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Title: Outflow boundary condition for the temperature field in channels with periodically positioned heat sources in the presence of wall conduction

Abstract

The fluid temperature field in channels with conducting walls and flow obstructions is elliptic in the streamwise direction. Traditionally, the channel length is artificially extended, and natural condition is used the outlet boundary condition. However, for the fluid temperature field the use of natural condition (type a) is not appropriate, as the wall conduction and flow obstructions facilitate information propagation in the upstream direction. An alternative boundary condition (type b) at the channel exit is proposed to simulate the fluid temperature field. In the proposed approach, the temperature rise of the fluid in the canal exit region is assumed to be constant. Using both type a and type b boundary conditions heat transfer in a channel with heat-generating blocks and conducting walls was studied. The results of the developing flow problem were compared with the results of the periodically fully developed flow problem. Such a comparison clearly established the superiority of the proposed type b condition.

Authors:
;  [1]
  1. (Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering)
Publication Date:
OSTI Identifier:
7173890
Resource Type:
Journal Article
Journal Name:
Numerical Heat Transfer. Part B, Fundamentals; (United States)
Additional Journal Information:
Journal Volume: 25:2; Journal ID: ISSN 1040-7790
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; HEAT EXCHANGERS; TEMPERATURE GRADIENTS; BOUNDARY CONDITIONS; COMPUTER CALCULATIONS; HEAT TRANSFER; ENERGY TRANSFER; 420400* - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Kim, S.H., and Anand, N.K.. Outflow boundary condition for the temperature field in channels with periodically positioned heat sources in the presence of wall conduction. United States: N. p., 1994. Web. doi:10.1080/10407799408955915.
Kim, S.H., & Anand, N.K.. Outflow boundary condition for the temperature field in channels with periodically positioned heat sources in the presence of wall conduction. United States. doi:10.1080/10407799408955915.
Kim, S.H., and Anand, N.K.. Tue . "Outflow boundary condition for the temperature field in channels with periodically positioned heat sources in the presence of wall conduction". United States. doi:10.1080/10407799408955915.
@article{osti_7173890,
title = {Outflow boundary condition for the temperature field in channels with periodically positioned heat sources in the presence of wall conduction},
author = {Kim, S.H. and Anand, N.K.},
abstractNote = {The fluid temperature field in channels with conducting walls and flow obstructions is elliptic in the streamwise direction. Traditionally, the channel length is artificially extended, and natural condition is used the outlet boundary condition. However, for the fluid temperature field the use of natural condition (type a) is not appropriate, as the wall conduction and flow obstructions facilitate information propagation in the upstream direction. An alternative boundary condition (type b) at the channel exit is proposed to simulate the fluid temperature field. In the proposed approach, the temperature rise of the fluid in the canal exit region is assumed to be constant. Using both type a and type b boundary conditions heat transfer in a channel with heat-generating blocks and conducting walls was studied. The results of the developing flow problem were compared with the results of the periodically fully developed flow problem. Such a comparison clearly established the superiority of the proposed type b condition.},
doi = {10.1080/10407799408955915},
journal = {Numerical Heat Transfer. Part B, Fundamentals; (United States)},
issn = {1040-7790},
number = ,
volume = 25:2,
place = {United States},
year = {1994},
month = {3}
}