Double-pass flow heat transfer in a circular conduit by inserting a concentric tube for improved performance

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Title:	Double-pass flow heat transfer in a circular conduit by inserting a concentric tube for improved performance
Authors:	Ho, Chii-dong;葉和明;Yeh, Ho-ming;Yang, Wen-yi
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	Concentric tubes;Double-flow operations;Heat transfer
Date:	2005-02-01
Issue Date:	2010-03-09 10:08:49 (UTC+8)
Publisher:	Taylor & Francis Inc.
Abstract:	A double-flow laminar counterflow heat exchanger device is an open circular tube divided into two subchannels with uniform wall temperature, inserted in parallel into an impermeable, resistless tube. Heat transfer performance was considerably improved, compared with an open circular tube (without an impermeable, resistless tube inserted), using an orthogonal expansion technique with eigenfunction power series expansion. The impermeable tube location can effectively enhance the heat transfer efficiency, leading to improved performance. The dimensionless outlet temperature and average Nusselt number decrease with increasing Graetz number (Gz) as the subchannel thickness ratio (κ) moves away from 0.5, especially for κ > 0.5, for flow pattern A. Heat transfer rate improvement occurs for flow pattern B for any Graetz number with κ < 0.6. The power consumption increment is also delineated.
Relation:	Chemical engineering communications 192(2), pp.237-255
DOI:	10.1080/00986440590473344
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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