English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 56830/90529 (63%)
造訪人次 : 12253922      線上人數 : 77
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/35312

    題名: 以直接模擬蒙地卡羅法模擬微流道之氣體流場與熱傳特性分析探討
    其他題名: The investigation of fluid dynamics and heat transfer of micro-channel flows using DSMC simulation
    作者: 潘穎哲;Pan, Ying-jhe
    貢獻者: 淡江大學機械與機電工程學系碩士班
    洪祖昌;Hong, Zuu-chang
    關鍵詞: 直接模擬蒙地卡羅法;微機電系統;微管;DSMC;MEMS;microchannel
    日期: 2009
    上傳時間: 2010-01-11 06:20:53 (UTC+8)
    摘要: 近年來由於工業的發展及半導體工業的成熟,相關領域的產品與物件都具有低成本、高精確度與運作快速等特性。微機電系統(Micro-Electro-Mechanical Systems, MEMS)的尺寸都與分子平均自由徑同等級甚至更小。在稀薄度氣體流場得分析中數值模型須考慮分子觀點。直接模擬蒙地卡羅(Direct simulation Monte Carlo, DSMC)法是目前被認為較精確且使用最廣泛的方法。
    Due to the development and maturation of the semiconductor industry in recent year, the products of related fields are low-cost, high-accurate and high-speed. The characteristic size of Micro-Electro-Mechanical Systems (MEMS) is in the same order as or even smaller than the mean free path (MFP) of gas molecules. In rarefied-gas flow, a mathematical model, which bases on the molecular point of view, has to be considered in the predictions of flow dynamics. The direct simulation Monte Carlo (DSMC) method is a popular and accurate simulation technique for rarefied-gas flows.
    In this thesis, the DSMC method was applied to analyze microchannels which are the most important elements of MEMS. At first, we simulate a 2-D straight rectangular cross-section microchannel using the DSMC method. To study the influence of rarefaction effects on the flow properties, the DSMC results are compared with the numerical solutions of Navier-Stokes equations with slip boundary conditions. The discrepancy between the DSMC results and the Navier-Stokes solutions becomes more obvious when the degree of rarefaction increases. The results show that we must use the DSMC method in rarefied-gas flows to get more accurate results.
    In order to reduce the computation time and memory requirement, the 2-D simplification of a 3-D flow problem is often used in the DSMC simulation. In practical engineering applications, this simplification, however, is inappropriate as the cross-section aspect ratio of the 3-D structure decreases. We simulated the 3-D straight rectangular cross-section microchannels, the 3-D microchannels with microstructures and the 3-D microchannels with backward-facing steps. The results of the 3-D structures are compared with those of 2-D simplifications. It is found that the approaching level of the 3-D results to those of the 2-D simplification is over 98 % when the cross-section aspect ratio is greater than 5. When the cross aspect ratio is less than 5, the influence of 3-D effect can no longer be ignored and it is necessary to use a full 3-D simulation in the analysis of microchannel flows.
    顯示於類別:[機械與機電工程學系暨研究所] 學位論文


    檔案 大小格式瀏覽次數



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