Numerical study of gaseous microchannel flows on the dimensional and physical effects

Kuan Hung Lin, Jiunn Chi Wu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this article, we perform a series of simulations to analyze the gaseous flow in two-dimensional (2D) and three-dimensional (3D) microchannels. The geometry effects of entrance and exit, applied pressure ratios and rarefaction effects on the flow characteristics are thoroughly investigated. In addition, a modified Poiseuille number correlation for air flows is obtained. This calculation solves the compressible Navier-Stokes and energy equations under velocity slip and temperature jump conditions with varying inlet to outlet pressure ratios (from 1.76 to 20), the outlet Knudsen numbers (from 0 to 0.22) and the aspect ratios (from 0 to 0.47). The calculated mass flow rate, pressure distribution and friction factor are compared with analytic solutions and experimental data in both the slip flow and earlier transition flow regimes. In the case of higher applied pressure ratio, both experiments and numerical modeling show pressure drop at upstream and downstream. Finally, we discuss the adequacy of the friction factor correlation for the 2D flow and the 3D flow in microchannels with both inlet and outlet chambers.

Original languageEnglish
Title of host publicationProceedings of the 7th International Conference on Nanochannels, Microchannels, and Minichannels 2009, ICNMM2009
Pages391-396
Number of pages6
EditionPART A
DOIs
StatePublished - 2009
Event7th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2009 - Pohang, Korea, Republic of
Duration: 22 Jun 200924 Jun 2009

Publication series

NameProceedings of the 7th International Conference on Nanochannels, Microchannels, and Minichannels 2009, ICNMM2009
NumberPART A

Conference

Conference7th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2009
Country/TerritoryKorea, Republic of
CityPohang
Period22/06/0924/06/09

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