Conjugated Heat Transfer of Power-Law Fluids in Double-Pass Concentric Circular Heat Exchangers with Sinusoidal Wall Fluxes
學年 109
學期 2
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 en
ISSN
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版
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