, Rafael Augusto Juliato, Cristiane Conte Paim de Andrade, Ana Clara Troya Raineri Fiocco, Renata Galhardo Borguini, Manuela Cristina Pessanha de Araújo Santiago, Luiz Henrique Fasolin, Carolina Siqueira Franco Picone
Uvaia (Eugenia pyriformis Cambess) is a Brazilian native fruit with a high concentration of phenolic compounds. In this study, we optimized the extraction of flavonoids and other phenolic compounds from uvaia pulp (UP) and seed (US) by Pressurized Liquid Extraction (PLE) using an ethanolic solution as solvent. Both temperature and ethanol concentration enhanced the extraction of the phenolics from
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Exploring the potential of deep eutectic systems for the preservation of the chemical profile and antibacterial potential of dill (Anethum graveolens L.) supercritical CO₂ extracts J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-16 Jelena Vladić, Igor Jerković, Valentina Pavić, Dragoljub Cvetković, Stela Jokić, Krunoslav Aladić, Kristian Pastor, Ana Rita C. Duarte
This study evaluated the potential of deep eutectic systems (DESs) to enhance the chemical and microbiological stability, as well as the antibacterial activity of dill (Anethum graveolens L.) supercritical extracts, rich in carvone and limonene, over six months of storage. Various betaine-based DESs were tested for their ability to preserve the chemical integrity and enhance the antibacterial properties
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Study of mechanism, kinetics, and product characterization of thermal and catalytic liquefaction of Northeastern Indian coals using supercritical toluene J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-16 Govind Dubey, Prabu Vairakannu, Pankaj Tiwari
The present research aimed at the direct coal liquefaction (DCL) of three Indian coals with toluene and Fe2O3 catalyst within a temperature range of 400 ℃- 450 °C. The maximum overall conversion of 41.87 wt% and oil yield of 16.25 wt% was observed for lignite coal, at 60 min residence time and 450 ℃ for catalytic, with an increase of 6 % and 4.72 %, respectively, compared to that of thermal liquefaction
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Radiation and heat generation effect on MHD natural convection in hybrid nanofluid-filled inclined wavy porous cavity incorporating a cross-shaped obstacle Int. J. Numer. Methods Heat Fluid Flow (IF 4.0) Pub Date : 2024-12-17 Lioua Kolsi, A.M. Rashad, Nirmalendu Biswas, M.A. Mansour, Taha Salah, Aboulbaba Eladeb, Taher Armaghani
Purpose This paper aims to explore, through a numerical study, buoyant convective phenomena in a porous cavity containing a hybrid nanofluid, taking into account the local thermal nonequilibrium (LTNE) approach. The cavity contains a solid block in the shape of a cross (+). It will be helpful to develop and optimize the thermal systems with intricate geometries under LTNE conditions for a variety of
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Measurement of solubility of terephthalic acid in water under hydrothermal conditions J. Supercrit. Fluids (IF 3.4) Pub Date : 2024-12-15 Yu Su, Qingxin Zheng, Yoshiki Suga, Masaru Watanabe
Here, the solubility of terephthalic acid (TPA) in water was measured under hydrothermal conditions at temperatures from 423.15 K to 623.15 K by a semi-dynamic gravimetric system. The whole process, using water as the only solvent, was considered safe and environmentally friendly. The results indicated that the TPA solubility in water increased exponentially with the temperature. Particularly, at 573