Micro-Channel Heat Sink: A Review

Zhou, Jinzhi; Cao, Xiaoling; Zhang, Nan; Zhao, Xudong; Hardy, David

doi:10.1007/s11630-020-1334-y

Cited by 61 publications

(15 citation statements)

References 282 publications

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“…With the rapid development of aerospace, vehicles and ships and electronic chips in recent years, traditional heat exchangers have been unable to meet the needs of electronic components in terms of heat transfer efficiency, power-to-weight ratio and compactness [1][2][3]. Since 1981, Tuckerman et al [4] took the lead in proposing the concept of micro-channel, due to good heat transfer performance and other advantages, micro-channel heat sinks have gradually become a hot spot in the field of heat transfer research.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of heat transfer characteristics of composite structure jet microchannel based on Eulerian method

Juhui,

Wang,

et al. 2024

Preprint

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In this paper, in order to investigate the heat transfer characteristics of three-dimensional nanofluid jet microchannel (NJMC), the two-fluid model based on Euler's method coupled with the turbulence model is used to numerically simulate the Al2O3-desionized water jet impingement cooling process, and the results of the study show that the inlet flow rate of the nanofluid can strengthen the degree of its jet focusing and enhance the performance of heat transfer. In this paper, it is also found that the hemispherical micro-rib and side-flow orifices in the nanofluid array jet microchannel (NAJMC) can effectively strengthen the longitudinal vortex and slow down the velocity drift, and the nested micro-rib can effectively reduce the irreversible loss in the flow of nanofluid, and all three of them can make the heat transfer performance of the NAJMC go up. Therefore, in this paper, a nanofluid composite jet microchannel (NCJMC) is designed and numerically simulated, and the entropy production theory is used to analyze and evaluate the heat transfer performance of MCJMC, and it is found that the heat transfer performance of NCJMC is significantly improved compared with that of NAJMC. When the inlet flow rate is the same, its Nu and PEC are increased by 21.3% and 60.0%, respectively, compared with MAJMC, and the total entropy production is reduced by 38.0%.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of heat transfer characteristics of composite structure jet microchannel based on Eulerian method

Juhui,

Wang,

et al. 2024

Preprint

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“…Concerning the effect of the channels aspect ratio on the heat transfer performance, the recent review of Zhou et al [13], deals, among others, with the influence on the heat transfer performance and pressure drop of the aspect ratio of single-phase and two-phase fluids in micro-channel pipes. Several works cited in [13] indicate that the square-channel has a much better performance than other shape of channels (70% higher than circularshape) [14,15] although other works (Vinoth and Kumar [16]) point to trapezoidal channel cross-sections as optimal. Brinda et al [17] found that heat transfer coefficient could be enhanced by smaller aspect ratio, while Wang et al [18] indicate that high aspect ratio rectangular channels perform better.…”

Section: Introductionmentioning

confidence: 99%

Impact of Channels Aspect Ratio on the Heat Transfer in Finned Heat Sinks with Tip Clearance

et al. 2022

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A 3D numerical study is used to analyze the flow topology and performance, in terms of heat transfer efficiency and required pumping power, of heat sink devices with different channel aspect-ratio in the presence of tip-clearance. Seven different channel aspect ratios AR, from 0.25 to 1.75, were analyzed. The flow Reynolds numbers Re, based on the average velocity evaluated in the device channels region, were in the range of 200 to 1000. Two different behaviors of the global Nusselt were obtained depending on the flow Reynolds number: for Re<600, the heat transfer increased with the channels aspect ratio, e.g., for Re=400, the global Nusselt number increased by 14% for configuration AR=1.75 when compared to configuration AR=0.25. For Re>600, the maximum Nusselt is obtained for the squared-channel configuration, and, for some configurations, flow destabilization to a unsteady regime appeared. For Re=700, Nusselt number reduced when compared with the squared-channel device, 11% and 2% for configurations with AR=0.25 and 1.75, respectively. Dimensionless pressure drop decreased with the aspect ratio for all cases. In the context of micro-devices, where the Reynolds number is small, these results indicate that the use of channels with high aspect-ratios is more beneficial, both in terms of thermal and dynamic efficiency.

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“…Micro-chemical technology involves processes where chemical reactions are conducted in micron or millimetre confined spaces, [7] and the core element in the microchemical technology is the micro-reactor. Due to the small channel sizes of micro-channel reactors (usually in the range of 10-2000 μm), [7,8] they have large specific surface areas, high heat transfer efficiencies, [9][10][11] short residence times, [12] and narrow residence time distributions. [13] A micro-reactor adopts a continuous flow reaction technology where there is only a small amount of raw materials in the reactor with a very small reactant volume, such that accidents are optimally controlled.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient approach to the synthesis of 2‐Chloro‐2‐methylbutane in a continuous‐flow microreactor

Song

et al. 2022

Can J Chem Eng

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2‐Chloro‐2‐methylbutane is an important organic compound widely used as a starting material in organic synthesis. It is mainly produced by the addition reaction of isoamylene and hydrochloric acid. As a raw material, isoamylene has a low boiling point and an extremely low flash point, making it a high‐risk material in large‐scale industrial productions. In this paper, a highly efficient production of 2‐Chloro‐2‐methylbutane was realized using a continuous flow micro‐channel reactor. Through the back pressure system of the reactor, the fluid pressure was increased, which elevated the reaction temperature, and enhanced the rate of reaction. The obtained optimal reaction conditions for the process were a reaction temperature of 90°C, pressure of 0.67 MPa, residence time of reactants of 15 min, n (hydrochloric acid):n (isoamylene) = 2.80:1.00, and v (hydrochloric acid):v (isoamylene) = 4.40:1.76. Compared with a batch process, the micro‐channel process significantly shortened the reaction time and conversion a continuous and an efficient production. Computational analysis using computational fluid dynamics (CFD) simulation software was used to simulate the two‐phase flow in the micro‐channel reactor, and the results were consistent with the experimental results.

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Micro-Channel Heat Sink: A Review

Cited by 61 publications

References 282 publications

Numerical simulation of heat transfer characteristics of composite structure jet microchannel based on Eulerian method

Numerical simulation of heat transfer characteristics of composite structure jet microchannel based on Eulerian method

Impact of Channels Aspect Ratio on the Heat Transfer in Finned Heat Sinks with Tip Clearance

Highly efficient approach to the synthesis of 2‐Chloro‐2‐methylbutane in a continuous‐flow microreactor

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