Experimental Investigation of Effect of Corrugation Angle on Local Heat Transfer Characteristics of a Corrugated Plate
張志全、吳佩學
E-mail: [email protected]
ABSTRACT
Heat exchanger can be used and applied to a very extensive range. The most typical and common applications of the heat transfer enhancement are on the plate heat exchange. So far, most of the plate heat exchanger research and analysis are focused on the total pressure drop and the heat transfer coefficient. According to this method, you can only adapt the benchmarks of the total pressure drop or heat transfer coefficient. Meanwhile, the numerical calculation data is significantly different from the actual experimental results. Furthermore, the measurement of the full –wall convective heat transfer coefficient is still less reference for public
documents.Therefore, the following experiments are aimed at different angles (30°,45°,60° ) wave plate flow channel in full wall heat transfer coefficient distribution of the measured data to come out the results.At the same time, they are adapted the different corrugation angles’ and the different Reynolds numbers’ circumstances to evaluate the conditions of the channel full wall convection heat transfer coefficients and pressure drop. The results show that the average Nusselt number of the entrance are vulnerable to the influence of plate geometry of the poor reliability of it value on the plate. And the differences of the two plates’
average Nusselt values’ high and low are changed by the corrugation angle of the grain direction and direction of flowing of the folder. In the other words, when the substances are accumulated to flow from the exit of the up board, Nusselt value is up. But when the substances didn’t flow from the exit of the down board, Nusselt value is down.
Keywords : plate heat exchangers、corrugated angle、transient liquid crystal technology、local heat transfer coefficient Table of Contents
封面內頁 簽名頁 中文摘要 ... iii ABSTRACT ... iv 致謝
... vi 目錄 ... vii 圖目錄 ... x 表目錄
... xvi 符號說明 ... xvii 第一章 緒論 ... 1 1.1研究背景 ... 1 1.2 研究目的 ... 3 1.3 文獻回顧 ... 4 第二章 實驗系統與 研究方法 ... 12 2.1實驗系統 ... 12 2.1.1褶紋角波型板片設計 ... 12 2.1.2高壓 熱風機 ... 15 2.1.3流量計 ... 16 2.1.4快速切換閥 ... 16 2.1.5穩壓艙 ... 16 2.1.6差壓指示計 ... 17 2.2實驗儀器校正 ... 17 2.2.1 熱偶校正 ... 17 2.2.2影像處理系統及程序 ... 19 2.2.3 液晶校正系統與校正曲線 ... 20 2.2.4 流量 計校正 ... 25 2.3 實驗步驟 ... 27 2.4 研究方法 ... 28 第三章 數據分 析 ... 36 3.1特徵尺寸 ... 36 3.2截面帄均容積溫度 ... 37 3.3壓力係 數Cp與摩擦因子f ... 38 3.4科本因子 ... 39 第四章 結果與討論 ... 40 4.1 帄均紐賽數結果 ... 40 4.2 局部紐賽數結果 ... 41 4.2.1褶紋角30度之結果 ... 41 4.2.2褶紋角45度之結果 ... 42 4.2.3褶紋角60度之結果 ... 43 4.3 雷諾數影響 ... 44 4.4 褶紋角影響 ... 45 4.5 壓降係數與壓降因子 ... 47 4.6 j/f ... 48 4.7 實驗數值不準度分析 ... 49 第五章 結論 ... 50 參考文獻 ... 53 附錄一 ... 136 附錄二 ... 152 附錄三 ... 155 REFERENCES
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