教師資料查詢 | 類別: 期刊論文 | 教師: 何啟東 Ho, Chii-dong (瀏覽個人網頁)

標題:Conjugated Heat Transfer of Power-Law Fluids in Double-Pass Concentric Circular Heat Exchangers with Sinusoidal Wall Fluxes
學年
學期
出版(發表)日期2021/06/22
作品名稱Conjugated Heat Transfer of Power-Law Fluids in Double-Pass Concentric Circular Heat Exchangers with Sinusoidal Wall Fluxes
作品名稱(其他語言)
著者Chii-Dong Ho; Gwo-Geng Lin; Thiam Leng Chew; Li-Pang Lin
單位
出版者
著錄名稱、卷期、頁數Mathematical Biosciences and Engineering, 18(5),p.5592-5613
摘要An analytical formulation, referred to as conjugated Graetz problems, is developed to predict the temperature distribution and Nusselt numbers for the power-law fluid flowing in a double-pass concentric circular heat exchanger under sinusoidal wall fluxes. A new design of inserting an impermeable sheet into a concentric tube, in parallel, to conduct recycling double-pass operations has been studied theoretically in the fully developed region, resulting in substantial improvements in the performance of heat exchanger device. The analytical solution was derived using the complex functions by transforming the boundary value problem into ordinary differential equations with the aid of the Frobenius method. The influences of power-law index and impermeable-sheet position on average Nusselt numbers with various designs and operating parameters are also delineated. The theoretical predictions show that the heat transfer efficiency is considerably improved through operating the double-pass device compared to via a single-pass circular heat exchanger (where an impermeable sheet is not inserted). The economic feasibility of operating double-pass concentric circular heat exchanger for power-law fluids is exemplified by the ratio of the heat-transfer efficiency enhancement and the increment in power consumption. The double-pass effect from increasing the convective heat-transfer coefficient can compensate for the rise in power consumption, which serves as important economic advantage of this design.
關鍵字power-law fluids;sinusoidal wall fluxes;concentric circular heat exchangers;conjugated Graetz problem
語言英文
ISSN
期刊性質國外
收錄於SCI;EI;
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式,電子版
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