Article
Thermodynamics
Shwin-Chung Wong, Mao-Shen Deng
Summary: Two types of novel triple composite mesh-groove-powder wicks were proposed and tested in a flat-plate heat pipe. The results showed that the powders in the mesh-groove evaporator increased flow resistance and caused partial dry-out in some grooves at high heat loads, but the powder-only evaporator improved the heat load.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Taoufik Brahim, Abdelmajid Jemni
Summary: This study numerically investigates a three-dimensional FHP with multi heat sources using COMSOL Multiphysics, exploring the potential use of copper metal foam as a wick structure. Results show that copper metal foam can be an alternative wick for FHPs, but the impact of factors such as hotspot positions, dimensions, and distances on heat pipe operation needs to be considered.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Chemical
Bing Cai, Weizhong Deng, Tong Wu, Tingting Wang, Zhengyuan Ma, Wei Liu, Lei Ma, Zhichun Liu
Summary: This study explores the influence of using a pouring silicate wick on the production and performance of loop heat pipes. The results show that the system can operate stably, adapt well to changes in heat load, and have good heat load matching capabilities.
Article
Thermodynamics
Shwin-Chung Wong, Mao-Shen Deng, Min-Chieh Liu
Summary: This study investigates the capillary properties of a flat-plate heat pipe with a sintered composite copper mesh-groove wick and proposes a new formula for calculating its permeability. The experimental results show that the composite mesh-groove wick has a higher maximum heat load compared to another commonly used wick.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Fitri H. S. Ginting, Anggito P. Tetuko, Nining S. Asri, Lukman F. Nurdiyansah, Eko A. Setiadi, Syahrul Humaidi, Perdamean Sebayang
Summary: In this study, two metal foams (stainless steel) were modified into superhydrophilic and superhydrophobic surfaces through treatment and cleaning. The surface modifications were achieved using acetone cleaning and superhydrophobic coating methods. The morphology, physical properties, wettability, and capillary behavior of the metal foams were analyzed. The superhydrophilic metal foam was selected as the wick structure in a cylindrical heat pipe, where ferrofluid was used as the working liquid. The performance test of the heat pipe showed that the optimum thermal resistance was 2.47 degrees C/W at a heat input of 5 W.
SURFACES AND INTERFACES
(2023)
Article
Thermodynamics
Zikang Zhang, Runze Zhao, Zhichun Liu, Wei Liu
Summary: Loop heat pipe, utilizing a biporous wick, exhibits improved performance compared to traditional monoporous wicks. The driving forces for loop circulation include capillary force, phase-change driving force, and gravity force. Experimental results show that under horizontal conditions, the loop can transfer a maximum heat load of 110 W with a minimum thermal resistance of 0.382 degrees C/W.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Zhengang Zhao, Guohong Peng, Yanhui Zhang, Dacheng Zhang
Summary: In this paper, a novel sintered multi-size copper powder wick is designed and experimentally investigated for heat flux management. The results show that the new wick has shorter liquid transfer time, faster dynamic response time, and lower overall thermal resistance compared to single-size copper powder wicks.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Zhuo Cui, Li Jia, Zhou Wang, Chao Dang, Liaofei Yin
Summary: This paper presents an ultra-thin flat heat pipe (UTFHP) with small thickness and high thermal performance for the thermal management of high-performance electronic devices. The effects of fill ratio, mesh number, and passage width on the thermal resistance and temperature distribution of UTFHPs are analyzed, and the optimal thermal performance is achieved under specific conditions.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Hao Guo, Xianbing Ji, Yuanyuan Gan, Jinliang Xu
Summary: Particle morphology and wettability of porous wick have significant effects on the heat transfer performance of loop heat pipes (LHPs). The capillary performance of dendritic particle wick is better than that of spherical particle wick, and superhydrophilic wick has a higher climbing height compared to hydrophilic wick. The particle morphology also affects the uniformity of the working fluid distribution and the operating temperature of LHPs.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Hainan Zhang, Yaling Tian, Changqing Tian, Zhiqiang Zhai
Summary: In this paper, a compact flat-evaporator loop heat pipe is designed and the effects of key structural parameters and working conditions on its dynamic and steady-state performance are studied. The results show that increasing heat load or the filling ratio, arranging vapor channels in the middle of the wick (rather than at the bottom) or lengthening the condenser can all reduce the temperature fluctuation; A small inclination angle of 5° and 10° can reduce the temperature fluctuation and the stable temperature, while large inclination angle of 15° will instead bring higher stable temperature; When the heat load increases step by step, the stable temperature (average temperature for fluctuation conditions) decreases and then increases for all filling ratios and structures; Minimized thermal resistance is achieved by optimizing wick and condenser structure under low and high heat load, respectively.
Article
Thermodynamics
Prem Kumar, Mayur Gachake, Sameer Khandekar
Summary: The study focuses on reducing heat leak in loop heat pipes (LHP) by manipulating the properties of the copper wick, leading to improved thermal performance. It was found that the oxidized copper wick performs better thermally than the pure copper wick, attributed to the lower thermal conductivity of the oxidized porous wick reducing heat leak.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Suttida Maneemuang, Niti Kammuang-Lue, Pradit Terdtoon, Phrut Sakulchangsatjatai
Summary: The study investigated the effect of pipe flattening on pressure drop and heat transfer characteristics of heat pipes. It was found that flattening the heat pipe resulted in increased pressure drop and reduced vapor core space, hindering heat transfer. Flattening the heat pipe caused the vapor core area to approach zero, leading to a high value of thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Multidisciplinary
Jia-Li Luo, Dong-Chuan Mo, Ya-Qiao Wang, Shu-Shen Lyu
Summary: The challenge of heat dissipation in electronic devices is being addressed by using ultrathin heat pipes, with this study proposing a biomimetic copper forest wick for improved performance. Tests showed the new wick structure had higher capillary performance and effective thermal conductivity compared to traditional methods, resulting in a more efficient heat dissipation system for electronic devices.
Article
Chemistry, Multidisciplinary
Yanhui Zhang, Zhengang Zhao, Chuan Luo, Dacheng Zhang
Summary: The study focused on improving the thermal efficiency of Flat-plate Micro Heat Pipe (FMHP) by studying the impact of wick structure and wettability, resulting in the development of Composite Wick FMHP (CW-FMHP) and Oxidized Composite Wick FMHP (OCW-FMHP). Experimental results showed that CW-FMHP achieved optimal thermal transfer performance at a liquid filling rate of 150%, while OCW-FMHP had higher maximum thermal power and lower thermal resistance compared to CW-FMHP.
Article
Thermodynamics
Salar Saadatian, Harris Wong
Summary: This study investigates the thermal conduction performance of a horizontal flat heat pipe with an ideal porous wick. Mathematical models were used to analyze the evaporation rate, heat conduction rate, and liquid-vapor flow in the heat pipe. The effects of pipe length and wick thickness on the heat conduction performance were analyzed, providing guidelines for the design of flat heat pipes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Jia-Qi Guo, Ming-Jia Li, Jin-Liang Xu, Jun-Jie Yan, Teng Ma
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Thermodynamics
Jian Xie, Qingting She, Jinliang Xu, Cong Liang, Wenxiao Li
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Chemistry, Multidisciplinary
Yang Shen, Yongpan Cheng, Jinliang Xu, Kai Zhang, Yi Sui
Article
Thermodynamics
Mingjia Li, Ge Wang, Jinliang Xu, Jingwei Ni, Enhui Sun
Summary: The benefits of large-scale supercritical CO2 coal-fired power plants are analyzed and compared with ultra-supercritical water-steam Rankine cycle coal-fired power plants in terms of energy environment and economy. The results show that the S-CO2 coal-fired power generation system outperforms the USC coal-fired power generation system in terms of energy consumption, resource depletion, environmental impact, and investment cost.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Thermodynamics
Haisong Zhang, Jinliang Xu, Xinjie Zhu, Jian Xie, Mingjia Li, Bingguo Zhu
Summary: This paper investigates the relationship between pressure drop and heat transfer in supercritical carbon dioxide (sCO(2)), introducing the concept of pseudo-boiling to characterize the flow and heat transfer in the supercritical domain. Different regimes of heat transfer behavior and pressure drops are identified, with a new correlation for friction factors developed to better predict the results in sCO(2) systems.
APPLIED THERMAL ENGINEERING
(2021)
Editorial Material
Thermodynamics
Jinliang Xu, Noam Lior, Mingjia Li, Zheng Miao
Article
Thermodynamics
Chao Liu, Jinliang Xu, Mingjia Li, Zhaofu Wang, Zeyu Xu, Jian Xie
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Physics, Multidisciplinary
Guanglin Liu, Qingyang Wang, Jinliang Xu, Zheng Miao
Summary: The study focuses on the subcritical saturated organic Rankine cycle system with four different organic working fluids at various heat source temperatures. It concludes that the efficiency of the two-stage system is affected by the choice of organic working fluids and is higher than that of a single-stage system.
Article
Thermodynamics
Xiongjiang Yu, Jinliang Xu, Guohua Liu, Xianbing Ji
Summary: A new concept of phase-separation evaporator is proposed in this study, where flow instabilities can be suppressed by using gradient pinfin-porous wall microchannels. The high-frequency release of vapor bubbles and stable heat transfer in bare channels enable stable heat transfer under different operating parameters.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Chunlei Cao, Xiaojing Ma, Xiaotian He, Jinliang Xu, Jian Xie, Guohua Liu
Summary: The study demonstrates that using a soft surface can significantly enhance boiling heat transfer efficiency, especially under saturated boiling conditions. The soft surface can reduce bubble departure size and increase departure frequency, thereby lowering the wall superheating temperature. The formation of elastocapillary waves and dynamic wrinkles can improve heat transfer effect by disturbing the near-wall boundary layer.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Enhui Sun, Jinliang Xu, Mingjia Li, Hangning Li, Chao Liu, Jian Xie
ENERGY CONVERSION AND MANAGEMENT-X
(2020)
Article
Chemistry, Multidisciplinary
Guihua Tang, Dong Niu, Lin Guo, Jinliang Xu
Article
Thermodynamics
Bingguo Zhu, Jinliang Xu, Haisong Zhang, Jian Xie, Mingjia Li
APPLIED THERMAL ENGINEERING
(2020)
Review
Thermodynamics
Hao Guo, Xianbing Ji, Jinliang Xu
FRONTIERS IN HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Longyan Zhang, Jinliang Xu, Guangling Liu, Junpeng Lei
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2020)
Article
Thermodynamics
Cong Li, Jiali Wang, Chenhui Wang, Yanke Jin, Yina Yao, Rui Yang
Summary: This study investigates the impact of NaCl water droplets with various concentrations on a heated surface. The results show that the impact patterns can be categorized into different types, and models are established to predict the spreading behavior of droplets with different concentrations. Additionally, high concentration droplets exhibit more violent boiling and have lower residual energy and rebound time.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
C. Barrera, V. Castro, F. Escudero, J. J. Cruz, I. Verdugo, J. Yon, A. Fuentes
Summary: This study focuses on the characterization of soot maturity and sooting propensity of anisole fuel in a controlled laminar coflow diffusion flame. The results show that the spatial distribution of soot volume fraction is enhanced near the flame centerline, while soot production is promoted near the flame wings. The temperature increase also affects the maturity of soot particles.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Roman W. Morse, Jason Chan, Tiago A. Moreira, Jared J. Valois, Evan T. Hurlburt, Jean-Marie Le Corre, Arganthael Berson, Kristofer M. Dressler, Gregory F. Nellis
Summary: This study investigates the dryout of liquid film and the role of disturbance wave frequency. Experimental results indicate that the heat transfer coefficient associated with optimal boiling conditions is maximized when the surface is dry 5% of the time, independent of pulse amplitude and frequency. Liquid-film measurements, dryout statistics, and direct observation suggest that disturbance-wave frequency can be manipulated by density-wave oscillations in the flow field.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
E. J. Vega, J. M. Montanero
Summary: In this study, we experimentally investigated the bursting of a bubble covered with a surfactant. We found that the bubble bursting time is longer compared to a surfactant-free bubble due to interfacial elasticity. Furthermore, the Marangoni stress drives liquid flow that allows the jet to escape from the end-pinching mechanism within a certain surfactant concentration range.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Guofu Sun, Yi Zhan, Tomio Okawa, Mitsuhiro Aoyagi, Akihiro Uchibori, Yasushi Okano
Summary: Experiments were conducted on liquid jets ejected from oval nozzles to investigate the effects of nozzle orifice shape on jet behavior. The study found that the liquid jet exhibited different characteristics at different liquid flow rates. Correlations were established to predict the liquid jet state and characteristics of the secondary droplets produced during jet impact onto a solid surface. This research extended the available knowledge on liquid jet behavior.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Jeonghoon Lee, Laurent Zimmer, Takeshi Saito, Shinji Nakaya, Mitsuhiro Tsue
Summary: This study investigates the effects of spatial resolution on DMD amplitudes and spatial mode strengths, and proposes scaling factors to correct for the resolution differences. The results show that the proposed scaling factors successfully normalize the amplitudes and spatial modes, allowing for quantitative comparison of data obtained with different spatial resolutions. This study is significant for analyzing spatiotemporal data in various fields.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Yanli Zhao, Shibing Kuang, Xiaoliang Zhang, Mingjun Xu
Summary: This study experimentally investigates the dynamic process of water droplet impacting different wood surfaces and analyzes and discusses the impacting phenomena, phenomena distribution, droplet spreading dynamics, and maximum spread factor. The results show that the impacting process can be distinguished by Weber numbers and Reynolds numbers, and can be predicted by mathematical expressions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Aakhash Sundaresan, Atul Srivastava, Callum Atkinson
Summary: This study presents the first-ever application of an advanced methodology, combining two-color laser-induced phosphorescence and particle image velocimetry, to investigate the heat transfer mechanisms on the surface of a cylinder placed inside a confined square duct. The technique allows for simultaneous measurement of velocity and temperature fields, reducing the complexity and costs associated with separately measuring temperature distributions. Experimental observations show that increasing the mass flow rate enhances heat removal from the cylinder surface, and increasing the cylinder heat input enhances heat transfer in the rear portion of the cylinder.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Harish K. Patel, Sukhjeet Arora, Rutuja Chavan, Bimlesh Kumar
Summary: This study experimentally analyzed the multiscale statistical assessment of scour depth surrounding spur dikes with downward seepage. The research found that seepage affects the morphological behavior and hydrodynamic characteristics of the channel bed, leading to changes in scour formation. The rate of scour depth changes initially increases with higher seepage velocity but eventually becomes constant over time.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Justas Sereika, Paulius Vilkinis, Gediminas Skarbalius, Algis Dziugys, Nerijus Pedisius
Summary: This study experimentally investigated the pulsatile flow structure based on a transitional-type cavity. It was found that the pulsation amplitude has a more significant effect on the dynamics of recirculation zone than the pulsation frequency. Pulsatile flow can reduce the size of the recirculation zone.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Merav Arogeti, Eran Sher, Tali Bar-Kohany
Summary: This study provides a detailed exploration of the events that occur when a droplet hits a dry solid surface of various small sizes, with a focus on the deposition, receding breakup, and prompt splash phases. By utilizing non-dimensional analysis and graphical representation, the boundaries between different events are defined, and criteria for differentiation based on target-to-drop ratio, Reynolds, and Webber numbers are presented.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Tianxiong Li, Fei Wen, Yingchun Wu, Botong Wen, Lei Wang, Jinxin Guo, Xuecheng Wu
Summary: This study investigates the structure of the flow field induced by a strut in a scramjet and its influence on flame stabilization. Experimental and numerical analyses reveal that the flow field exhibits features beneficial for flame stabilization, but the asymmetry of the flow poses a challenge to flame establishment.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Syed Ehtisham Gillani, Yasir M. Al-Abdeli
Summary: This study investigates the asymmetry in bluff-body stabilised annular jets and finds that swirl can significantly mitigate the asymmetry and restore the symmetry of the jets. Moreover, increasing the Reynolds number and the swirl intensity can both decrease the asymmetry of the jets.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Utsav Bhardwaj, Rabindra Kumar, Shyama Prasad Das
Summary: This study presents an experimental investigation on flooding phenomenon in a pulsating heat pipe (PHP) unit cell, and analyzes the impact of flooding on the performance of PHP. The study recognizes three different flooding mechanisms and finds that currently accepted correlations for predicting flooding velocity are inaccurate. The study emphasizes the need for further research on flooding in PHPs.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)
Article
Thermodynamics
Yunpeng Xue, Yongling Zhao, Shuo-Jun Mei, Yuan Chao, Jan Carmeliet
Summary: This study investigates the impact of building morphology on local climate, air quality, and urban microclimate. The researchers conducted an experimental investigation in a large-scale water tunnel, analyzing heat and flow fields using Laser-induced Fluorescence (LIF) and Particle Image Velocimetry (PIV). The findings show that factors such as canyon configuration, buoyant force, and approaching flow magnitude significantly influence fluid flow in street canyons, and the morphology of the street canyon dominates ventilation rate and heat flux. For example, changing the aspect ratio of a street canyon can lead to a significant change in air ventilation rate, ranging from 0.02 to 1.5 under the same flow conditions.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2024)