English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 51510/86705 (59%)
造訪人次 : 8263502      線上人數 : 86
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/987654321/111324


    題名: 冪次流體於固定壁溫及熱通量混合邊界下平板式二行程熱交換器之熱傳研究
    其他題名: Study on the heat transfer for the power-law fluids through a double-pass parallel-plate device with hybrid boundary condition
    作者: 廖囿星;Liao, Yu-Hsing
    貢獻者: 淡江大學化學工程與材料工程學系碩士班
    林國賡;Lin, Gwo-Geng
    關鍵詞: 格拉茲問題;熱交換器;二行程;冪次律流體;Power-law;double-pass;Heat Exchanger;Heat-Transfer
    日期: 2016
    上傳時間: 2017-08-24 23:49:55 (UTC+8)
    摘要: 本研究運用冪次流體作為工作流體,設計一可忽略熱阻之鋁板於兩平行板間並加入迴流裝置,使之成為一邊為固定壁溫度,另一邊為固定熱通量之二行程平板型熱交換器。此系統所推導之統制方程式屬於共軛格拉茲問題 (conjugated Graetz problem),並運用分離變數法、重疊原理(superposition)及正交展開法(orthogonal expansion technique),求得於一邊固定壁溫與另一邊固定熱通量混合型邊界條件下之解析解。此外,在理論推導過程中,另定義一包含兩端邊界條件之無因次數(β),其可明顯的影響熱交換器之出口溫度,其值主要決定於一端壁加熱功率以及進口流體溫度與另一邊壁溫差之比值。本研究探討流體冪次指數、迴流比大小、β值、隔板位置等參數對熱傳之影響。結果顯示實驗與理論計算值相符合,並且兩端邊界條件β值越大或流體冪次指數越小時,具有較高的熱傳效率。
    The heat-transfer Graetz problem of a double-pass parallel-plate heat exchanger for the power-law flow subject to the hybrid boundary condition, was investigated theoretically. An impermeable barrier without thermal resistance was placed between two parallel plates, whose thermal boundaries were preset at constant temperature at one side, and constant heat flux at the other; it is called the hybrid boundary condition. In order to enhance the device performance, the recycle operation was designed between the flows in the two subchannels. The mathematical model was solved analytically using the separation of variables, together with the superposition principle and an orthogonal expansion in the power series. A dimensionless number (β) is defined as the ratio of the temperature difference between the inlet-flow and the wall at one side over the heat flux at the other side. Both theβvalue and the recycle ratio can render significant influences on the heat transfer efficiency and thus the outlet temperature from the heat exchanger. The experiments were conducted to justified the theoretical simulations. Both the theoretical and experimental results showed that the power law indices play little effect on the heat transfer of the double-pass heat exchanger in this study.
    顯示於類別:[化學工程與材料工程學系暨研究所] 學位論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML25檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

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