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HEAT TRANSFER IN NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS

A Theoretical Model for Axial Heat Conduction Effects During Single-Phase Flow in Microchannels

[+] Author and Article Information
Ting-Yu Lin

Thermal Analysis, Microfluidics, and Fuel Cell Laboratory,  Rochester Institute of Technology, 76 Lomb Memorial Drive, Rochester, NY 14623

Satish G. Kandlikar1

Fellow ASME Thermal Analysis, Microfluidics, and Fuel Cell Laboratory, Rochester Institute of Technology, 76 Lomb Memorial Drive, Rochester, NY 14623; Mechanical Engineering Department, Rochester Institute of Technology, 76 Lomb Memorial Drive, Rochester, NY 14623 e-mail: sgkeme@rit.edu

1

Corresponding author.

J. Heat Transfer 134(2), 020902 (Dec 13, 2011) (6 pages) doi:10.1115/1.4004936 History: Received January 05, 2011; Revised August 22, 2011; Published December 13, 2011; Online December 13, 2011

A model is developed to analyze the effect of axial conduction on heat transfer during single-phase flow in microchannels. The axial heat conduction in the wall introduces heat flow toward the inlet section resulting in an increase in the local fluid temperature and a corresponding increase in the wall temperature. Neglecting this effect while reducing the experimental data results in a lower value of the experimental Nusselt number. The model derived in this work takes into account this effect and offers a parameter to estimate the effect introduced by the axial heat conduction effect in the wall.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flow configuration for the analytical model

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Figure 2

Comparison of numerical simulation from Maranzana [21] and the present model, Eq. 16

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Figure 3

Comparison of numerical simulation by Herwig and Hausner [25] to the present model, Eq. 16

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Figure 4

Comparison of experimental data [26] to the present equation

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Figure 5

Comparison of experimental data [4] and the prediction by Eq. 16

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Figure 6

Comparison of experimental data [27] and prediction of proposed model x/Lh  = 0.25

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Figure 7

Axial conduction effects of fluid flow in commercial stainless steel 304 tubes

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Figure 8

Axial heat conduction effects of water flow in channel in Re = 50

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Figure 9

Axial conduction effects of water flow in silicon channel

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