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Convective condensation inside horizontal smooth and microfin tubes

Wu, Zan LU ; Sundén, Bengt LU ; Wang, Lei LU and Li, Wei (2014) In Journal of Heat Transfer 136(5).
Abstract
An experimental investigation was performed for convective condensation of R410A

inside one smooth tube (3.78 mm, inner diameter) and six microfin tubes (4.54, 4.6 and

8.98 mm, fin root diameter) of different geometries for mass fluxes ranging from 99 to 603

kg m-2s-1. The experimental data were analyzed with updated flow pattern maps and

evaluated with existing correlations. The heat transfer coefficient in the microfin tubes

decreases at first and then increases or flattens out gradually as mass flux decreases.

This obvious non-monotonic heat transfer coefficient-mass flux relation may be explained

by the complex interactions between the microfins and the fluid, mainly by... (More)
An experimental investigation was performed for convective condensation of R410A

inside one smooth tube (3.78 mm, inner diameter) and six microfin tubes (4.54, 4.6 and

8.98 mm, fin root diameter) of different geometries for mass fluxes ranging from 99 to 603

kg m-2s-1. The experimental data were analyzed with updated flow pattern maps and

evaluated with existing correlations. The heat transfer coefficient in the microfin tubes

decreases at first and then increases or flattens out gradually as mass flux decreases.

This obvious non-monotonic heat transfer coefficient-mass flux relation may be explained

by the complex interactions between the microfins and the fluid, mainly by surface

tension effects. The heat transfer enhancement mechanism in microfin tubes is mainly

due to the surface area increase at large mass fluxes, while liquid drainage by surface

tension and interfacial turbulence enhance heat transfer greatly at low mass fluxes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Heat Transfer
volume
136
issue
5
publisher
American Society Of Mechanical Engineers (ASME)
external identifiers
  • wos:000335816500005
  • scopus:84896760690
ISSN
0022-1481
DOI
10.1115/1.4026370
language
English
LU publication?
yes
id
7cac8fc5-e854-4d29-914f-26ea9b14a4d2 (old id 4285375)
date added to LUP
2014-02-07 10:54:03
date last changed
2017-10-22 03:58:15
@article{7cac8fc5-e854-4d29-914f-26ea9b14a4d2,
  abstract     = {An experimental investigation was performed for convective condensation of R410A<br/><br>
inside one smooth tube (3.78 mm, inner diameter) and six microfin tubes (4.54, 4.6 and<br/><br>
8.98 mm, fin root diameter) of different geometries for mass fluxes ranging from 99 to 603<br/><br>
kg m-2s-1. The experimental data were analyzed with updated flow pattern maps and<br/><br>
evaluated with existing correlations. The heat transfer coefficient in the microfin tubes<br/><br>
decreases at first and then increases or flattens out gradually as mass flux decreases.<br/><br>
This obvious non-monotonic heat transfer coefficient-mass flux relation may be explained<br/><br>
by the complex interactions between the microfins and the fluid, mainly by surface<br/><br>
tension effects. The heat transfer enhancement mechanism in microfin tubes is mainly<br/><br>
due to the surface area increase at large mass fluxes, while liquid drainage by surface<br/><br>
tension and interfacial turbulence enhance heat transfer greatly at low mass fluxes.},
  articleno    = {051504},
  author       = {Wu, Zan and Sundén, Bengt and Wang, Lei and Li, Wei},
  issn         = {0022-1481},
  language     = {eng},
  number       = {5},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  series       = {Journal of Heat Transfer},
  title        = {Convective condensation inside horizontal smooth and microfin tubes},
  url          = {http://dx.doi.org/10.1115/1.4026370},
  volume       = {136},
  year         = {2014},
}