Review
Thermodynamics
Arman Haghighi, Akbar Maleki, Mamdouh El Haj Assad, Lingen Chen, Mohammad Alhuyi Nazari, Mostafa Safdari Shadloo
Summary: Heat pipes are widely used for thermal management in high heat flux devices. Special working fluids such as hydrogen, neon, and nitrogen are necessary for efficient heat transfer at very low temperatures. The performance of cryogenic heat pipes depends on factors like filling ratio, input power, and working fluid, with their effective thermal conductivity surpassing that of conductive metals significantly. Further research is recommended to enhance the performance of cryogenic heat pipes.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Kimihide Odagiri, Kieran Wolk, Stefano Cappucci, Stefano Morellina, Scott Roberts, Andre Pate, Benjamin Furst, Eric Sunada, Takuro Daimaru
Summary: This paper presents a three-dimensional heat transfer analysis of a flat-plate oscillating heat pipe (OHP) and reveals the combined effect of thermo-hydraulic phenomena and thermal diffusion in the OHP structure. Surface roughness and liquid film thickness in the channel were found to have an impact on the operating temperature distribution.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Qingchun Zhu, Weimin Guo, Rui Zhuan, Peng Zhang
Summary: The experimental and numerical analysis of cryogenic wicking of liquid nitrogen in metallic screens yielded good agreement, showing the significant impact of weave densities of Dutch Twill Weaves (DTW) on the wicking performance. The study provided valuable insights into the flow and heat transfer characteristics for the liquid acquisition device of cryogenic propellant.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yulong Ji, Mengke Wu, Yanmin Feng, Huaqiang Liu, Xin Yang, Yadong Li, Chao Chang
Summary: This paper investigates the performance of liquid metal high-temperature oscillating heat pipes (LMHOHPs) with different proportions of sodium-potassium alloy (NaK) as working fluids. The experimental results show that these heat pipes can successfully start up and transfer heat through oscillating motion at different inclination angles and input powers. The heat transfer performance of the heat pipes significantly improves with the increase of potassium mass fraction.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Analytical
Chao Chang, Yaoguang Yang, Lilin Pei, Zhaoyang Han, Xiu Xiao, Yulong Ji
Summary: With the rapid development of electronics, thermal management is becoming increasingly important. This study used metal 3D printing technology to develop an aluminum flat-plate oscillating heat pipe (OHP) with high-precision molding and complex inner channels. Experimental results showed that the 3D-printed OHP with a 60% filling ratio had better heat transfer performance and lower thermal resistance, and it could work properly in different operation modes.
Article
Thermodynamics
Bingyao Lin, Nanxi Li, Shiyue Wang, Leren Tao, Guangming Xu, Yinong Wu
Summary: This paper establishes a thin film evaporation model to analyze the effects of pore size and superheating on heat transfer, as well as the influence of the wick diameter in a loop heat pipe on the critical heat flux. The results indicate that the length of the transition film and intrinsic meniscus significantly affect the evaporation process, and a smaller pore size can achieve a higher heat transfer coefficient.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Thermodynamics
Mengke Wu, Yulong Ji, Yanmin Feng, Huaqiang Liu, Xin Yang
Summary: In this study, the start-up performance, flow state, and heat transfer performance of the liquid metal high-temperature oscillating heat pipe (LMHOHP) were investigated through experiments. The results showed that LMHOHPs with filling ratios of 22-80% could successfully start up and the heat transfer was carried out through oscillation flow. With filling ratios of 35-64%, the flow state of LMHOHPs could change from oscillation flow to unidirectional circulation flow, leading to significantly enhanced heat transfer performance. The thermal resistance of LMHOHPs decreased and then increased with the filling ratio when the inclination angle was 30-90 degrees, achieving a minimum thermal resistance of 0.081 degrees C/W at a filling ratio of 48%. However, when the inclination angle was 0 degrees, the thermal resistance of LMHOHPs increased monotonically with the filling ratio.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Matthew Francom, Jungho Kim
Summary: Oscillating heat pipes are considered a promising passive mechanism for the removal or spreading of heat. Despite their simple construction, the fluid dynamics and thermodynamics of these devices are still poorly understood. Experimental results show that latent heat transfer is the dominant heat transfer mechanism in oscillating heat pipes, accounting for the majority of total heat transferred in all cases.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2021)
Article
Energy & Fuels
Lukasz Adrian, Szymon Szufa, Piotr Piersa, Filip Mikolajczyk
Summary: This paper presents research results on heat pipe numerical models for optimization of heat pipe heat exchangers. The findings show potential for applications in passive and low-energy construction, and confirm the ability of heat pipes to intensify heat transfer processes and reduce energy consumption.
Article
Thermodynamics
Jie Qu, Anhao Zuo, Heng Liu, Jiateng Zhao, Zhonghao Rao
Summary: This study investigated the application of three-dimensional oscillating heat pipes (3D-OHPs) in latent heat thermal energy storage (LHTES) systems, with a focus on designing novel structures to enhance thermal performance. Experimental results demonstrated that 3D-OHPs could effectively assist the thermal energy storage process, especially in cases where the phase change material had low thermal conductivity.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
S. K. Yeboah, J. Darkwa
Summary: The study investigated the integration of helically coiled oscillating heat pipes (HCOHPs) with packed beds of varying configurations to achieve isothermal adsorption. Results showed that maximum bed temperature reduction and adsorption peak temperature reduction in different systems depended on HCOHP start-up and system configuration.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Jiameng Tian, Bufa Li, Junfeng Wang, Bin Chen, Zhifu Zhou, Hai Wang
Summary: This work conducted an experimental investigation on transient cooling performance using a single-pulsed flash-evaporation spray, providing further insight into phase-change heat transfer on the hot surface. Factors such as the nozzle-to-surface distance and nozzle orifice diameter were found to affect the cooling effect.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yuguo Gao, Qianchao Hu, Yitao Ren, Xinyu Wang, Shuman Guo, Zhonglan Hou, Pengyan Guo
Summary: Nanofluids have been found to effectively enhance the heat transfer performance of different types of heat pipes. This paper provides a comprehensive literature review on the application of nanofluids in thermosyphon heat pipe, pulsating heat pipe, and wick heat pipe. The influence of important variables such as different nanoparticles, concentrations, packing ratios, inclination angles, and thermal loads on heat pipe performance is discussed. Studies show that there is an optimal nanoparticle concentration for highly efficient utilization. The enhanced heat transfer performance is attributed to the enhanced Brownian motion, improved surface wettability, increased nucleation sites, and inherently high thermal conductivity of nanofluids. Finally, the current problems and future trends of heat pipe technology based on nanofluids are discussed.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Florian Schwarz, Shabhrish Reddy Uddehal, Alexander Lodermeyer, Eman Mohamadi Bagheri, Brigitte Forster-Heinlein, Stefan Becker
Summary: This study quantifies the thermal performance and flow behavior of oscillating heat pipes with a centrally located hot spot heater, revealing a strong interrelation between flow velocity values and resulting thermal resistance. The results show that higher flow velocity leads to lower thermal resistance, indicating a significant correlation between flow pattern and heat transfer in OHPs.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Aerospace
Xiting Chen, Chao Qi, Wen Wang, Jianyin Miao, Hongxing Zhang
Summary: This study investigates the evaporation characteristics in sintered porous wicks for cryogenic loop heat pipes. A new geometric model is developed to characterize the porous skeleton and a mathematical model is built considering the Marangoni effect and slip velocity effect. The evaporation characteristics of the thin-film region are discussed, and parametric analysis is conducted to study the effects of different factors on the interface profile and evaporation heat transfer process.
MICROGRAVITY SCIENCE AND TECHNOLOGY
(2022)
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)
