Article
Thermodynamics
Gaofeng Lu, Jianrong Yang, Xiaoqiang Zhai, Xiaolin Wang
Summary: This paper investigates hotspot-targeted thermal management using VGs in microchannels, showing that the adoption of VGs can significantly improve cooling effect over the hotspot with lower pressure loss.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Review
Energy & Fuels
Hao Yu, Tongling Li, Xiaoxin Zeng, Tianbiao He, Ning Mao
Summary: This paper reviews, classifies, and summarizes the microchannel geometry characteristics of previous studies. It mainly focuses on the impact of microchannel geometry features and structural design on heat transfer and pressure drop, and discusses the future research direction of microchannel geometry design.
Article
Thermodynamics
Jian Song, Fei Liu, Yi Sui, Dalei Jing
Summary: This study numerically investigates the hydraulic and thermal performances of trapezoidal microchannel heat sinks, revealing that pressure drop increases with decreasing small-to-large end width ratio. Only TMCHS configurations with PCPFLI and RCCFLI show improved thermal performances as the ratio decreases, with lower thermal resistance and more uniform temperature distribution. The TMCHS with RCCFLI configuration exhibits the best overall thermal performance among the six configurations studied.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Houpei Li, Pega Hrnjak
Summary: This paper presents the measurements of flow boiling heat transfer coefficient and pressure gradient for R32 and R1234yf mixtures in a microchannel tube. The results show that mass flux has a significant effect on both heat transfer coefficient and pressure gradient, while heat flux only affects the heat transfer coefficient. Furthermore, the temperature glide curve has an impact on the heat transfer coefficient.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Analytical
Tao Zhou, Bingchao Chen, Huanling Liu
Summary: This article discusses the use of topology optimization to design heat exchangers, proposing a novel design with three inlets and one outlet. The impact of channel depth on heat exchanger design, as well as the flow and heat transfer performance of the heat exchangers, are also studied. Results show that topology optimization can significantly improve heat transfer performance compared to traditional design methods.
Article
Thermodynamics
Yanhong Sun, Ao Huang, Jinli Lu, Yuyan Jiang
Summary: This study experimentally investigated the heat transfer characteristics and dynamic flow boiling instabilities of ethanol in a rectangular microchannel. The results showed that the inhibition of bubble nucleation caused by large bubbles in the confined space led to a deterioration in heat transfer performance. Higher mass flux resulted in more effective bubble nucleation and better heat transfer. The triggering of flow boiling instability in the microchannel was strongly dependent on quasi-periodical flow phenomenon and multiphase alternation. The thermophysical properties of the working liquid significantly affected the fluctuation amplitude.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Chinmaya Kumar Patra, Anandaroop Bhattacharya, Prasanta Kumar Das
Summary: A one-dimensional flow-boiling model is developed to study the pressure drop and heat transfer mechanism in a microchannel of rectangular cross-section under slug-flow regime. The model considers different stages of bubble growth and the periodic passage of different zones to evaluate the pressure drop and heat transfer coefficient. The results show that the channel dimension, flow velocity, heat flux, and working fluid properties have significant effects on the pressure drop and heat transfer coefficient.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Xinyu Ji, Xiaoping Yang, Yuantong Zhang, Yonghai Zhang, Jinjia Wei
Summary: This article designs and manufactures silicon-based fractal tree-shaped microchannel heat sinks and experimentally studies their heat transfer and pressure drop characteristics. The results show that compared with traditional linear microchannel heat sinks, fractal microchannel heat sinks achieve significant improvements in flow drag reduction and heat transfer enhancement.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
D. D. Ma, Y. X. Tang, G. D. Xia
Summary: The sinusoidal wavy microchannels with secondary channels (SWSC) show better heat removal performance in flow boiling studies compared to conventional microchannels, thanks to increased bubble nucleation induced by enlarged surface area and continuous development of thin liquid film due to the introduction of secondary channels. However, the SWSC microchannels suffer from a higher pressure drop penalty.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Serdar Ozguc, Trevor F. G. Teague, Liang Pan, Justin A. Weibel
Summary: Topology optimization generates complex geometry heat sink designs suitable for additive manufacturing. Homogenization approach creates microchannel heat sink designs corresponding to microstructures, eliminating the need for penalizing porosities. This study fabricates and tests topology optimized microchannel heat sinks using additive manufacturing, achieving high-performance designs. The effect of grid resolution on the designs and the physical dimensions of microstructures is investigated. The experimental results match the predicted Pareto optimality curve, demonstrating the effectiveness of the homogenization approach in generating optimized heat sink designs.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
Ying Zhang, Minqiang Pan
Summary: The study focused on the heat transfer performance and structural influence of N-structure microchannel heat exchangers. The arrangement of wave channel sections in the N-structure significantly affects the performance of the microchannel heat exchanger. The symmetrical N-structure was found to have the best heat transfer effect.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Thermodynamics
Serdar Ozguc, Liang Pan, Justin A. Weibel
Summary: Efficient thermal management is crucial for electronic devices with nonuniform thermal workloads. A flow-shifting design approach is proposed to fully utilize flow for multiple potential thermal workloads. By optimizing the flow path from each inlet, the flow-shifting heat sink can effectively cool the active heat map.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Yunfei Yan, Jinhua Wu, Fulei Xu, Yanrong Chen, Ziqiang He
Summary: A drop-pressure microchannel heat sink with gradient distribution pin fin arrays and narrow slots (DP-MCHS-PS) was proposed to improve the excessive pressure drop in microchannel heat sinks (MCHS). The addition of narrow slots in the DP-MCHS-PS resulted in a smaller increase in pressure drop with increasing volume flowrate. Compared to conventional gradient distribution and uniform distribution, the DP-MCHS-PS exhibited a 56.3% and 52.7% decrease in pressure drop, respectively. The study also evaluated the temperature distribution, heat transfer performance, and thermal resistance of the DP-MCHS-PS.
APPLIED THERMAL ENGINEERING
(2023)
Review
Thermodynamics
Shashank Singh, Anup Malik, Harlal Singh Mali
Summary: This article critically examines the research on modifications in geometry of channels for thermo-hydraulic performance enhancement and aims to determine the best channel configuration with optimal parameters. It explores various designs and their influencing parameters, as well as presents conclusions and potential recommendations for future research.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Tingbo Hou, Danmin Xu
Summary: This study investigates the influence of the ellipticity of an elliptical concave cavity on the pressure drop and heat transfer performance of a microchannel heat exchanger (MHE). The results show that an MHE with ellipticity 1.0 exhibits the best pressure drop and heat transfer performance.
APPLIED THERMAL ENGINEERING
(2023)
