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Numerical study on transient coke deposition and heat transfer characteristics of hydrocarbon fuel in a mini-channel under varying wall heat flux Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-26 Guilin Wang, Luyang Han, Shuyuan Liu, Pengfei Wang, Weimeng Zhang
Dynamic coke deposition has significant influence on flow and heat transfer characteristics of regenerative cooling using hydrocarbon fuel. In the present work, the effect of coke deposition on flow and heat transfer performance of hydrocarbon fuel, n-Decane is numerically investigated under different heating modes including the constant heat flux (CHF), the periodic heat flux (PHF) and staged heat
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A comprehensive parametric study and multi-objective optimization of turbulent jet array impingement for uniform cooling of gas turbine blades with minimized compression power Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-25 Hooman Bahman Jahromi, Farshad Kowsary
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Application of the adaptive method to determine the process noise in the extended Kalman filter to estimate the parameters of the two dimensional inverse heat transfer problem Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-23 Ramin Sajedi, Farshad Kowsary, Ahmad Kahrbaeiyan, Javad Faraji
To deal with inverse nonlinear heat transfer problems in a two-dimensional heat conduction problem, this paper presents a hybrid approach combining fuzzy logic and the extended Kalman filter (EKF). The proposed algorithm has been applied to the real-time reconstruction of the temperature field, time-varying convective heat transfer coefficient, and time-varying boundary heat flux using temperature
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Computational characterisation of the heat flow meter method applied to moist bio-based insulating building materials Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-22 Daniela Florez, Partrick Perré, César Segovia, Romain Rémond
This paper investigates the role of moisture content on the measurement of the thermal conductivity of wood-based low-density fibreboards (LDFs) used for building insulation. To that purpose, a computational code of coupled transfers was used to simulate the widely used Heat Flow Meter (HFM) method. To widen the range of study, the thermal conductivity is obtained with a mixing law model to account
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Experimental and numerical study of the interaction between tempered glass fallout and enclosure fire dynamics Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-22 Xiaoqing Li, Yu Wang
Tempered glass, as an important type of safety glazing, is extensively used in high-rise buildings. However, little is known about the fallout behavior of tempered glass in the compartment with different fire locations. Therefore, in this work, the exposed framed glass panes with the dimension of 815 × 815 × 6 mm were heated by a pool fire in the compartment. The fuel pans were placed at six different
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Effects of the circumferential casing groove configuration on aerothermal performance of a transonic turbine stage Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-21 Weiqi Li, Zhi Tao, Liming Song, Jun Li, Zhenping Feng
In order to control tip leakage flow and improve the tip aerothermal performance, a circumferential casing groove (CG) configuration is proposed. Taking the typical transonic turbine stage TTM (Thermal Turbomachinery and Machine Dynamics) as the research object, the effects of CG with different heights (), initial locations () and widths () on the aerodynamic loss of the turbine stage and heat transfer
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Analysis of photothermal coupling of titanium nitride nanorods applied to near-infrared photothermal therapy Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-20 Qiuyu Luo, Yu Liu, Haotuo Liu, Xiaohu Wu
Titanium nitride (TiN) serves as an ideal reagent for photothermal therapy due to its cost-effectiveness, stability, and biocompatibility. This study investigates the optical and thermal properties of TiN nanoparticles in the near-infrared (NIR) region. Specifically, we employ the COMSOL Multiphysics software to solve Maxwell's equations using a finite element method, enabling us to investigate the
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Pore-scale investigation of transpiration cooling based on triply periodic minimal surface Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-20 Zhizhao Zhou, Yumei Lv, Fei He, Taolue Liu, Jianhua Wang
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Impact of variable properties in natural convection airflows within simple and adiabatically-extended vertical tubes Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-16 B. Zamora
Influence of variable thermophysical properties is investigated in airflows established by natural convection inside vertical tubes. Systematic numerical results are obtained for covering the entire range laminar to turbulent (modified Rayleigh number ranging –), for both isothermal and isoflux heating conditions. Particular attention is devoted to the effects of variable properties of air. Own functions
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Heat transfer and fluid flow performance of an internally longitudinal finned tube: Numerical study and experimental validation Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-16 Mahmoud S. El-Sebaey, Sh. Shams El-Din, Mohamed Kh. El-Kholy
The characteristics of heat transfer and fluid flow of an internally longitudinal finned tube were numerically studied. The results were validated with published experimental data, comparing the heat transfer coefficient and friction factor calculated in our numerical study with the corresponding values obtained from experimental data, with a highest deviation of . Exploring a novel hollow longitudinal
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Quantitative assessment and multi-objective optimization of supercritical CO2 cycles with multiple operating parameters Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-16 Xinzhuang Gu, Hao Chen, Shixiong Song, Wentao Xie, Yuda Chen, Teng Jia, Yanjun Dai, Raúl Navío Gilaberte, Bo Yu, Shuochen Zhou
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Effects of cross-sectional shape on flow and heat transfer of the laminar flow of supercritical carbon dioxide inside horizontal microchannels Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-16 Uday Manda, Sagnik Mazumdar, Yoav Peles
Supercritical carbon dioxide () flow at the micro scale provides an excellent heat transfer solutions for a range of microelectronics cooling applications. The cross-sectional shape of the microchannel (in combination with the abruptly changing thermophysical properties of ) affects the heat transfer and flow characteristics, but these effects are not well understood at constant wall temperatures as
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Influence of oscillation parameters on energy distributions and dynamic behaviors during laser welding of aluminum alloy T-joints assisted with solder patch Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-16 Yuewei Ai, Jiabao Liu, Chenglong Ye, Jian Cheng
The laser energy distribution on base material (BM) surface plays an important role in the welding quality. To reduce pore and spatter welding defects during laser welding of aluminum alloy T-joints, a circular shaped oscillating laser beam welding (OLBW) method for aluminum alloy T-joints assisted with solder patch is proposed in this paper. An energy distribution model and a dynamic model for OLBW
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Investigation of graphene-perovskite integration for enhanced absorption of solar thermal absorber for industrial heating applications Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-15 Dhruvik Agravat, Shobhit K. Patel, Osamah Alsalman
Advanced materials are critical for enhancing the efficiency of solar absorbers. Hence, the present study looks at the unique interaction between graphene and perovskite materials, a combination that has the potential to change the landscape of solar energy harvesting. The Graphene–Perovskite Integrated Solar Absorber (GPISA) structure harvests more than 98 % in UV and VIS regions ranging from 200 nm
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Estimation of the brain temperature during the hypothermia treatment of hypoxic ischemic encephalopathy in newborns Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-15 Felipe S. Nunes, Helcio R.B. Orlande, Andrzej J. Nowak
In this work, actual temperature measurements taken during the hypothermia treatment of the hypoxic-ischemic encephalopathy of a newborn are used for the solution of a state estimation problem. The objective is to sequentially estimate the newborn brain temperature during the local cooling treatment, by the application of the Sampling Importance Resampling (SIR) algorithm of the particle filter. A
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Experimental investigation on heat transfer characteristics of an annual jet flame in a pore-array spray gun Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-14 Jianxiao Lu, Shizhen Zhu, Yanbo Liu, Zhuang Ma
Oxyacetylene ablation is widely used to assess high-temperature thermal protection materials. This study investigated the heat transfer characteristics of an oxyacetylene spray gun structured with pore arrays for long-term ablation. The effects of oxyacetylene test parameters (Reynolds number (), equivalence ratio (), and ablation distance ()) on the flame shape and heat flux distribution were studied
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Investigation of heat transfer in cracked gun barrels Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-14 Yongda Zhang, Tao Xue, Xiaobing Zhang
Heat transfer process significantly affects the life span of gun barrels as it directly associates to the thermoelastic dynamic responses, erosion, and wears of gun barrels. The previous studies regarding the heat transfer in gun barrels were developed in the realm of that is expressed by partial differential equations with the condition of smoothly distributed physical fields, and have rarely studied
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Implicit lattice Boltzmann flux solver: A novel mesoscopic numerical algorithm for geothermal reservoir simulation Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-12 Peng Hong, Fuyan Zhao, Chuanshan Dai, Haiyan Lei
In this work, a novel implicit lattice Boltzmann flux solver (LBFS) for simulating geothermal reservoirs is developed. LBFS is a mesoscopic approach that uses the reconstructed lattice Boltzmann model to calculate fluxes on the cell interface, which has a more solid physics foundation. Compared with macroscopic methods that directly use mathematical approximations, the dynamic changes of pressure and
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Flow and heat transfer on the pressure side of C3X vane with various cooling hole blockages Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-12 Huwei Dai, Wenxin Dong, Xiaolei Liu, Peng Zhang, Xueling Zhang, Junhong Zhang, Jiewei Lin
Performance of film cooling under blockage has been extensively studied on flat plates. However, the ideal film cooling patterns obtained from flat plates may not be directly applicable to realistic engineering applications involving curved vanes or surfaces. The pressure gradient on a curved surface can significantly alter the behavior and trajectory of the coolant jet. This can result in variations
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Experimental study of R600a boiling in microfin tube Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-11 Zahraa Kareem Yasser, Mahmood Hasan Oudah
This paper presents experiments to investigate flow boiling and pressure gradients of R600a. The study employed microfin and smooth copper tubes simulating conditions in a domestic refrigerator, using low mass fluxes (MFs) and saturation temperatures (T). The test sections featured a tube length of (400 mm), an inner diameter of (4.3 mm), and an outer diameter of (5 mm). Test conditions varied, including
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Multi-tiered configurations improved flow boiling performance: Comparation investigation of leaf vein inspired two-tiered and three-tiered open microchannels Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-10 Qi Zhao, Jianhong Zhou, Mingxiang Lu, Xuemei Chen
Microchannel heat sinks with expanding flow area along with the flow direction are able to suppress flow instability and reduce pressure drop during two-phase flow boiling by offering broadening volume for bubble elongation and growth that suppress the slug blockage and flow reversal. In this regard, microchannels with expanding area perpendicular to flow direction are supposed to obtain the comparable
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3D modeling of cryogenic cracking by liquid nitrogen in coal under true triaxial stresses Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-10 Xinchuang Yan, Lei Wang, Songcai Han, Mian Umer Shafiq, Minsu Cha, Bowen Yao, Yu-Shu Wu
Coalbed methane (CBM) plays an indispensable role in total natural gas production and consumption, and for the bottlenecks encountered in stimulating CBM reservoirs by conventional fracturing methods, studying more environment-friendly and efficient stimulation methods is imperative. Cryogenic fracturing using liquid nitrogen has been trialed for the development of coalbed methane, demonstrating great
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Effect of pulsed coolant injection on unsteady film cooling characteristics with serrated trench design Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-10 Yang He, Ran Yao, Fei He, Liwei Ma, Jinfu Chen, Wei Song, Jian Pu, Jianhua Wang
To increase cooling effectiveness, film-hole designs with serrated trenches have been widely reported in the gas turbine industry. However, the unsteadiness level of the film coverage and the inevitable environmental pulsation are always neglected, which may lead to an unexpected failure of hot components by the instantaneous exposure to a high-temperature environment. In this work, a series of large
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Effect of SCWSP-VGs and thermal performance investigation of pillow-plate type heat exchanger (PPHX) Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-10 Ramesh Kumar
Vortex Generators (VGs) are an innovative heat transfer enhancement in traditional heat exchangers. With this technique, the study investigates the combined impact of upper-lower Staggered Circular Welding Spot Patterns (SCWSP) and VGs, termed SCWSP-VGs, in a periodic enhanced Pillow-plate type heat exchanger (PPHX) using ANSYS Fluent 18.1. Numerical results reveal SCWSP-VGs induce a periodic velocity
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Theoretical and experimental investigation of the startup characteristics of cryogenic loop heat pipes Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-08 Chenyang Zhao, Nanxi Li, Junting Li, Zhenhua Jiang, Yinong Wu
Cryogenic loop heat pipes (CLHPs) are widely used in satellites. To ensure the successful startup of a CLHP, the gas reservoir volume is typically designed to be 10 to 90 times larger than that of the CLHP itself. With the future miniaturization of satellites, it is crucial to reduce the total weight of the CLHP to lower the resources consumed on the thermal control subsystem. In this study, the relationship
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Numerical analysis of gravity-induced coupling dynamics of keyhole and molten pool in laser welding Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-08 Chao Ma, Yue Li, Lihong Cheng, Yanqiu Zhao, Jianfeng Wang, Xiaohong Zhan
The dynamics and flow behavior of the molten pool and keyhole during laser welding under the influence of lateral gravity engender a distinct propensity for fluctuation, thereby manifesting a substantial influence on the quality of the laser welding process. Nevertheless, a comprehensive elucidation of these intricately interconnected dynamic mechanisms across varying gravity angles still stands as
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Effect of injection angle on film cooling characteristics and loss mechanism of contracted double-jet hole in a flat plate Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-07 Ang Li, Guoqing Li, Jialin Liu, Nianqiang Li, Xingen Lu
With the inlet temperature of gas turbine continuously increases, film cooling is commonly used to protect the blades. However, the kidney vortex generated by the mixing between mainstream and film injection is negative to the film attachment, which deteriorates the film cooling characteristics. To solve the problem, a kind of contracted double-jet hole is introduced to form an anti-kidney vortex to
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Numerical simulation study on heat transfer characteristics of steam condensation in the presence of multi-component non-condensable gas outside the tube bundle Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-06 Xiang Peng, Jianfa Li, Xiaxin Cao, Haozhi Bian, Ming Ding
Under severe accident conditions, in addition to steam and air, there may also be hydrogen produced by the reaction of zirconium alloys and steam, CO produced by the molten corium concrete interaction (MCCI) and other gases in the containment. These gases, whose properties are quite different from air, can significantly affect the steam condensation process outside the tube bundle. This paper aims
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The investigation of the particle shape effect on the permeability of porous media through lattice Boltzmann simulation and experimental study Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-05 Huihui Song, Jiale Xie, Peijie Yin, Hongzhe Fu, Yue Zhang, Changgen Yan
In this paper, the influence of particle shape on the permeability of porous media is investigated through the lattice Boltzmann method (LBM). The accuracy of LBM is verified by comparing the theoretical solutions and the numerical results of face-centered cubic (FCC) arrays of spheres. The porous media consisting of ellipsoidal particles with different aspect ratios was generated by the Discrete Element
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Solar thermal absorber design using graphene-based aluminum resonator for industrial heaters Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-05 Shobhit K. Patel, Bo Bo Han, Osamah Alsalman
Solar thermal energy is one of the important sources of renewable energy. The solar thermal energy gives clean energy which can be utilized for industrial applications. Industrial heaters which require heat energy for many industrial uses can be attained using these solar thermal absorbers. The solar thermal absorber is designed using a layer design that consists of material compositions of Titanium
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Heat conduction characteristic of 3D nano-silicon thin films induced by ultrafast laser Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-05 Yudong Mao, Shouyu Liu, Mingzhi Yu, Binjian Chen, Jiying Liu, Kaimin Yang
In this study, the lattice Boltzmann method was utilized to explore the heat conduction characteristic of 3D nano-silicon thin films subjected to ultrafast laser irradiation. The impacts of boundary conditions and size effects of the film on heat conduction are analyzed. We found that under the high power of the ultrafast laser exposure, the thin film's heat conduction exhibits marked directionality
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Heat transfer and behavior of ultra high temperature ceramic materials under exposure to supersonic carbon dioxide plasma with additional laser irradiation Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-04 A. Chaplygin, E. Simonenko, N. Simonenko, M. Kotov, M. Yakimov, I. Lukomskii, S. Galkin, A. Kolesnikov, S. Vasil’evskii, A. Shemyakin, N. Solovyov
The behavior of the ultra high temperature ceramic material HfB-SiC-C(graphene) under exposure to a supersonic carbon dioxide plasma, with and without the addition of laser irradiation, has been studied. The material was heated to 1750 °C in an inductively coupled plasma jet without laser irradiation. A temperature jump to 2190 °C was observed when additional ytterbium laser irradiation was applied
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Simulation study on thermal effect of ceramic materials rapidly and remotely heated by a flat-top CW laser Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-04 Zhenhua Lei, Pinghui Wu, Hao Chen, Zao Yi, Yao Long, Zhefeng Yu, Mengsi Liu, Bin Tang, Jiaquan Yan, Gongfa Li
Compared with other heating methods, laser heating has outstanding advantages and application prospects in the field of high-power, large-area, remote and continuous heating of ceramic materials. However, the physical phenomena and mechanisms involved in the heating process are difficult to explain experimentally. This problem is solved by simulating the process of the heating experiment. In this study
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2D temperature tomography of a flame, based on VIS-NIR spectrometry Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-04 Milos Mosic, Edib Dobardzic, Milos Vicic, Becko Kasalica, Mirjana Sarvan, Ivan Belca
This research presents a new approach for reconstructing two-dimensional temperature distribution in the firebox of a commercial coal power plant. The method involves measuring the temperature field distribution using four optical probes connected via fiber optic cables with spectrometers. The iterated Tikhonov method with a Bayesian framework was used for solving the ill-posed inverse problem. This
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Effectiveness of photothermal therapy using various noble-metal photothermal agents Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-02 Donghyuk Kim, Hyunjung Kim
Nanosized materials are used in various industries, depending on their production form. In the medical field, nanosized particles are used for treatment. Among various treatment techniques, photothermal therapy (PTT) uses nanoparticles as photothermal agents (PTAs). In this study, the effectiveness of PTT using noble-metal PTAs with various materials and radii was analyzed using numerical analysis
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Estimation of tool temperature during laser-ultrasonic elliptical vibration turning high volume fraction SiCp/Al composites Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-03-01 Peicheng Peng, Daohui Xiang, Zhaojie Yuan, Zhiqiang Zhang, Chaosheng Song, Guofu Gao, Xiaobin Cui, Bo Zhao
High volume fraction SiCp/Al composite materials have excellent material properties. Therefore, it is mainly used in aerospace equipment, precision guided weapons, electronic packaging and other fields. However, when machining it with large hardness using traditional methods (TM), tool wear is severe, and processing efficiency is low. At the same time, the thermal softening characteristics of laser
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A study of vortex generator effects on fan-shaped hole cooling performance Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-29 Haichao Wang, Huayu Guo, Guoqin Zhao, Yumeng Li, Cunliang Liu
To improve film cooling performance, many shaped holes have been developed. Among them, laidback fan-shaped hole is widely applied. Expansion at the outlet increases cooling effectiveness (η) greatly but decreases jet inertia. Facing crossflow, it may reduce η instead. Therefore, a chevron structure was added to the expansion part to improve the jet inertia. Its effects were studied by PSP experiments
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Heat transfer and fluid dynamics of a single jet impingement – An experimental and numerical approach Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-29 Flavia V. Barbosa, Senhorinha F.F.C. Teixeira, José C.F. Teixeira
Jet impingement is a complex flow governed by several variables; therefore, it is important to perform an in-depth study to understand their influence on heat transfer efficiency. This work uses a Particle Image Velocimetry technique and a heat flux sensor to study the flow field of a jet impinging a flat plate. To provide more data that complement the experimental approach, a numerical model of an
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Experimental investigation for the loop heat pipe with a bifacial flat evaporator Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-29 Tingting Wang, Jing Zhao, Wei Liu, Lei Ma, Zhichun Liu
To improve dual heat source cooling in a compact space, we designed a dual wick flat-type LHP with a bifacial evaporator, analyzed the evaporator's heat transfer process, and determined the impact of side-wall and backward conduction on system operation. To reduce side-wall conduction, the proposed LHP system uses a composite evaporator with a copper heating surface and a stainless steel shell. We
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Graphene-based solar absorber structure using GaAs-Al-Zr materials for renewable energy application Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-29 Osamah Alsalman, Bo Bo Han, Shobhit K. Patel
Industrial heating applications required renewable energy-based solutions to meet his high demands. The recent design exhibition is a three-layer type solar absorber with an effective graphene compilation; Gallium Arsenide (GaAs) in the top (resonator), Aluminium (Al) in the middle (substrate), and Zirconium (Zr) in the ground (based) layer respectively. To show the extinct variation analysis for the
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Effect of pin electrodes on flow boiling heat transfer and bubble dynamic behaviors in vertical minichannels Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-29 Jinxin Zhang, Xiaoping Luo, Zhenfei Feng
Electrohydrodynamic can significantly improve flow boiling heat transfer. However, pin electrode configuration has not been investigated comprehensively. This study explores the flow boiling performance of vertical minichannels in non-uniform electric field formed by pin electrode. The influences of pin electrode spacing and array region on flow pattern and heat transfer under electric field are studied
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Experiment and numerical study on thermal performance of counterflow wet cooling tower filled with double S-wave packing Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-28 Lu Yang, Lin Zhang, Jiuru Hu, Yong Li, Jiamei Fang, Zhikang Yu, Weigang Xu, Kexin Dong, Wenxin Qian, Herong Zhang
The packing is the core heat transfer unit in the cooling tower. To improve the heat and mass transfer performance of the counterflow wet cooling tower, a new double S-wave structure packing is proposed in this paper, and its performance in heat-mass exchange is investigated using a combination of numerical simulation and experiment. The flow heat transfer performance of the double S-wave packing with
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Study on the flow characteristics of microscale copper inverse opal wick structures Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-28 Yongjia Wu, Dongcheng Liu, Hanbing Xiong, Zhiyong Li, Donghao Zhao, Congcong Zhi, Jianlong Wan, Tingzhen Ming
Ultra-thin heat pipes are extensively used to address heat dissipation challenges in compact electronic devices with limited space. Research on new types of micro-porous wick is crucial for enhancing the heat transfer of ultra-thin heat pipes. The hydraulic transport properties of micro-porous wick structures are crucial factors for the applications. The inverse opal (IO) micro-porous metal structure
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Gas-solid coupling in a randomly distributed ceramic nanofibrous aerogel Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-28 Peter-Ebuka Okafor, Guihua Tang
Ceramic nanofibrous aerogel (CNA) has received tremendous interest recently due to its advantageous properties and potential applications. However, modeling its gas-contributed thermal conductivity is quite difficult due to the intricate gas-solid coupling heat transfer mechanism and complex structure. Herein, based on an equivalent method used for a gas in free space, a model for predicting gas-contributed
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Analysis of laser surface absorptivity modification for selective laser hardening Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-28 Zdeněk Veselý, Petra Honnerová, Matěj Hruška, Lucie Nedvědová, Milan Honner
Laser hardening is a thermal process that improves the surface mechanical properties of metallic materials. Efficiency enhancement of the thermal process of laser hardening is a long-term challenge. The article develops an approach called selective laser hardening that utilizes an absorptivity modification of the surface areas of the part to be processed by laser hardening. Laser surface treatment
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Numerical study on the effect of multi-hole injector on three-dimensional flow and heat transfer properties of a novel combined solid rocket motor Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-28 Zhengchun Chen, Limin Wang, Shuyuan Liu, Jie Wang, Zhixun Xia, Songqi Hu
The injection mode of oxidizer gas significantly affects the flow and heat transfer characteristics of rocket motors with separated oxidizer and fuel propellants. In the present study, the effect of the multi-hole injector on flow and heat transfer of a novel combined rocket motor is studied with a three-dimensional numerical model. The results show that as the number of injection holes increases from
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Numerical investigation of longitudinal location and heat release rate of fire source on neutral plane height and induced flow in longitudinal sloping tunnel fires under natural ventilation Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-27 Zhuyu Shao, Yi Li, Haihao Cui, Binshan Yu, Haiyong Cong
This study investigates numerically the impact of the longitudinal location as well as the heat release rate (HRR) of the fire source on the neutral plane and induced flow within a longitudinal sloping tunnel under natural ventilation. Research shows that neutral plane height in longitudinal sloping tunnels is mainly influenced by the longitudinal location of the fire source and the longitudinal slope
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Visualizing heat-convection using laser spot step heating thermography Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-26 A. Bedoya, J.B. Rojas-Trigos, J. Hernández-Wong, A. Calderón, E. Marín
This paper introduces a novel application of laser spot step heating thermography, namely the visualization of a convective phenomenon. A fluid confined in a measurement cell is in intimate contact with the inner face of a thin vertical metallic sheet, on whose external surface a laser beam is tightly focused generating heat that diffuses to the closest part of the fluid layer adjacent to the sample
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Numerical investigations on the droplet moving in steam with non-condensable gas by lattice Boltzmann method Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-24 Yue Li, Linrong Ye, Mingjun Wang, Wenxi Tian, Suizheng Qiu, G.H. Su
Spray cooling is an efficient cooling technology with high heat dissipation, and has been extensively utilized in various industry areas. The interaction mechanism between the spray droplet and environmental space with high pressure and temperature is extremely complex, especially with non-condensable gas. In this paper, a pseudopotential multicomponent multiphase lattice Boltzmann model for droplet
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Experimental study on the smoke diffusion length affected by canyon winds in the open section of railway tunnel groups Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-22 Xin Chen, Li Yu, Jianxun Huo, Xue Wang, Songshen Wang, Xiaohan Guo, Mingnian Wang
There are numerous tunnel groups, referring to multiple tunnels spaced a certain length apart. When a fire occurred in a railway tunnel group, the train should brake out of tunnel portal to evacuate passengers. However, tunnel groups are usually located in canyon areas, where the canyon winds are common, and the canyon wind would have a significant effect on the diffusion of fire smoke in the open
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Development of novel thermal diode based on improved check valve and modified wick structure Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-22 Jianhua Xiang, Junguang Liu, Wenqiang Yang, Xin Wei, Ping Li, Zhipeng Chen, Yongfeng Zheng, Jiale Huang
Heat pipes are widely used in thermal management due to their high heat transfer coefficient. However, traditional heat pipes conduct heat bidirectionally, depending on the temperature at both ends of the pipe. This can lead to the transfer of external heat back into the system at high ambient temperatures, reducing system performance and potentially damaging devices. To overcome this drawback, a thermal
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Triangular pyramid nanostructure enhanced photothermal utilization of noble metal nanoparticles Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-22 Xiaowen Chen, Caiyan Qin, Liu Yang, Xiaoke Li, Xiaohu Wu, Bin Zhang
The triangular pyramid nanostructure (TPN) raises a perfect prerequisite for the aggregation of surface plasmon resonances (SPRs). However, the application of TPN in thermoplasmonics has not yet been developed. The aim of this study is to explore the development potential of TPNs for enhanced noble metal photothermal applications. We investigated the optical absorption properties, photothermal conversion
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A laboratory-made flash apparatus to simultaneously estimate the thermal properties of three building materials Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-21 Saad Raefat, Mohammed Garoum, Najma Laaroussi, Mohamed Ouakarrouch
Determination of thermophysical properties of construction materials such as λ, C and a, is essential to assess their thermal behavior in buildings. To measure these properties, several highly sensitive techniques exist. However, in addition to the length of time required, it remains difficult to make separate measurements in the same conditions of temperature, humidity, and sampling. In this paper
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Investigation of film cooling performance of the V-shaped cratered diffusion hole on the guide shield of the exhaust system Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-20 Qingqing Shi, Li Zhang, Cunliang Liu, Hao Chen, Jie Zhang, Jingyin Shi
The guide shield is positioned on the exterior of the bearing strut of the turbine rear frame, serving the dual purpose of insulating from hot gas and providing rectification. However, the guide shield still faces the severe risk of the external high-temperature environment for the advanced aero-engine. The conventional cylindrical hole exhibits inadequate spanwise cooling performance. To enhance film
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Calculation method for the radiation view factor from horizontal tubular microalgae photobioreactor plants to the sky Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-20 Heyu Zhang, Gege Liu, Jing Wu
The ability to calculate the radiation view factor from a tubular microalgae photobioreactor plant to the sky is needed to accurately predict the broth temperature in it, because the calculation of diffuse solar radiation in a heat transfer model for determining the broth temperature requires the view factor. A calculus-based method has been proposed previously for calculating the view factor that
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Broadband absorption in nanostructured cross-shaped metamaterial for visible and infrared wavelengths Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-20 Ammar Armghan, Muhammad Mehran Bashir, Khaled Aliqab, Meshari Alsharari
The successful implementation of broadband, ultrathin and highly efficient nanostructured plasmonic absorbers is difficult to realize. The performance of the nanoscale metamaterial absorbers is severely restricted due to the multilayer design architecture and difficult fabrication process. So herein a simple and plain nano cross-shaped ring of nickel metal is exploited as a broadband absorber for visible
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Reynolds analogy violation for a compressible turbulent boundary layer with pressure gradient in a small-size supersonic slot channel Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-19 N.A. Kiselev, N.S. Malastowski, A.G. Zditovets, Yu.A. Vinogradov
Skin friction and heat transfer in compressible gas flow in a small supersonic slot channel were investigated. Experimental results describe the influence of weak and moderate non-equilibrium adverse pressure gradient (APG) on the skin friction and heat transfer St coefficients, the Reynolds analogy factor 2St and the temperature recovery factor . The pressure gradient value was controlled by the divergence
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Heat transfer enhancement and long-term test of non-ionic Triton surfactant with different hydrophilic chain lengths Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-17 Jielin Luo, Hongxing Yang, Tao Wen
Surfactant aids boiling enhancement, but the related mechanism is not yet comprehensively understood. For mechanism investigation on surfactant molecule, most of existing studies focused on its hydrophobic part, while research on hydrophilic part is scarce. In this paper, a group of non-ionic Triton surfactants with same functional group but different hydrophilic chain lengths were experimentally tested
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Tree waste based advanced thermal insulation – Vacuum insulation panels – For application at up to 70 °C Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-17 Tarek Raad, Sankarshan Verma, Harjit Singh
Vacuum Insulation Panels (VIPs), despite being the best performing thermal insulation, face the challenges of high cost and environmental concerns associated with the core material, which typically consists of fumed silica (FS) or glass fibres. This study experimentally assessed the suitability of two novel core materials, which were generated from waste tree-based natural fibres (TNF), as potential
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Linear stability analysis of micropolar fluid in a vertical channel Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-17 D Srinivasacharya, Pankaj Barman
The objective of this investigation is to examine the stability of the mixed convection flow of micropolar fluid in a vertical channel. The analytical solutions for the basic velocity, microrotation, and temperature are achieved by assuming the flow is steady, unidirectional, and fully developed. The differential equations for the perturbed state are obtained by introducing minor disturbances to the