Forced convective heat transfer across a pin fin micro heat sink

Peles, Yoav; Koşar, Ali; Mishra, Chandan; Kuo, Chih-Jung; Schneider, Brandon

doi:10.1016/j.ijheatmasstransfer.2005.03.017

Cited by 416 publications

(147 citation statements)

References 23 publications

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“…The aspect ratio of pillars used in this study was about 10 and the experimental results are compared with that compiled by Zukauskas and Ulinskas [10]. The friction factor f * used by Zukauskas and Ulinkas is given by equation (2). The experimentally determined friction factors with the Reynolds number for circle aligned and staggered patterns are shown in figure 6.…”

Section: Resultsmentioning

confidence: 99%

Pressure drop of laminar gas flows in a microchannel containing various pillar matrices

Vanapalli

Brake

Jansen

et al. 2007

J. Micromech. Microeng.

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The pressure drop of gas flows in a microchannel filled with a dense pillar matrix was investigated with specific attention to a pillar shape. Pillars of height 250 µm and aspect ratio of about 10 were etched in silicon using an optimized Bosch deep reactive ion etching process. The pressure drop head-loss coefficient due to compression and expansion of gas at the inlet and outlet of the pillar matrix was estimated to be about 1.4 for an opening ratio of 10. A comparison of friction factor correlations for circular pillar cross-sections agreed rather well with the correlations proposed for the macroscale. Experimentally determined friction factor correlations for several pillar cross-sections for Reynolds numbers in the range of 50-500 are presented. Among the various pillar cross-sections considered, sine-shaped pillars have the lowest friction factor. These pillar structures with low pressure drop but a rather large wetted area can be used quite effectively as regenerative materials enabling the development of microcryocoolers.

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Section: Resultsmentioning

confidence: 99%

Pressure drop of laminar gas flows in a microchannel containing various pillar matrices

Vanapalli

Brake

Jansen

et al. 2007

J. Micromech. Microeng.

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“…have received considerable attention in recent years [1][2][3][4][5][6][7][8]. With the rapid development of large scale integrated circuit, the cooling demand of microelectronic chip per unit area is as high as 10 7 W/m 2 [9], an effective and reliable method is urgently needed to solve the problem of high flux removal with effective methods.…”

Section: Introductionmentioning

confidence: 99%

Micro-PIV visualization and numerical simulation of flow and heat transfer in three micro pin-fin heat sinks

Xia

Chen

Cheng

et al. 2017

International Journal of Thermal Sciences

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“…The research on heat and mass enhancement based on flow control structures, such as pin-fin [2], groove [3], cavity [4], tip clearance [5], rib [6], dimple/protrusion [7], and bifurcation [8], is well conducted. Especially, the microchannel with pin-fins is widely used because of its high efficiency of heat transfer.…”

Section: Introductionmentioning

confidence: 99%

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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Forced convective heat transfer across a pin fin micro heat sink

Cited by 416 publications

References 23 publications

Pressure drop of laminar gas flows in a microchannel containing various pillar matrices

Pressure drop of laminar gas flows in a microchannel containing various pillar matrices

Micro-PIV visualization and numerical simulation of flow and heat transfer in three micro pin-fin heat sinks

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

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