Journal of Applied Science and Engineering

Published by Tamkang University Press

1.30

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2.10

CiteScore

Chii-Dong Ho  1, Gwo-Geng Lin1, Jing-Min Tang2, Li-Chien Liu1, Li-Pang Lin1 and Jr-Wei Tu1

1Department of Chemical and Materials Engineering, Tamkang University, New Taipei City, Taiwan 25137, R.O.C.
2Department of Aerospace Engineering, Tamkang University, New Taipei City, Taiwan 25137, R.O.C.


 

Received: January 21, 2019
Accepted: May 16, 2019
Publication Date: September 1, 2019

Download Citation: ||https://doi.org/10.6180/jase.201909_22(3).0002  

ABSTRACT


The influences of external recycle at the ends on double-pass laminar counterflow concentrictube massexchangers with sinusoidal wall flux distribution are investigated analytically. An analytical method is proposed to obtain a general solution by using the complex functions in combining the original boundary value problem into an ordinary differential equation with the aid of Frobenius method. Theoretical results show that a suitable adjustment of the permeable-barrier position can effectively enhance the masstransfer rate, leading to an improved device performance in masstransfer efficiency as compared with that in the single-pass operation (without a permeable barrier inserted in parallel into a circular tube). The mass-transfer efficiency enhancement due to the desirable effect of forced-convection increment in two flow patterns of double-pass devices has been illustrated with the recycle ratio, mass-transfer Graetz number, permeable-barrier location and dimensionless permeablebarrier parameter as parameters.


Keywords: Sinusoidal Wall Fluxes, Orthogonal Expansion Technique, Double-pass Operation, Mass Exchanger, Recycle


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