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

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Numerical Heat Transfer. Part B, Fundamentals; (United States)

DOI:https://doi.org/10.1080/10407799408955915· OSTI ID:7173890

Kim, S H; Anand, N K ^[1]

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1. Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering

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.

• OSTI ID: 7173890
• Journal Information: Numerical Heat Transfer. Part B, Fundamentals; (United States), Journal Name: Numerical Heat Transfer. Part B, Fundamentals; (United States) Vol. 25:2; ISSN 1040-7790; ISSN NHBFEE
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOUNDARY CONDITIONS
COMPUTER CALCULATIONS
ENERGY TRANSFER
HEAT EXCHANGERS
HEAT TRANSFER
TEMPERATURE GRADIENTS