淡江大學機構典藏:Item 987654321/34894
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 62805/95882 (66%)
造访人次 : 3919212      在线人数 : 581
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/987654321/34894


    题名: 具固定質量通量和迴流效應的平板式二行程層狀逆流型質量交換器效率改善之研究
    其它题名: Improvement in performance on double-pass laminar counterflow mass exchangers with external recycle and uniform wall fluxes.
    作者: 傅俊傑;Fu, Jiun-jiau
    贡献者: 淡江大學化學工程與材料工程學系碩士班
    何啟東;Ho, Chii-dong
    关键词: 共軛格拉茲問題;外部迴流;平板;正交展開法;固定質量通量;conjugated Graetz problem;external refluxes;parallel flat-plate;Orthogonal expansion techniques;uniform wall fluxes
    日期: 2005
    上传时间: 2010-01-11 05:44:34 (UTC+8)
    摘要: 本研究針對於質傳問題發生在固定質量通量且具有迴流效應之平板型質量交換器的共軛格拉茲系統，並建立數學模型及求得其解析解。此系統以分離變數法(separation of variables)及重疊理論(superposition method)，且利用正交展開法(orthogonal expansion technique)，求其濃度分佈及平均謝塢數(Sherwood number)，同時亦探討迴流效應對平板式質量交換器之質傳效率的影響，並將其質量傳送效率之改善與單行程系統作比較。
    在本文中，主要探討設計參數(即迴流型式、薄膜位置及薄膜穿透度)與操作參數(即迴流量及體積流速)對平板型質量交換器之影響。結果顯示，本系統在質傳格拉茲數較大時，管壁上的濃度降低及兩端濃度變化量較小，將有利於材料的選擇，而不同的薄膜位置及薄膜的穿透率亦對質傳效率有顯著影響。再者，對不同迴流型式與迴流比值在不同薄膜位置的能源消耗也將與單行程系統作一番比較，以探討平板型質量交換器之最佳設計與操作條件。
    A new device of the double-pass mass exchanger is to divide a parallel flat-plate channel by inserting a permeable barrier into two subchannels with external refluxes under uniform wall mass fluxes. The resultant mathematical formulation of such a double-pass device, referred to conjugated Graetz problems, was developed theoretically. The analytical solution was obtained by using the superposition principle and an orthogonal expansion technique in power series. The concentration distribution and mass transfer efficiency were represented graphically, and compared with those in single-pass devices (without a permeable barrier inserted) of the same working dimension. The results show that the concentration gradient on the wall can be significantly reducing by introducing recycle operations for double-pass mass-exchangers. The effects of permeable-barrier position and recycle ratio on the mass transfer efficiency as well as on the increment of power consumption have also been discussed.
    显示于类别:[化學工程與材料工程學系暨研究所] 學位論文

    文件中的档案:

    档案 大小格式浏览次数
    0KbUnknown375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