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Laminar Friction Factors and Colburn Factors for Ducts with Advanced Boundary Conditions

Yuan, Jinliang LU ; Rokni, Masoud LU and Sundén, Bengt LU (2002) Internatioanl Conference on Compact Heat Exchangers In Compact Heat Exchanges p.113-118
Abstract
Ducts of various geometrical cross sections appear extensively in engineering applications like heat exchangers. In the

available literature analytical, numerical and experimental data are available for the friction factor and the Colburn factor for a

variety of thermal boundary conditions. Results for fully developed cases are commonly available, but also for the thermally

and hydrodynamically developing entrance regions. However, results are not available yet for the cases with advanced

boundary conditions, i.e., having a mixture of uniform heat flux, wall temperature conditions and thermal insulation on the

walls. To complicate the situation further, mass transfer may appear at one or more... (More)
Ducts of various geometrical cross sections appear extensively in engineering applications like heat exchangers. In the

available literature analytical, numerical and experimental data are available for the friction factor and the Colburn factor for a

variety of thermal boundary conditions. Results for fully developed cases are commonly available, but also for the thermally

and hydrodynamically developing entrance regions. However, results are not available yet for the cases with advanced

boundary conditions, i.e., having a mixture of uniform heat flux, wall temperature conditions and thermal insulation on the

walls. To complicate the situation further, mass transfer may appear at one or more walls, and buoyancy effects can be

significant in some applications. Such effects are presented.

This paper presents recent numerical investigations and results from the authors. The origin of these advanced boundary

conditions is not in the pure heat exchanger area, but rather from recent developments in the heat and mass transfer analysis in

the emerging area of fuel cells. The comparison with conventional cases and the discussion of the significance of the advanced

boundary conditions are believed to be of key interest to the heat exchanger community as well. The correlations as function

of aspect ratio, base-angle and wall Reynolds number are included in the paper, and can be applied for design purposes. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Compact Heat Exchanges
editor
Celata, G.P. and
pages
113 - 118
conference name
Internatioanl Conference on Compact Heat Exchangers
language
English
LU publication?
yes
id
0b6089a0-7e13-45de-b70b-ac4b1564fcb3 (old id 621055)
date added to LUP
2008-02-27 09:06:16
date last changed
2016-04-16 11:13:07
@inproceedings{0b6089a0-7e13-45de-b70b-ac4b1564fcb3,
  abstract     = {Ducts of various geometrical cross sections appear extensively in engineering applications like heat exchangers. In the<br/><br>
available literature analytical, numerical and experimental data are available for the friction factor and the Colburn factor for a<br/><br>
variety of thermal boundary conditions. Results for fully developed cases are commonly available, but also for the thermally<br/><br>
and hydrodynamically developing entrance regions. However, results are not available yet for the cases with advanced<br/><br>
boundary conditions, i.e., having a mixture of uniform heat flux, wall temperature conditions and thermal insulation on the<br/><br>
walls. To complicate the situation further, mass transfer may appear at one or more walls, and buoyancy effects can be<br/><br>
significant in some applications. Such effects are presented.<br/><br>
This paper presents recent numerical investigations and results from the authors. The origin of these advanced boundary<br/><br>
conditions is not in the pure heat exchanger area, but rather from recent developments in the heat and mass transfer analysis in<br/><br>
the emerging area of fuel cells. The comparison with conventional cases and the discussion of the significance of the advanced<br/><br>
boundary conditions are believed to be of key interest to the heat exchanger community as well. The correlations as function<br/><br>
of aspect ratio, base-angle and wall Reynolds number are included in the paper, and can be applied for design purposes.},
  author       = {Yuan, Jinliang and Rokni, Masoud and Sundén, Bengt},
  booktitle    = {Compact Heat Exchanges},
  editor       = {Celata, G.P.},
  language     = {eng},
  pages        = {113--118},
  title        = {Laminar Friction Factors and Colburn Factors for Ducts with Advanced Boundary Conditions},
  year         = {2002},
}