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Condensation and evaporation heat transfer characteristics in horizontal smooth, herringbone and enhanced surface EHT tubes

Guo, Si-pu; Wu, Zan LU ; Li, Wei; Kukulka, David; Sundén, Bengt LU ; Zhou, Xiao-peng; Wei, Jin-jia and Simon, Terrence (2015) In International Journal of Heat and Mass Transfer 85. p.281-291
Abstract
An experimental investigation was performed to evaluate convective condensation and evaporation of R22, R32 and R410A inside a smooth tube (inner diameter 11.43 mm), a herringbone tube (fin root diameter 11.43 mm) and a newly developed enhanced surface EHT tube (inner diameter 11.5 mm) at low mass fluxes. The inner surface of the EHT tube is enhanced by dimple/protrusion and secondary petal arrays. For condensation, the heat transfer coefficient of the herringbone tube is 2.0-3.0 times larger than a smooth tube and the EHT tube is 1.3-1.95 times that of the smooth tube. The heat transfer enhancement ratios of the herringbone tube and the EHT tube are larger than their respective inner surface area ratios. Mass flux has a non-monotonic... (More)
An experimental investigation was performed to evaluate convective condensation and evaporation of R22, R32 and R410A inside a smooth tube (inner diameter 11.43 mm), a herringbone tube (fin root diameter 11.43 mm) and a newly developed enhanced surface EHT tube (inner diameter 11.5 mm) at low mass fluxes. The inner surface of the EHT tube is enhanced by dimple/protrusion and secondary petal arrays. For condensation, the heat transfer coefficient of the herringbone tube is 2.0-3.0 times larger than a smooth tube and the EHT tube is 1.3-1.95 times that of the smooth tube. The heat transfer enhancement ratios of the herringbone tube and the EHT tube are larger than their respective inner surface area ratios. Mass flux has a non-monotonic relation with the condensation heat transfer coefficient in the herringbone microfin tubes; this was especially evident for R32 and R410A. For evaporation, the EHT tube provides the best evaporation heat transfer performance for all the three refrigerants; this is mainly due to the heat transfer enhancement produced from the larger number of nucleation sites, increased interfacial turbulence, boundary layer disruption, flow separation and secondary flow generation caused by the dimple and petal arrays. The evaporation heat transfer coefficient of the herringbone tube is only slightly higher than that of the smooth tube. Overall, the EHT tube provides increased heat transfer enhancement for both condensation and evaporation. (C) 2015 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Herringbone tube, Condensation, Evaporation, Heat transfer enhancement
in
International Journal of Heat and Mass Transfer
volume
85
pages
281 - 291
publisher
Pergamon
external identifiers
  • wos:000353249000024
  • scopus:84923256935
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2015.01.115
language
English
LU publication?
yes
id
c2598eb1-fd95-436c-9759-d5b84c692cf3 (old id 5385978)
date added to LUP
2015-05-18 13:50:18
date last changed
2017-10-01 03:21:53
@article{c2598eb1-fd95-436c-9759-d5b84c692cf3,
  abstract     = {An experimental investigation was performed to evaluate convective condensation and evaporation of R22, R32 and R410A inside a smooth tube (inner diameter 11.43 mm), a herringbone tube (fin root diameter 11.43 mm) and a newly developed enhanced surface EHT tube (inner diameter 11.5 mm) at low mass fluxes. The inner surface of the EHT tube is enhanced by dimple/protrusion and secondary petal arrays. For condensation, the heat transfer coefficient of the herringbone tube is 2.0-3.0 times larger than a smooth tube and the EHT tube is 1.3-1.95 times that of the smooth tube. The heat transfer enhancement ratios of the herringbone tube and the EHT tube are larger than their respective inner surface area ratios. Mass flux has a non-monotonic relation with the condensation heat transfer coefficient in the herringbone microfin tubes; this was especially evident for R32 and R410A. For evaporation, the EHT tube provides the best evaporation heat transfer performance for all the three refrigerants; this is mainly due to the heat transfer enhancement produced from the larger number of nucleation sites, increased interfacial turbulence, boundary layer disruption, flow separation and secondary flow generation caused by the dimple and petal arrays. The evaporation heat transfer coefficient of the herringbone tube is only slightly higher than that of the smooth tube. Overall, the EHT tube provides increased heat transfer enhancement for both condensation and evaporation. (C) 2015 Elsevier Ltd. All rights reserved.},
  author       = {Guo, Si-pu and Wu, Zan and Li, Wei and Kukulka, David and Sundén, Bengt and Zhou, Xiao-peng and Wei, Jin-jia and Simon, Terrence},
  issn         = {0017-9310},
  keyword      = {Herringbone tube,Condensation,Evaporation,Heat transfer enhancement},
  language     = {eng},
  pages        = {281--291},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Condensation and evaporation heat transfer characteristics in horizontal smooth, herringbone and enhanced surface EHT tubes},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.01.115},
  volume       = {85},
  year         = {2015},
}