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Research Papers

Numerical Investigation of Heat Transfer Enhancement in a Microchannel With Grooved Surfaces

[+] Author and Article Information
O. Abouali

Department of Mechanical Engineering, School of Engineering, Shiraz University, Shiraz, Fars 71348-51154, Iranabouali@shirazu.ac.ir

N. Baghernezhad

Department of Mechanical Engineering, School of Engineering, Shiraz University, Shiraz, Fars 71348-51154, Iran

1

Corresponding author.

J. Heat Transfer 132(4), 041005 (Feb 18, 2010) (8 pages) doi:10.1115/1.4000862 History: Received September 30, 2008; Revised April 11, 2009; Published February 18, 2010; Online February 18, 2010

This paper presents a numerical investigation for two types of grooves (rectangular and arc shapes) fabricated in the microchannel surfaces, which leads to enhancement in single-phase cooling. The pressure drop and heat transfer characteristics of the single-phase microchannel heat sink were investigated numerically for laminar flow. For this purpose, the conjugate heat transfer problem involving simultaneous determination of temperature fields in both solid and liquid regions was solved numerically. The numerical model was validated with comparison to experimental data, in which good agreement was seen. A simple microchannel with available experimental data was selected, and it was shown that using grooved surfaces on this microchannel has a noticeable effect and heat removal rate can be increased using this technique. The results depict that the arc grooves have a higher heat removal flux compared with rectangular grooves but the latter have a higher coefficient of performance for the case in which grooves are made in the floor and both side walls. Also, it was shown that a grooved microchannel with higher wall thickness and lower mass flow rate of cooling water has a higher heat removal flux and coefficient of performance compared with a simple microchannel with minimum wall thickness. Effect of various sizes and distances of the floor grooves was determined, and the cases for maximum heat removal rate and coefficient of performance for both rectangular and arc grooves were obtained.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Microchannel with structures formed in the sidewalls and floor of the channel: (a) rectangular groove; (b) arc groove

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Figure 2

Schematic of the heat sink unit cell for the numerical simulation

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Figure 3

Comparison of the present numerical result and experimental data of Qu and Mudawar (17) for the pressure drop in a simple microchannel

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Figure 4

Comparison of the present numerical result and experimental data of Hong and Hsieh (18) for the normalized Nusselt number and friction factor

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Figure 5

Comparison between the simple microchannel and microchannel with rectangular groove surfaces for maximum heat removal flux (Ts=85°C, Re=900)

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Figure 6

Comparison between the simple and rectangular grooved microchannels for axial velocity in the centerline of the channel (Re=900)

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Figure 7

Comparison between the simple microchannel and microchannels with rectangular groove surfaces for the friction factor (Ts=85°C, Re=900)

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Figure 8

Comparison between the simple microchannel and microchannel with arc groove surfaces for the maximum heat removal flux (Ts=85°C, Re=900)

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Figure 9

Comparison between the simple microchannel and microchannels with arc groove surfaces for the friction factor (Ts=85°C, Re=900)

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Figure 10

Comparison of COP for microchannels with rectangular and arc grooves (Re=900, Ts=85°C)

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Figure 11

Comparison between microchannel with rectangular and arc grooves and simple microchannel with minimum fin thickness for removal heat flux (Ts=85°C, Re=900)

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Figure 12

Comparison between microchannel with rectangular and arc grooves and simple microchannel with minimum fin thickness for COP (Ts=85°C, Re=900)

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Figure 13

Removal heat flux for the microchannel with various sizes and spacings of rectangular grooves (Ts=85°C)

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Figure 14

Removal heat flux for microchannel with various sizes and spacings of arc grooves (Ts=85°C)

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Figure 15

Friction factor of microchannel with various sizes and spacings of rectangular grooves (Ts=85°C)

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Figure 16

Friction factor of microchannel with various sizes and spacings of arc grooves (Ts=85°C)

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Figure 17

COP for microchannel with various sizes of rectangular and arc grooves (Re=900, Ts=85°C)

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