原名「台灣學術線上」
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題名:冷卻流體方向效應對多孔性介質槽道熱流特徵之分析     (28點)
Analysis of Coolant Fluid Orientation on Thermo-Fluidic Characteristics of the Porous Channel
著者:鄭澤明(Tzer-Ming, Jeng) ;曾憲中(Sheng-Chung, Tzeng) ;羅婷尹(Ting-Yin, Luo)
出版地區:台灣
出版城市:彰化縣
學科:自科綜合 ; 應科綜合
關鍵字:堆疊銅粒密實床 ; 90度轉彎流 ; 槽寬--粒徑比例 ; 熱傳遞 ; brass-beads packed bed ; 90-deg turned flow ; ratio of channel width to bead diameter ; heat transfer
刊名:建國科大理工期刊
卷期:33卷2期(2014.4)
頁碼:77-90
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

本研究以實驗方法探討90度轉彎流與低槽寬--粒徑比的堆疊銅粒密實床槽道其熱流特性,銅粒之粒徑(d)有三種:2mm、4mm與6mm,槽道為固定尺寸,槽寬--粒徑比例(Dh/d)分別為7.5、3.75、2.5三種,變動參數包括加熱面與雷諾數(Re),結果發現粒徑越小者其摩擦係數(Cf)愈大,而在d=2mm時,直流之Cf略高90度轉彎流,其它粒徑下此兩種流方之Cf則大致相同;而在低Dh/d與大Re時,直流與90度轉彎流系統之紐塞數(Nu)都會先沿槽道軸向遞增,然後才開始遞減至出口;此外,基本上平均紐塞數Nu是以粒徑d=6mm(Dh/d=2.5)為最大,其次是粒徑d=2mm(Dh/d=7.5),粒徑d=4mm(Dh/d=3.75)其Nu值最小,直流系統之Nu會略大於90度轉彎流,尤其是當分析之流道長度縮減時,至於不同加熱面對局部與平均紐塞數的影響並不顯著。
This study experimentally investigated the fluid flow and heat transfer in the brass-beads-packed-bed channel with the 90-deg turned flow and the small ratio of channel width to bead diameter. The diameters (d) of brass beads were 2 mm, 4 mm and 6 mm. The corresponding ratios (Dh/d) of channel width to bead diameter were 7.5, 3.75 and 2.5. The other parameters included the heated surface and Reynolds number. The results indicate that the friction factor (Cf) increased with decreasing the bead diameter. Besides, the Cf values of the straight-flow system were slightly higher than those of the 90-deg-turned-flow system at the cases of d=2 mm, they were similar for the cases of d=4 mm and 6 mm. When the Dh/d was small and the Re was large, the local Nusselt number (Nu) firstly increased along the streamwise direction and then decreased until the exit. Furthermore, the average Nusselt number (Nu) of d=6 mm (Dh/d=2.5) was maximum, and that of d=4 mm (Dh/d=3.75) was minimum. The Nu of d=2 mm was generally medium. The Nu for the straight-flow system was generally higher than that for the 90-deg-turned-flow system, especially for the shorter length of the channel being analyzed. However, the effect of the heated surface on the heat transfer was insignificant.


    

本卷期目次
建國科大理工期刊 33卷2期 (2014.4)
廢熱回收熱電轉換系統中的多孔性集熱器之熱傳特性實驗研究/ 曾憲中鄭澤明李峰陳易辰
運用微特徵模具於微熱壓印製作菲涅爾透鏡之研究/ 郭啟全許修繻
電子裝備冷卻分析/ 黃庭凱
可運用於微熱壓印之一種簡單與低成本之微特徵模具製作方法/ 郭啟全莊伯超
冷卻流體方向效應對多孔性介質槽道熱流特徵之分析/ 鄭澤明曾憲中羅婷尹
去除快速原型件支撐材料之溶液PH值線上檢測技術/ 郭啟全蕭煜騰
 
   
 
   

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