淡江大學機構典藏:Item 987654321/53739
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 62819/95882 (66%)
造访人次 : 4004505      在线人数 : 599
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/53739


    题名: 管壁正弦質量通量於迴流型圓形套管質量交換器之效率研究
    其它题名: Improvement in Performance of Double-Pass Laminar Counterflow Concentric-Tube Mass Exchangers under Sinusoidal Wall Fluxes and External Recycle
    作者: 何啟東;劉立謙;陳衛樽;李博鈞
    贡献者: 淡江大學化學工程與材料工程學系
    关键词: 共軛格拉茲問題;套管質量交換器;質傳改善;弗賓納斯法;Conjugated graetz problem;Concentric-tube;Mass transfer;Recycle;Frobenius method
    日期: 2007-09-12
    上传时间: 2011-05-20 09:57:48 (UTC+8)
    摘要: 迴流的裝置在許多的化工程序中對操作方面有著明顯且重要的影響,例如在氣升式反應器或蒸餾塔加入迴流裝置可提高熱傳或質傳效率。本研究是設計圓形管加裝一可滲透且忽略厚度之薄膜,使之成為一組外管壁於正弦質量通量(Sinusoidal wall fluxes)且具有迴流裝置之圓柱同心套管質量交換器。經由質量守恆所推導出的數學模型會產生一組共軛偏微分方程式,利用弗賓納斯(Frobenius)法來求得其近似解後,可獲得其管內濃度分佈及謝塢數(Sherwood number)。本研究探討迴流效應對圓柱同心套管間的質傳效率之影響,再將其結果與單行程質量傳送系統作比較,以驗證二行程系統的質傳提升率。結果顯示,本系統在格拉茲數大時,其效率提昇率有明顯改善,而不同的薄膜位置對質傳效率有較顯著影響。譬如,在本文二行程中,內管進外管出之無迴流模型,當薄膜位置愈接近外管壁時,有最佳的質傳效率。
    A new double-pass mass exchanger with sinusoidal wall fluxes is obtained by inserting a permeable membrane into a circular tube. The device with recycle operation is developed in this study to improve the device performance. The resultant mathematical formulation of such double-pass devices was derived theoretically and the approximation solution was obtained by using the orthogonality principle and Frobenius method. The concentration distribution and mass transfer efficiency were represented graphically, and compared with those in single-pass devices of the same working dimensions. The theoretical predictions show that the considerable improvement of the device performance is obtainable by introducing recycle-effect concept for conducting double-pass operations. The effects of permeable-barrier position and recycle ratio on the mass transfer efficiency as well as on the of power consumption increment have also been discussed.
    關聯: 2007年輸送現象及其應用研討會論文集,4頁
    显示于类别:[化學工程與材料工程學系暨研究所] 會議論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    管壁正弦質量通量於迴流型圓形套管質量交換器之效率研究_中文摘要.docx摘要21KbMicrosoft Word162检视/开启
    管壁正弦質量通量於迴流型圓形套管質量交換器之效率研究_西文摘要.docx摘要21KbMicrosoft Word158检视/开启

    在機構典藏中所有的数据项都受到原著作权保护.

    TAIR相关文章

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