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Heat Transfer Characteristics of Gaseous Flows in Micro-channel with Constant Heat Flux by Chungpyo Hong; Yutaka Asako; Jae-Heon Lee is a Engineering article available to read on EtoBox.

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Two-dimensional compressible momentum and energy equations are solved to obtain the heat transfer characteristics of gaseous flows in parallel-plate micro-channels with CHF (constant heat flux) for no-slip regime. The numerical methodology is based on the Arbitrary-Lagrangian-Eulerian (ALE) method. The computations are performed for channels with constant heat flux which ranges from 10 2 to 10 4 W m -2 . The channel height ranges from 10 to 100 μm and the aspect ratio of the channel length and height is 200. The stagnation pressure, p stg is chosen in such a way that the Mach number at the exit ranges from 0.1 to 0.7. The outlet pressure is fixed at the atmosphere. The heat transfer characteristics in micro-channels are obtained. And comparisons with available experimental values were conducted. The wall and bulk temperatures in microchannels are compared with those of the incompressible flow in the conventional sized parallel plate channel. A correlation for the prediction of the wall temperature of the gaseous flow in the micro-channel is proposed. And supplementary runs with slip boundary conditions for h = 10 μm conducted and slip effect is discussed.

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Author

Chungpyo Hong; Yutaka Asako; Jae-Heon Lee

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1290-0729)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)