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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
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Heuristic optimality criterion algorithm for topology optimization of conjugate heat transfer problem Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-15 Zhilin Hu, Huahai Zhang, Juan Wang, Limin Wang
A new heuristic algorithm is proposed for optimizing the topology of conjugate heat transfer structures, effectively reducing average temperatures in steady state. This algorithm used the thermal lattice Boltzmann method (TLBM) to simulate the conjugate heat transfer of 2D steady state, and used the weighted sum method to deal with the two-objective optimization problem between heat transfer and pressure
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The effects of single-point extraction on smoke diffusion length and ceiling temperature distribution in a tunnel with one closed end Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-15 Shengzhong Zhao, Junhao Yu, Liu Xu, Tiantian Xu, Fei Wang, Imad Obadi, Lin Xu, Wenjun Lei
Previous studies on ventilated tunnel fires mainly focused on both open-end tunnels and longitudinal ventilation. There is still a lack of in-depth research on the effects of single-point extraction on smoke characteristics in tunnel fires with one closed end. In this paper, the effects of heat release rate, smoke vent location, and exhaust volume on smoke diffusion length, maximum ceiling temperature
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Effects of geometry on the thermal-fluid dynamics of a transition water flow in a square heated asymmetric cavity channel Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-15 Damiano Auliano, Manuel Auliano, Erling Næss
Cavity channels candidate as a promising passive cooling configuration in thermal management. The superior performance and the limited scientific investigation regarding cavity channels dictate the need for better understanding of the thermal-fluid dynamics. To the best knowledge of the authors, there are few works investigating the effect of the geometry on the thermal-fluid dynamics of cavity channels
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Numerical simulation of homogeneous-heterogeneous condensation and interphase heat transfer in a dusty vapour-gas flow: Controlling the homogeneous condensation process Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-13 N.M. Kortsensteyn, V.Y. Levashov, A.K. Yastrebov, L.V. Petrov
The effect of heterogeneous condensation centres (dust particles) on the bulk condensation process was studied using numerical simulations. The possibility of controlling the process of homogeneous condensation by injecting dust particles into the flow of vapour-gas mixture is shown. A homogeneous-heterogeneous bulk condensation model was used based on two groups of droplets in the flow: microdroplets
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Study on the multi-field coupling behavior of C/SiC composites under the combined action of the local extreme heat source and hypersonic airflow Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-13 Junru Wang, Weihua Xie, Dong Yu, Bo Gao, Fan Yang, Sen Liu, Songhe Meng
In this study, the CW laser is used as a local heat source to simulate the extreme thermal environment generated by shock wave interference at discontinuities in spacecraft. The ablation behavior of the thermal protection material (C/SiC) is investigated under the combined impact of high-temperature airflow and the local extreme heat source. A novel multi-field coupling numerical computation software
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Professor Sameer Khandekar - Obituary Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-13 Committee on Joint International Heat Pipe Conferences & Symposia, Jocelyn Bonjour, Yury Maydanik, Manfred Groll, International Journal of Thermal Science, Chakravarthy Balaji, Cathy Castelain
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Experimental investigation on temperature-dependent effective thermal conductivity of ceramic fiber felt Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-12 Fei Wang, Yinan Wang, Chuang Sun, Pei Zhang, Xinlin Xia
This paper presents a method to invert the effective thermal conductivity of ceramic fiber felt under high temperatures using experimentally measured specific heat capacity, density, and transient temperature data. The method combines the solution of the heat transfer equation with an inversion method based on real-valued genetic algorithm (GA) optimization, and 11 target parameters can be simultaneously
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Numerical simulation of hydrodynamically and thermally developing mixed convection in a metal foam-filled elliptic annulus Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-09 I. Boukhalfa, M. Afrid, D. Groulx
In this study, results of a numerical simulation of the 3D laminar mixed convection in an annulus between two confocal elliptic cylinders are presented. The inner cylinder is heated with a constant heat flux, and the outer cylinder is adiabatic. The annulus is filled with isotropic and homogenous metal foam. This system is used to heat a water flow that is axial, uniform and isothermal at the annulus
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Coupled atomistic–continuum simulations of nucleate boiling Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-08 Gabriele Gennari, Edward R. Smith, Gavin J. Pringle, Mirco Magnini
Boiling is a striking example of a multiscale process, where the dynamics of bubbles is governed by the interplay between the molecular interactions responsible for nucleation, and the macroscale hydrodynamic and thermal boundary layers. A complete description of this phenomenon requires coupling molecular- and continuum-scale fluid mechanics into a single modelling framework. This article presents
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Laminated cooling on center cone in an integrated afterburner Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-08 Kecai Cai, Chunhua Wang, Xiaonan Ge, Shun Xu, Jingzhou Zhang
As a key component in an integrated afterburner, the center cone plays a crucial role in reducing flow loss and increasing flame stabilization. A numerical analysis was performed to study the laminated cooling of the center cone under real engine operating conditions. The impact of both thermodynamic and geometric factors on the cooling efficiency of the cone is thoroughly investigated. The precision
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Representation of 3D phenomena of laminar flow and heat transfer in a helically coiled tube using a 2D geometry Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-08 Nilo Henrique Meira Fortes, Artemio Plana-Fattori, Jorge Andrey Wilhelms Gut
The coiled tube geometry has different industrial applications whereby heating and cooling operations are required. In this work, a 2D semi-empirical model based on a straight tube is proposed to represent the 3D phenomena of flow and heat transfer in a coiled tube. The model considers a modified velocity profile based on residence time distribution (RTD) experiments and a heat transfer enhancement
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Tunable narrowband and diffuse metasurface thermal emitters based on doped semiconductors Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-08 J.M. Xu, R.B. Su, Z. Gong, C.Y. Zhao, B.X. Wang
Narrowband and diffuse thermal emitters are promising in applications like infrared gas sensing and thermophotovoltaics. However, current designs for narrowband and diffuse thermal emitters are typically limited to narrow wavelength ranges and cannot be broadly tuned. In this work, we propose a two-dimensional metasurface emitter that demonstrates a narrowband and diffuse emissivity profile, whose
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Cooling performance of sliver solar cells in low concentration PV system with ribbed-groove mini-channel heat sink Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-07 Milad Sadinezhad Fard, Masoume Rahimi, Younes Pahamli, Hamid Samadi, Rasool Bahrampoury
This paper presents a numerical investigation of a cooling system designed for concentrated photovoltaic (PV) systems. To enhance the performance of system and reduce operating temperature, mini-channels have been integrated onto the PV cells. Heat transfer improvement in these mini-channels is proposed by integrating ribbed grooves in a parallel alignment on their sidewalls. Water is used as a cooling
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Dimensionless numerical sensitivity analysis of narrow cracks by means of infrared lock-in thermography Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-06 David Sagarduy-Marcos, Javier Rodríguez-Aseguinolaza
The non-destructive detection of defects in materials, such as cracks, delaminations and others, is a critical issue to be addressed in many technological applications like automotive, aeronautical or aerospace industries. In this frame, lock-in infrared thermography is identified as a highly suitable solution offering not only a qualitative detection of the defects but also their quantitative characterization
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A transient thermal model for forecasting the real-time temperature of downhole electronics Int. J. Therm. Sci. (IF 4.5) Pub Date : 2024-02-06 Fulong Wei, Wei Lan, Chao Deng, Jiale Peng, Xiaobing Luo
Logging tools are essential for high-temperature downhole oil exploration. Passive thermal management has been widely used to ensure the normal operation of downhole electronics. A key requirement for passive thermal management is the quick on-site prediction of real-time logging tool temperature. This is challenging due to variable downhole environments, initial temperature distributions, and power