On the constant wall temperature boundary condition in internal convection heat transfer studies including viscous dissipation


AYDIN O., Avci M.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, vol.37, no.5, pp.535-539, 2010 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 37 Issue: 5
  • Publication Date: 2010
  • Doi Number: 10.1016/j.icheatmasstransfer.2009.11.016
  • Title of Journal : INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
  • Page Numbers: pp.535-539
  • Keywords: Viscous dissipation, Constant wall temperature, Adiabatic bulk temperature, Graetz problem, NON-NEWTONIAN FLUIDS, DEVELOPING FORCED-CONVECTION, THERMALLY DEVELOPING FLOW, GRAETZ PROBLEM, POROUS-MEDIUM, SLIP-FLOW, CONDUCTION, DUCTS, MICROCHANNELS, TUBE

Abstract

In this study, viscous heating effect on convective flow in an unheated adiabatic duct is studied analytically and numerically. Two different geometries are considered: circular duct and plane duct between two parallel plates. Two new parameters are defined for internal convection studies: adiabatic wall temperature and adiabatic bulk temperature. Variations of these two parameters with varying intensity of viscous dissipation effect are determined. In view of the results obtained, usage of the constant wall temperature thermal boundary condition when viscous dissipation is included is discussed and questioned. (C) 2010 Elsevier Ltd. All rights reserved.