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標題:Improvement in Performance of Multi-Pass Laminar Counterflow Heat Exchangers with External Refluxes
學年
學期
出版(發表)日期2002/08/01
作品名稱Improvement in Performance of Multi-Pass Laminar Counterflow Heat Exchangers with External Refluxes
作品名稱(其他語言)
著者Chii-Dong Ho; Ho-Ming Yeh; Yu-Chuan Tsai
單位
出版者
著錄名稱、卷期、頁數International Journal of Heat and Mass Transfer 45(17), pp.3529-3547
摘要A study on improvement in performance of multi-pass rectangular heat exchangers with uniform wall temperature and with external refluxes has been carried out under counterflow operations. An orthogonal expansion technique for solving such a conjugated Graetz problem is developed and applied to investigate a substantially improving heat transfer. A description of the average Nusselt number and the outlet dimensionless temperature is given. It is shown that for asymptotic average Nusselt numbers exit in counterflow as in single-flow operations. Numerical values of asymptotic average Nusselt numbers are reported for a wide range of Graetz numbers. Comparisons of analytical results are made with single-flow operations of the same size (without sheets inserted and without recycle). Considerable improvement in the heat transfer rate for large Graetz numbers is obtainable by introducing the recycle-effect concept in designing such double-pass operations. The effect of sheet location on the enhancement of heat transfer efficiency as well as on the increment of power consumption has been also discussed.
關鍵字
語言英文
ISSN0017-9310;1879-2189
期刊性質國外
收錄於
產學合作
通訊作者Chii-Dong Ho
審稿制度
國別英國
公開徵稿
出版型式,電子版,紙本
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