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Design Innovation

Oscillatory Streaming Flow Based Mini/Microheat Pipe Technology

[+] Author and Article Information
Z. Zhang, C. Liu, A. Fadl, D. M. Meyer

Department of Mechanical Engineering, University of Rhode Island, Kingston, RI 02881

M. Krafczyk

Department of Mechanical Engineering, University of Rhode Island, Kingston, RI 02881; Department of Architecture, Civil Engineering, and Environmental Sciences, Institute for Computational Modeling in Civil Engineering, TU Braunschweig, Braunschweig 38023, Germany

H. Sun

Department of Mechanical Engineering, University of Rhode Island, Kingston, RI 02881; Department of Mechanical Engineering, University of Massachusetts, Lowell One University Avenue, Lowell, MA 01854

J. Heat Transfer 132(5), 055001 (Mar 05, 2010) (8 pages) doi:10.1115/1.4000443 History: Received January 12, 2009; Revised August 20, 2009; Published March 05, 2010; Online March 05, 2010

The sustained drive for faster and smaller micro-electronic devices has led to a considerable increase in power density. The ability to effectively pump and enhance heat transfer in mini-/microchannels is of immense technological importance. Using oscillatory flow to enhance the convective heat transfer coefficients in micro-/minichannels is one of many new concepts and methodologies that have been proposed. In this paper, a novel and simple concept is presented on oscillating streaming flow based mini/microheat pipe or heat spreader technology. Phenomena of the flow streaming can be found in zero-mean velocity oscillating flows in many channel geometries. Although there is no net mass flow (zero-mean velocity) passing through the channel, discrepancy in the velocity profiles between the forward and backward flows causes fluid particles near the walls to drift toward one end while particles near the centerline drift to the other end. This unique characteristic of flow streaming could be used for various applications. Some of the advantages include enhanced heat/mass transfer, pumpless fluid propulsion, multichannel fluid distribution, easy system integration, and cost-effective operation. Preliminary work has been conducted on scaling analysis, computer simulations, and visualization experiments of fluid streaming, propulsion, and multichannel distribution by flow oscillation in minitapered channels and channel networks. Results show that streaming flow has the potential to be used as a cost-effective and reliable heat pipe and/or as a heat spreader technique when fluid thermal conductivity is low.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Mechanisms of flow streaming in a bifurcation channel

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Figure 2

Bifurcation channel networks used in the computer simulation

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Figure 3

The experimental setup and channel network configurations: (a) color patterns before the flow streaming (T=6 s); (b) fluid mixing, propulsion, and multichannel distribution by oscillation flow streaming (T=14 s)

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Figure 4

Images of transient particle transport patterns in microbifurcation under flow streaming

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Figure 5

Oscillating streaming flow induced temperature profile in a tapered channel. From the left, cold fluid enters the channel initially occupied by hot fluid (Remax=0.7, f=10 Hz, K=0): (a) T=0.1 s (end of the first cycle); (b) T=2.0 s (end of the 20th cycle)

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Figure 6

Effects of oscillation amplitude on relative streaming displacement. Oscillation frequency f=6 Hz was simulated; displacement as a function of (a) oscillation cycle number and (b) axial position

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Figure 7

Effects of oscillation frequency on relative streaming displacement. Oscillation amplitude A=1 mm was simulated; displacement as a function of (a) oscillation cycle number and (b) axial position

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Figure 8

Effects of the Prandtl number on the convective heat transport process under flow streaming

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