English  |  正體中文  |  简体中文  |  Items with full text/Total items : 60696/93562 (65%)
Visitors : 1044219      Online Users : 31
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/46047

    Title: Numerical analysis of gas flow in microchannels
    Authors: Chen, Ching Shung;Lee, S. M.;Sheu, J. D.
    Contributors: 淡江大學航空太空工程學系
    Keywords: Boundary conditions;Computer simulation;Helium;Mathematical models;Nitrogen;Numerical analysis;Pressure;Reynolds number;Velocity;Knudsen number;Microchannel;Microchannel flow;Pressure gradient;Slip flow;Channel flow
    Date: 1998-05
    Issue Date: 2013-03-20 16:27:42 (UTC+8)
    Publisher: Philadelphia: Taylor & Francis Inc.
    Abstract: The present work studies numerically gas flaw in microchannels. The working fluids art nitrogen and helium, and their Knudsen numbers at the channel outlet are 0.055 and 0.165, respectively. The proposed model assumes the fluid is a continuum but employs a slip boundary condition on the channel wall. The results of the present study reveal some interesting features of microchannel flows. First, because of the extraordinarily small dimensions, a large pressure gradient is required to drive the flow. Although the pressure gradient is large, the velocity remains very small in the cases studied owing to the high shear stress at the wall. In the nitrogen flows studied, the maximum u velocity is only 1,16 m /s for a pressure ratio of 2.701. Second, since the Reynolds numbers are small, of the order of 10-310-2 for the flows simulated, they can be safely assumed to be laminar. Third, gas flow in microchannels is typically classified into one of four flow regions: continuum flow, slip flow, transition flow, and free molecular flow. The present study covers the slip flow. The differences between numerical results and experimental data are within 1.15% for pressure and 3.13% for mass flow rate. This indicates that the proposed model is able to predict microchannel flows operating in the slip flow region.
    Relation: Numerical Heat Transfer, Part A: Applications 33(7), pp.749-762
    DOI: 10.1080/10407789808913964
    Appears in Collections:[Graduate Institute & Department of Aerospace Engineering] Journal Article

    Files in This Item:

    File SizeFormat

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback