Title: Wall effect on heat transfer from a micro-cylinder in near-wall shear flow
Authors: Shi, Jun Mei
Breuer, Michael  
Durst, Franz
Language: en_US
Subject (DDC): DDC - Dewey Decimal Classification::000 Informatik, Wissen, Systeme
DDC - Dewey Decimal Classification::500 Naturwissenschaften
DDC - Dewey Decimal Classification::600 Technik
Issue Date: 2002
Publisher: Elsevier
Document Type: Article
Source: In: International journal of heat and mass transfer. - Amsterdam [u.a.] : Elsevier, ISSN 0017-9310, ZDB-ID 240652-4 - Bd. 45.2002, 6, S. 1309-1320, insges. 12 S
Journal / Series / Working Paper (HSU): International journal of heat and mass transfer 
Volume: 45
Issue: 6
Page Start: 1309
Page End: 1320
Pages: 1309-1320
Publisher Place: Amsterdam
Abstract: 
A two-dimensional numerical study on the heat transfer from small cylinders in near-wall shear flow was carried out taking the conjugated heat conduction in the solid wall into account. The finite volume flow solver (FASTEST-2D) enhanced with multigrid acceleration and the local grid refinement technique was used to achieve efficient computations and accurate numerical results. The effects of the wall thermal conductivity (10-2 ≤ k*w ≤ 104) on the heat transfer from a cylinder under different flow conditions (the shear parameter G* = 0.0033, 0.1, 0.1 and the cylinder Reynolds number 10-3 ≤ ReD ≤ 1.0) were investigated in detail. The cylinder to wall distance was varied in the range 0.1 ≤ Y+ ≤ 10 to cover the influence range of the wall effect. It was found that the wall material even of low conductivity, such as mirror glass and Perspex, still has a dominant influence on the heat transfer rate from the cylinder in the vicinity of a wall. However, when Y+ is above 5.0, the wall effect becomes minor and the average heat loss rate of the cylinder depends only on the cylinder Reynolds number while the shear parameter influences the local Nusselt number distribution. Different heat exchange processes of the fluid and the solid wall were found between materials of high and low conductivities. Based on the numerical results and with the help of dimensional analysis, the physical mechanism of the hot-wire near-wall correction was further revealed. © 2002 Elsevier Science Ltd. All rights reserved.
Organization Units (connected with the publication): Universität Erlangen-Nürnberg 
URL: https://api.elsevier.com/content/abstract/scopus_id/0037127058
ISSN: 00179310
DOI: 10.1016/S0017-9310(01)00225-3
Appears in Collections:Publications of the HSU Researchers (before HSU)

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