English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 49633/84879 (58%)
造訪人次 : 7690941      線上人數 : 80
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/987654321/35295


    題名: 迴路式虹吸熱管之增強沸騰結構
    其他題名: Enhanced boiling structure of loop thermosyphon
    作者: 謝志昇;Hsieh, Chih-sheng
    貢獻者: 淡江大學機械與機電工程學系碩士班
    康尚文;Kang, Shung-wen
    關鍵詞: 迴路式虹吸熱管;增強沸騰結構;銅燒結;Loop Thermosyphon;Enhanced Boiling Structure;Sintered Copper
    日期: 2006
    上傳時間: 2010-01-11 06:19:42 (UTC+8)
    摘要: 本研究所設計的迴路式虹吸熱管包含蒸發室(內徑25mm,高度25mm)、冷凝區、汽相流道(外徑6mm)與液相流道(外徑4mm)四個部分,以銅銀硬銲的方式接合。冷凝區的設計包含七個平滑的垂直管(外徑4 mm, 長80mm),其外部尺寸為80mm x 12mm x 104mm。採用三種增強沸騰結構,分別為無燒結結構、厚度1mm與4mm的燒結結構,其長寬尺寸為17.3mm x 17.3mm,銅粉末平均粒徑與孔隙率分別為185.5μm與53.7%,使用甲醇與去離子水為工作流體。探討充填量與增強沸騰結構對於性能影響,經由實驗獲得以下的結論:
    1.在各組實驗測試中,甲醇與去離子水的最佳充填率分別為10%與30%。甲醇比去離子水呈現較低的加熱面溫度。
    2.工作流體為甲醇時,較佳的效能為燒結厚度1mm,充填量為最佳的10%,與無燒結結構比較,其有效降低加熱面溫度平均為9.21℃。
    3.工作流體為去離子水時,較佳的效能為燒結厚度1mm,充填量為最佳的30%,但是厚度4mm的燒結結構與之無太大的差異,與無燒結結構比較,其有效降低加熱面溫度平均為3.50℃。
    4.由實驗結果顯示冷卻水溫度越低,真空度越高其散熱性能越好。
    Abstract:
    The loop thermosyphon in this research paper is consisting of an evaporator (inner diameter 25mm, height 25mm), a condenser, riser (outer diameter 6mm) and downcomer (outer diameter 4mm) are investigated experimentally. All parts are made of copper, and welded together. And most importantly the condenser consists of 7 vertical smooth copper tubes (4 mm OD, 80mm length), and the outer dimensions (90mm x 19mm x 106mm). The experimented shows that there are three types of enhanced boiling structures. The first type evaporator is flat with smooth boiling surface. The others are 17.3mm square, 1mm and 4mm thickness of sintered copper. The average diameter of copper powder and the porosity is 185.5μm and 53.7% respectively while obviously using D.I. water and methanol as working fluid. The experiment was investigated to evaluate the optimum filling ratio of working fluid and the performance of the enhanced boiling sintered copper structure. The results of the successful performance are as follows:
    1.The optimum filling ratio of methanol and D.I. water are 10% and 30% respectively in each experimental test. Methanol always shows a lower Die temperature than D.I. water.
    2.The better performance for using methanol is 1mm thickness sinter with 10% filling ratio. Comparing with the smooth plate and the effect of 1mm sintered copper for temperature of Die, the average reduction was shown 9.21°C with methanol.
    3.The better performance for using D.I. water is used 1mm thickness sinter with 30% filling ratio. Comparing with the smooth plate and the effect of 1mm sintered copper for temperature of Die, the average reduction was indicated 3.50°C with D.I. water. But the performance of 4mm thickness sinter is nearly to 1mm thickness sinter.
    4.The lower the temperature of cooling water and the higher vacuum, which causes to lead the higher performance.
    顯示於類別:[機械與機電工程學系暨研究所] 學位論文

    文件中的檔案:

    檔案 大小格式瀏覽次數
    0KbUnknown167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