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Frictional pressure drop correlations for single-phase flow, condensation and evaporation in microfin tubes

Wu, Zan LU and Sundén, Bengt LU (2015) In Journal of Heat Transfer 138(2). p.1-022901
Abstract
Experimental single-phase, condensation, and evaporation (flow boiling) pressure drop data from the literature and our previous studies were collected to evaluate previous frictional pressure drop correlations for horizontal microfin tubes of different geometries. The modified Ravigururajan and Bergles correlation, by adopting the Churchill model to calculate the smooth-tube friction factor and by using the hydraulic diameter in the Reynolds number, can predict single-phase turbulent frictional pressure drop data relatively well. Eleven pressure drop correlations were evaluated by the collected database for condensation and evaporation. Correlations originally developed for condensation and evaporation in smooth tubes can be suitable for... (More)
Experimental single-phase, condensation, and evaporation (flow boiling) pressure drop data from the literature and our previous studies were collected to evaluate previous frictional pressure drop correlations for horizontal microfin tubes of different geometries. The modified Ravigururajan and Bergles correlation, by adopting the Churchill model to calculate the smooth-tube friction factor and by using the hydraulic diameter in the Reynolds number, can predict single-phase turbulent frictional pressure drop data relatively well. Eleven pressure drop correlations were evaluated by the collected database for condensation and evaporation. Correlations originally developed for condensation and evaporation in smooth tubes can be suitable for microfin tubes if the friction factors in the correlations were calculated by the Churchill model to include microfin effects. The three most accurate correlations were recommended for condensation and evaporation in microfin tubes. The Cavallini et al. correlation and the modified Friedel correlation can give good predictions for both condensation and evaporation. However, some inconsistencies were found, even for the recommended correlations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Heat Transfer
volume
138
issue
2
pages
1 - 022901
publisher
American Society Of Mechanical Engineers (ASME)
external identifiers
  • scopus:84940974396
ISSN
0022-1481
DOI
10.1115/1.4031268
language
English
LU publication?
yes
id
d375a12a-4da8-49dc-8b04-2b196ad322f6 (old id 8312426)
date added to LUP
2015-12-16 10:21:38
date last changed
2017-09-10 03:54:35
@article{d375a12a-4da8-49dc-8b04-2b196ad322f6,
  abstract     = {Experimental single-phase, condensation, and evaporation (flow boiling) pressure drop data from the literature and our previous studies were collected to evaluate previous frictional pressure drop correlations for horizontal microfin tubes of different geometries. The modified Ravigururajan and Bergles correlation, by adopting the Churchill model to calculate the smooth-tube friction factor and by using the hydraulic diameter in the Reynolds number, can predict single-phase turbulent frictional pressure drop data relatively well. Eleven pressure drop correlations were evaluated by the collected database for condensation and evaporation. Correlations originally developed for condensation and evaporation in smooth tubes can be suitable for microfin tubes if the friction factors in the correlations were calculated by the Churchill model to include microfin effects. The three most accurate correlations were recommended for condensation and evaporation in microfin tubes. The Cavallini et al. correlation and the modified Friedel correlation can give good predictions for both condensation and evaporation. However, some inconsistencies were found, even for the recommended correlations.},
  author       = {Wu, Zan and Sundén, Bengt},
  issn         = {0022-1481},
  language     = {eng},
  number       = {2},
  pages        = {1--022901},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  series       = {Journal of Heat Transfer},
  title        = {Frictional pressure drop correlations for single-phase flow, condensation and evaporation in microfin tubes},
  url          = {http://dx.doi.org/10.1115/1.4031268},
  volume       = {138},
  year         = {2015},
}