Duryodhan, V S and Singh, A and Singh, Shiv Govind and Agrawal, A
(2016)
Three-Dimensional Numerical Study of Conjugate Heat Transfer in Diverging Microchannel.
Proceedings of the Indian National Science Academy, 82 (2).
pp. 321-328.
ISSN 0370-0046
Abstract
Increase in applications of varying cross sectional area microchannels in microdevices has provided the need to understand
fluid flow and heat transfer through such flow passages. This study focuses on conjugate heat transfer study through a
diverging microchannel. Three-dimensional numerical simulations are performed using commercially available package.
Diverging microchannels with different geometrical configurations (i.e. varying angle: 1-8°, depth: 86-200 μm, solid-to-
fluid thickness ratio: 1.5-4) are employed for this purpose. Simulations are carried out for varying mass flow rate (3.3 x
10
–5
-8.3 x 10
–5
kg/s) and heat flux (2.4-9.6 W/cm
2
) conditions. Heat distribution along the flow direction is studied to
understand the effect of wall conduction. Wall conduction number (
M
) varies from 0.006 to 0.024 for the range of
parameters selected in the study. Wall conduction is observed to be a direct function of depth and solid-to-fluid thickness
ratio, and varies inversely with angle of diverging microchannel. It is observed that the area variation and wall conduction
contribute separately towards redistribution of the supplied heat flux. This leads to reduced temperature gradients in
diverging microchannel. The results presented in this work will be useful for designing future microdevices involving heating or cooling
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