Convective condensation inside horizontal smooth and microfin tubes
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4285375
- author
- Wu, Zan LU ; Sundén, Bengt LU ; Wang, Lei LU and Li, Wei
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Heat Transfer
- volume
- 136
- issue
- 5
- article number
- 051504
- 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
- 2016-04-01 12:51:33
- date last changed
- 2022-04-21 18:22:14
@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.}},
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}},
doi = {{10.1115/1.4026370}},
volume = {{136}},
year = {{2014}},
}