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dc.contributorJung-Yang Sanen_US
dc.contributor.authorWen-Chieh Huangen_US
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dc.description.abstractThis study investigated the heat transfer enhancement in circular tubes with internal ring-type protrusions. The heat transfer performance of the tubes with the ring-type protrusions was compared to that with a coil spring. In addition, the effect of rib arc (da) on the heat transfer enhancement was determined. Thirteen copper tubes with inner diameter (d) of 13.8 mm and outer diameter of 15.8 mm were used to fabricate the test tubes with a da value of 2 mm. These tubes are different in rib height (e) and rib pitch (p). Three different working fluids, air, water and ethylene glycol-water solution (EG volume ratio = 33.3%), were considered. The heat transfer measurement was conducted in a concentric-tube device. The inner tube is the test tube in which the working fluid passes through, while saturated water vapor passes through the annulus. An isothermal wall model was used to evaluate the average in-tube convection heat transfer coefficient and Nusselt number (Nu). In the pressure drop measurement, the fluid was set at 25 oC and the pressure drop was measured by using a U tube. The measured data were calculated to obtain the Darcy friction factor (f) at various flow rates. Through a correlation analysis, the Nusselt number (Nu) was expressed as a function of e/d, p/d, Reynolds number (Re) and Prandtl number (Pr). The Nu value is proportional to the 0.45 power of the Pr value. The Nu enhancement index (r1) and mechanical energy consumption index (r2) were also obtained by comparing the measued data of the test tubes to those of a smooth tube. Using the data reported in the literature, the dependence of Nu on the da/d and f values was determined. As water is the working fluid, the heat transfer enhancement due to the internal ring-type protrusions is superior to that due to the coil spring; as air is the working fluid, the latter is better than the former.en_US
dc.description.abstract此研究探討具內部突出環節圓管之熱傳增強效果,所得之結果除了與內部具有螺旋彈簧之熱傳增強管進行比較,亦探討環節溝徑(da)對熱傳增強之影響。首先以內徑13.8 mm (d) 與外徑為15.8 mm之光滑圓銅管,製作13支da = 2 mm但具不同環節高度(e)與節徑(p)之熱傳增強管,以進行熱傳性能與壓降之量測,所考慮之工作流體分別為空氣、水與乙二醇水溶液(體積比率 = 0.333)等三種。熱傳量測系統為同心管之型式,內管為測試銅管,其內部通過工作流體,內管與外管間則通過蒸氣,經利用等管壁溫度模式計算量測獲得之溫度,而得到測試管之平均熱對流係數與紐塞數(Nu)。壓降之量測乃利用U型管進行,考慮之流體為25 oC等溫之狀態,量測之資料經計算,而獲得各測試管在不同流量下之摩擦因子(f)。此研究中所獲得之紐塞數經相關性分析而表示為e/d、p/d、雷諾數(Re)與普朗特數(Pr)之函數,結果顯示,Nu值與Pr值之0.45次方成正比;熱傳增強管量測之資料經與光滑圓管量測之資料比較後,亦獲得各支測試管之熱傳增強指數(r1)與機械耗損功率指數(r2)。此研究亦擷取文獻中之資料,而獲得環節溝徑-管徑比(da/d) 與Nu值及f值間之相關性;同時由具環節熱傳增強管與具螺旋彈簧熱傳增強管之比較後顯示,當工作流體為水時,前者熱傳增強效果較佳;當工作流體為空氣時,後者則較佳。zh_TW
dc.description.tableofcontents摘要 i ABSTRACT ii 目錄 iii 表目錄 vii 圖目錄 xiii 符號表示 xv 第一章 緒論 1 1.1 前言 1 1.2文獻回顧 2 1.3研究內容與目的 10 第二章 實驗設備與過程 13 2.1具內部突出環節之製作 13 2.1.1 待測銅管的規格 13 2.1.2 滾輪 13 2.1.3 圓管內部突出環節之製作 13 2.2實驗設備之介紹 14 2.2.1 工作流體為空氣 14 2.2.2 工作流體為水及乙二醇水溶液 16 2.3理論模式 17 2.3.1 Re值的計算公式 17 2.3.2 Nu值的計算公式 17 2.3.3 f值的計算公式 18 2.3.4 管壁溫度之修正 18 2.3.5 熱傳增強指數(r1)與機械能耗損功率指數(r2) 21 2.4 量測過程 22 2.4.1 當工作流體為空氣 22 2.4.2 當工作流體為水及乙二醇水溶液 23 第三章 實驗量測結果與迴歸分析 26 3.1 光滑圓管熱傳量測的結果與比較 26 3.2 以空氣為工作流體之實驗結果 26 3.2.1 空氣之熱傳之相關性分析 26 3.2.2 空氣之摩擦因子之相關性分析 28 3.3 綜合水與乙二醇水溶液後之熱傳和摩擦因子之相關性分析 29 3.3.1 綜合水與乙二醇水溶液後之熱傳之相關性分析 29 3.3.2 綜合水與乙二醇水溶液後之摩擦因子之相關性分析 30 3.4 普朗特數(Pr)對Nu值及f值之影響 30 3.5 考慮環節溝徑(da)之熱傳增強管之熱傳和摩擦因子之相關性分析 31 3.5.1 溝徑之熱傳之相關性分析 31 3.5.2 溝徑之摩擦因子之相關性分析 32 3.6 熱傳量測結果與文獻中資料之比較 33 第四章 螺旋線圈之熱傳增強與環節之熱傳增強之比較 34 4.1具螺旋線圈之熱傳增強管之紐塞數 34 4.1.1 空氣之平均紐塞數之量測結果 34 4.1.2 水之平均紐塞數之量測結果 35 4.2具螺旋線圈之熱傳增強管之摩擦因子 35 4.2.1 空氣之摩擦因子之量測結果 35 4.2.2 水之摩擦因子之量測結果 36 4.3 具螺旋線圈之熱傳增強指數(r1)與機械耗損功率指數(r2) 37 4.3.1 空氣之性能指數 37 4.3.2 水之性能指數 37 4.4 具螺旋線圈之熱傳增強管與具環節之熱傳增強管之比較 38 第五章 實驗量測不準確度(Uncertainty)分析 40 5.1 紐塞數(Nu)之不準確度之分析方法 40 5.2 空氣之不準確度分析結果(Nu值) 42 5.3 水之不準確度分析結果(Nu值) 42 5.4 乙二醇之不準確度分析結果(Nu值) 43 5.5 摩擦因子(f值)之不準確度之分析方法 43 5.6 空氣之不準確度分析結果(f值) 44 5.7 水之不準確度分析結果(f值) 45 第六章 結論 46 6.1 結論 46 6.2未來展望 48 參考文獻 49zh_TW
dc.subjectheat transfer enhancementen_US
dc.subjectring-type protrusionsen_US
dc.subjectNusselt numberen_US
dc.subjectfriction factoren_US
dc.subjectPrandtl numberen_US
dc.titleEffects of Prandtl Number and Rib Shape on Heat Transfer Enhancement in Circular Tubes with Internal Ring-Type Protrusionsen_US
dc.typeThesis and Dissertationen_US
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