Article
Thermodynamics
Chengfeng Zhu, Yanzhong Li, Hongbo Tan, Jiamin Shi, Yang Nie, Qingquan Qiu
Summary: This article introduces a novel high temperature superconducting hybrid energy pipe, which can suppress quench phenomenon under thermal disturbance by using liquid nitrogen as the protective medium. A one-dimensional quench model is proposed to analyze the multi-field coupled effects of thermal disturbance on the quench and recovery process of the pipe. The results show that the high temperature region moves towards the upstream direction during the recovery process, and there are different characteristic zones.
Article
Thermodynamics
Rongji Xu, Xiaona Li, Taoming Lei, Qingping Wu, Ruixiang Wang
Summary: By introducing a gravity pulsating heat pipe (GPHP), the gravity effect of the working fluid (WF) can be enhanced to increase the heat transfer limit and solve the dry-up issue in a conventional pulsating heat pipe (PHP) under high heat input. Experimental investigation of the GPHP using HFE-750 0 as the WF under different heat inputs (30-230 W) revealed three heat transfer stages: low heat-input steady-state operation, transition, and high heat-input steady-state operation. The GPHP exhibited quick and stable heat transfer performance at low heat input, while in the transition stage, the accumulation of liquid WF and the formation of a stable vapor film hindered heat transfer. Under high heat input, the liquid WF returned to the evaporative section, resulting in stable heat transfer with increasing latent heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Zipei Su, Yanxin Hu, Shaobin Zheng, Chao Dang, Kaizhao Liu, Jiapei Chen, Jin Huang
Summary: A new annular structure of APHP was designed for evacuated solar collector, which can reduce the contact thermal resistance and alleviate the overheating problem. Experiments were conducted to study the effects of filling ratio, heat transfer distance, inclination angle, and working fluid on flow circumstances and heat transfer performance. The results showed that high-frequency and low-amplitude temperature curve appeared with low flow resistance, and the optimal filling ratio and inclination angle were 60% and 60 degrees, respectively. The heat transfer performance of APHP decreased with increasing heat transfer distance, and the use of self-rewetting fluid demonstrated a significant effect on heat transfer enhancement, reducing thermal resistance on average by 32.46%, 34.15%, and 37.40% over different heat transfer distance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Multidisciplinary
Yunzhi Ling, Xiaozhao Li, Xiaosong Zhang, Zhan Liu, Peng Zhao
Summary: An experimental study was conducted to investigate the thermal performance of an oscillating heat pipe (OHP) for thermal management of electronic devices. The results showed that as the heat input increased, the average thermal resistance decreased and the stable evaporating and condensing temperatures increased. An empirical correlation was proposed to evaluate the thermal resistance of the OHP system based on the derived theoretical analysis.
APPLIED SCIENCES-BASEL
(2023)
Article
Thermodynamics
Ji Li, Guohui Zhou, Tong Tian, Xingping Li
Summary: This paper introduces a new compact loop heat pipe module, which achieves high reliability operation and high thermal performance through improved structure, suitable for cooling edge-computing server CPUs.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Xinyue Wang, Yang Liu, Tong Tian, Ji Li
Summary: This paper proposes an air directly cooling looped heat pipe (LHP) module for server cooling in data centers. With the introduction of an auxiliary wick and additional fin and fan assembly, significant improvement in heat load capacity is achieved.
Article
Thermodynamics
Valentin Guichet, Bertrand Delpech, Hussam Jouhara
Summary: Multi-channel flat heat pipe is an innovative technology used to absorb and reuse wasted heat in the rear of photovoltaic cells. This study built a unique three-leg heat pipe to investigate the fundamentals of two-phase heat transfer inside multi-channel heat pipes. Computational fluid dynamic (CFD) and theoretical models were developed using ANSYS Fluent to simulate the heat pipe operation. The limitations of the Lee model for heat pipe simulation were identified, and a new theoretical model based on experimental data was developed to predict the thermal resistance of the three-leg heat pipe with improved accuracy.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Nuclear Science & Technology
Zhipeng Zhang, Chenglong Wang, Kailun Guo, Wenxi Tian, Suizheng Qiu, G. H. Su
Summary: Heat pipe reactors are gaining attention due to their advantages in terms of mobility, safety, and applicability. This paper conducts a 3D coupled analysis of a heat pipe reactor operating under steady-state conditions, providing insights into its behavior and performance.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Energy & Fuels
Haojie Zhou, Tong Tian, Xinyue Wang, Ji Li
Summary: In order to reduce the power consumption and improve the energy efficiency of data centers, a novel looped heat pipe (LHP) and thermoelectric generator (TEG) coupled system was proposed. By using low thermal resistance heat dissipation apparatus and high-efficiency thermoelectric power generation devices, the power output was significantly improved, enabling servers with PUE values less than one.
Article
Thermodynamics
Trevor J. Shimokusu, Bruce Drolen, Corey Wilson, Jeffrey Didion, Geoff Wehmeyer
Summary: Oscillating heat pipe (OHP) devices provide high heat flow and low thermal resistance for spacecraft and terrestrial thermal management. In this study, strain gauges were attached to the exterior casing of a multi-turn OHP to measure strain and analyze the frequency response of ammonia vapor pressure fluctuations. The results showed that the strain signals could be effectively described by a low-pass filter fitting function, with increasing amplitude and characteristic knee frequency at higher thermal loads. The findings suggest that externally placed and minimally invasive strain gauges can provide diagnostic capabilities and additional insight into the operation of lightweight OHP devices in both the startup and stable regimes for thermal management applications.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Rong-Hong Xu, Tian Zhao, Huan Ma, Ke-Lun He, Hong-Kun Lv, Xu-Tao Guo, Qun Chen
Summary: This work tackles the challenge of accurately and efficiently analyzing the different energies in distributed energy systems. A holistic model is built, taking into account the nonlinearity of energy transport and conversion processes. An efficient optimization algorithm is proposed, resulting in an operation cost of $7873.68. The study reveals the tight spatiotemporal coupling of various devices and the significant influence of nonlinear characteristics in heat transfer, power transmission, and power-heat conversion processes.
Article
Thermodynamics
Enpei Wang, Lei Li
Summary: In this study, the thermal behavior performance of a heat pipe with potassium as the working fluid and a capillary wick structure was investigated under marine conditions using numerical simulations. A CFD model was developed using user-defined functions (UDFs) to account for the physical properties of potassium and the additional force method of rolling motion. The model was validated with experimental results and used to analyze the influence of parameters such as inclination angle, filling ratio, and rolling period on the temperature distribution and thermal resistance of the heat pipe. The results were visualized through phase change and wall temperature distribution charts obtained from CFD simulations. The findings provide valuable insights for the design and evaluation of high temperature heat pipe applications in marine environments.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Jiao Li, Siqin Hou, Da Teng, Guoqing Shen
Summary: Acoustic reinforced heat transfer is a method that improves heat transfer efficiency by adjusting the parameters of the acoustic field. Experimental results showed that a heat exchanger with an acoustic field had better heat transfer effect. Parameters such as sound pressure level, acoustic frequency, and inlet temperature of the hot flue gas significantly influenced the enhanced heat transfer effect.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
M. Muneeshwaran, Yun-Jin Lee, Chi-Chuan Wang
Summary: This study aimed to improve the heat transfer performance of heat sinks with vapor chamber heat spreader by developing parallelogram fins integrated with heat pipes. Results showed significant reduction in thermal resistance and chip temperature with the proposed design.
APPLIED THERMAL ENGINEERING
(2022)
Article
Nuclear Science & Technology
Chenglong Wang, Zhipeng Zhang, Minghao Zhang, Panxiao Li, Zhixing Tian, Wenxi Tian, Suizheng Qiu, G. H. Su
Summary: This study develops a high-temperature heat pipe transient analysis code that takes into account the influence of non-condensable gas (NCG). Numerical evaluations of frozen start-up and key parameters sensitivity are conducted. The results show that the presence of NCG can increase the start-up time of heat pipes, but it also facilitates a smoother start-up process.
ANNALS OF NUCLEAR ENERGY
(2022)
Article
Thermodynamics
Sihui Hong, Yongle Tang, Chaobin Dang, Shuangfeng Wang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Review
Thermodynamics
Weixiong Wu, Shuangfeng Wang, Wei Wu, Kai Chen, Sihui Hong, Yongxin Lai
ENERGY CONVERSION AND MANAGEMENT
(2019)
Article
Engineering, Electrical & Electronic
Yee-Ting Lee, Chaobin Dang, Sihui Hong, An-Shik Yang, Tsai-Lung Su, Yung-Chun Yang
MICROELECTRONIC ENGINEERING
(2019)
Article
Energy & Fuels
Jin Huang, Jiajie Dai, Shuaiqiao Peng, Tingyu Wang, Sihui Hong
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2019)
Article
Thermodynamics
Yee-Ting Lee, Sihui Hong, Chaobin Dang, Liang-Han Chien, Li-Wang Chang, An-Shik Yang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Yongle Tang, Sihui Hong, Shuangfeng Wang, Dewen Deng
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Sihui Hong, Siqiang Jiang, Yanxin Hu, Chaobin Dang, Shuangfeng Wang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Yee-Ting Lee, Sihui Hong, Chaobin Dang, Liang-Han Chien, An-Shik Yang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Sihui Hong, Chaobin Dang, Eiji Hihara
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Sihui Hong, Chaobin Dang, Eiji Hihara
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Sihui Hong, Chaobin Dang, Eiji Hihara
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Energy & Fuels
Yee-Ting Lee, Sihui Hong, Liang-Han Chien, Chih-Jer Lin, An-Shik Yang
Article
Thermodynamics
Yee-Ting Lee, Sihui Hong, Liang-Han Chien, Wan-Hsuan Lin, An-Shik Yang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Sihui Hong, Bohan Zhang, Chaobin Dang, Eiji Hihara
Article
Thermodynamics
Sihui Hong, Chaobin Dang, Eiji Hihara, Hitoshi Sakamoto, Mizuki Wada
APPLIED THERMAL ENGINEERING
(2020)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)