Numerical and experimental analysis of cooling performance of single-phase array microchannel heat sinks with different pin-fin configurations

Yang, Di; Wang, Yan; Ding, Guifu; Jin, Zhiyu; Zhao, Junhong; Wang, Guilian

doi:10.1016/j.applthermaleng.2016.08.211

Cited by 143 publications

(29 citation statements)

References 18 publications

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“…33 Besides, geometry of pin fin is significant for fluid flowing and heat transfer behaviors, so the investigation on various shapes of pin fin was conducted by some researchers. 34,35 Xia investigated the flow regimes within three different micropin fins by numerical simulations and micro-PIV. 36 In his conclusion, the microchannel with diamond pin fins showed the highest Nu from the simulation results.…”

Section: Discussionmentioning

confidence: 99%

Research on the mechanism of heat transfer enhancement in microchannel heat sinks with micropin fins

et al. 2020

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Summary In this paper, the pressure drop and heat transfer features of a microchannel applying micropin fins are investigated by numerical simulations and experiments. The microchannel, which is 20‐mm long, 2.7‐mm wide, and 0.3‐mm deep, is fabricated with copper and consisted of staggered diamond micropin fins. The visualization experiments, by means of the advanced technology micro‐particle image velocimetry (PIV), are conducted to discuss the mechanism of heat transfer by analysing the flow regimes. Meanwhile, 3D‐coupled numerical simulations are applied for the combination with experiments in this research. It is found that the vortex‐wake flow is stable at Reynolds number (Re) = 0 to 300, and a steady recirculating zone can be observed in the wake, where a pair of symmetrical vortices is formed. All the time, the vortex‐wake flow is unstable at Re = 300 to 650. Under this situation, it is due to the decrease of vorticity that the Nusselt number (Nu) is not significantly increased as it was expected. Thus, when Nu in the pin fin microchannel is predicted, the vorticity should be considered as well as turbulent kinetic energy (TKE). Furthermore, comparative study was carried out based on the mechanism proposed in this study among three kinds of microchannel with different fins, including staggered circular pin fins (CPF), square pin fins (SPF), and diamond pin fins (DPF).

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Section: Discussionmentioning

confidence: 99%

Research on the mechanism of heat transfer enhancement in microchannel heat sinks with micropin fins

et al. 2020

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“…The proposed flow structures improve the temperature uniformity of the microchannel, which can be useful for the laminar heat transfer enhancement researches employing triangular, square and circular pin-fins [25][26][27][28]. As shown in Figure 3, when Re = 200, compared to Figure 2, the highest temperature region of pin-fin with both fillet and bulb has changed from the rear of the cylinder to the vortex region near the corner when Re changes from 50 to 200.…”

Section: Flow Structure and Temperature Distributionmentioning

confidence: 94%

Effects of Endwall Fillet and Bulb on the Temperature Uniformity of Pin-Fined Microchannel

Pan

et al. 2017

Entropy

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Endwall fillet and bulb structures are proposed in this research to improve the temperature uniformity of pin-fined microchannels. The periodical laminar flow and heat transfer performances are investigated under different Reynolds numbers and radius of fillet and bulb. The results show that at a low Reynolds number, both the fillet and the bulb structures strengthen the span-wise and the normal secondary flow in the channel, eliminate the high temperature area in the pin-fin, improve the heat transfer performance of the rear of the cylinder, and enhance the thermal uniformity of the pin-fin surface and the outside wall. Compared to traditional pin-fined microchannels, the flow resistance coefficient f of the pin-fined microchannels with fillet, as well as a bulb with a 2 µm or 5 µm radius, does not increase significantly, while, f of the pin-fined microchannels with a 10 µm or 15 µm bulb increases notably. Moreover, Nu has a maximum increase of 16.93% for those with fillet and 20.65% for those with bulb, and the synthetic thermal performance coefficient TP increases by 16.22% at most for those with fillet and 15.67% at most for those with bulb. At last, as the Reynolds number increases, heat transfer improvement of the fillet and bulb decreases.

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“…Yang et al, [13] and Yu et al, [14] had focused their studies in a pin-finned microchannel heat sink. The former studied five different pin fin configurations while latter focused in microchannel with piranha pin fin (PPF).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Heat Transfer in A Microchannel Heat Sink with Hourglass Channel Profile

Wong¹,

Chan²,

Goh³

2020

ARFMTS

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The present paper reports the numerical investigation of thermal and hydraulic performance of microchannel heat sink with hourglass profile (MCHS-HG). A 3-D conjugate heat transfer model was used to solve the problem with water as coolant and silicon as material of the heat sink. Performances of MCHS-HG were evaluated with 5 different contraction ratios, (0.2, 0.4, 0.6, 0.8 and 1.0) and 3 different aspect ratios from 4, 5 and 6 with Reynolds number in the range of 300-1800. Thermal performance of MCHS-HG was compared with microchannel heat sink with straight rectangular channel (MCHS-R). Results showed that thermal performance of MCHS-HG is better than MCHS-R for any given aspect ratio. The study on the effect of contraction ratio show that the optimum thermal performance is given by the contraction ratio of 0.4. Microchannel with narrower throat of hourglass profile gives higher pumping power. The assessment on thermal-hydraulic performance of MCHS-HG shows that the MCHS-HG is less economical to be applied as compare to MCHS-R.

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Numerical and experimental analysis of cooling performance of single-phase array microchannel heat sinks with different pin-fin configurations

Cited by 143 publications

References 18 publications

Research on the mechanism of heat transfer enhancement in microchannel heat sinks with micropin fins

Research on the mechanism of heat transfer enhancement in microchannel heat sinks with micropin fins

Effects of Endwall Fillet and Bulb on the Temperature Uniformity of Pin-Fined Microchannel

Numerical Study of Heat Transfer in A Microchannel Heat Sink with Hourglass Channel Profile

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