波浪狀鰭片之熱流特性分析

Heat Transfer and Flow Friction Characteristics of Herringbone Wavy Fin-and-Tube Heat Exchangers

黃永明(Young-Ming Hwang)

指導教授 ： 林育才

元智大學/工程學院/機械工程學系/碩士(2001年)

摘要

在本研究中，針對16個鯡骨狀波浪型鰭管式熱交換器進行測試。發現管排數和鰭片間隔對Type Ⅰ ( , )熱交換器性能影響並不大，尤其是高雷諾數時，更是明顯;但對Type Ⅱ( , )之熱交換器卻有相當大的影響。在兩組型式熱交換器中，發現在低雷諾數時，有”最大現象”的情形發生，尤其是多管排數和較小的鰭片間隔時，此現象更容易發生。
在熱傳及摩擦性能經驗式上，總共有61組熱交換器，大約570點的資料藉著線性回歸技巧及嘗試錯誤法分析，而求得其經驗式。其中熱傳因子j誤差在 %以內的佔全部數據91.3%，平均誤差為6.98%;而摩擦係數f誤差在 %以內的佔全部數據的84.6%，平均誤差為8.82%。

關鍵字

鰭管式熱交換器

並列摘要

In the present study, sixteen herringbone wavy fin-and-tube heat exchangers were tested. For type Ⅰ exchangers ( , ), the effect of tube row and fin spacing on the air-side performance is not significant; while the effect is pronounced at high Reynolds number. However, the effect of tube row and fin spacing on the air-side performance is very important for type Ⅱ heat exchangers ( , ). In these two types of heat exchangers, the maximum phenomenon was found at low Reynolds number, especially for heat exchangers with larger number of tube rows and smaller fin spacing.
Besides, this study also presents an empirical correlation describing the air-side performance of herringbone wavy fin pattern. A total of 61 samples containing approximately 570 data points are used in the regression analysis and try-and-error method. The proposed heat transfer correlation can describe 91.3% of the test data within ±15% with a mean deviation of 6.98% while the proposed friction correlation can describe 84.6% of the database within ±15% with a mean deviation of 8.82%.

並列關鍵字

HASH(0xdaaf890)

參考文獻

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