Entropy generation in a rectangular packed duct with wall heat flux
type: Item
instance of: scholarly article
title: Entropy generation in a rectangular packed duct with wall heat flux
zbMATH Open document ID: 0971.76080
DOI: 10.1016/S0017-9310(98)00324-X
author: R. Kahraman
author: Y. Demirel
published in: International Journal of Heat and Mass Transfer
publication date: 2001-11-01T00:00:00Z
review text: This paper studies the entropy generation due to heat transfer and friction for fully developed forced convection flow in a large rectangular duct, packed with spherical particles, with constant heat fluxes applied to both the top (heated) and bottom (cooled) wall. An approximate analytical expression for the velocity profile developed for packed bed with \(H/d_p>5\) (\(H\) is the depth of duct, and \(d_p\) is the diameter of packing) is used together with the energy equation for fully developed flow to calculate the non-isothermal temperature profiles along the flow passage. The effects of wall region \((H/d_p)\) and thermal boundary conditions on the entropy generation are displayed in figures in a qualitative and quantitative manner. It is found that the velocity distortion near the walls destroys the uniformity in the entropy generation and the irreversibility of distributions in the packed bed. The distortions in the wall regions are larger for higher values of \(H/d_p\). This is in agreement with the results from the literature.
Mathematics Subject Classification ID: 76R05
Mathematics Subject Classification ID: 80A20
zbMATH DE Number: 1436804
zbMATH Keywords: constant wall heat flux
zbMATH Keywords: entropy generation
zbMATH Keywords: heat transfer
zbMATH Keywords: friction
zbMATH Keywords: forced convection
zbMATH Keywords: rectangular duct
zbMATH Keywords: spherical particles
zbMATH Keywords: velocity profile
zbMATH Keywords: non-isothermal temperature profiles
zbMATH Keywords: velocity distortion
reviewed by: Ioan Pop
MaRDI profile type: Publication
full work available at URL: s0017-9310(98)00324-x
OpenAlex ID: W2118621774
description: scientific article; zbMATH DE number 1436804