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Experimental investigation of condensation in micro-fin tubes of different geometries

Li, Guan-Qiu; Wu, Zan LU ; Li, Wei; Wang, Zhi-Ke; Wang, Xu; Li, Hong-Xia and Yao, Shi-Chune (2012) In Experimental Thermal and Fluid Science 37(February). p.19-28
Abstract
An experimental investigation was performed for single-phase flow and condensation characteristics inside five micro-fin tubes with the same outer diameter 5 mm and helix angle 18°. Data are for mass fluxes ranging from about 200 to 650 kg/m2 s. The nominal saturation temperature is 320 K, with inlet and outlet qualities of 0.8 and 0.1, respectively. The results suggest that Tube 4 has the highest condensation heat transfer coefficient and also the highest condensation pressure drop penalty, while Tube 5 has the highest enhancement ratio due to its lowest pressure drop penalty and intermediate heat transfer coefficient. Condensation heat transfer coefficient flattens out gradually as G decreases when G < 400 kg/(m2 s) for Tube 2 and... (More)
An experimental investigation was performed for single-phase flow and condensation characteristics inside five micro-fin tubes with the same outer diameter 5 mm and helix angle 18°. Data are for mass fluxes ranging from about 200 to 650 kg/m2 s. The nominal saturation temperature is 320 K, with inlet and outlet qualities of 0.8 and 0.1, respectively. The results suggest that Tube 4 has the highest condensation heat transfer coefficient and also the highest condensation pressure drop penalty, while Tube 5 has the highest enhancement ratio due to its lowest pressure drop penalty and intermediate heat transfer coefficient. Condensation heat transfer coefficient flattens out gradually as G decreases when G < 400 kg/(m2 s) for Tube 2 and Tube 4. This nonlinear mass-flux effect may be explained by the complex interactions between micro-fins and fluid, including liquid drainage by surface tension and interfacial turbulence. In addition, the experimental data was analyzed using seven existing pressure-drop correlations and four heat-transfer models to verify their respective accuracies. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Micro-fin tube, Condensation, Pressure drop, Heat transfer, Mass flux
in
Experimental Thermal and Fluid Science
volume
37
issue
February
pages
19 - 28
publisher
Elsevier
external identifiers
  • scopus:84855201950
ISSN
1879-2286
language
English
LU publication?
no
id
851e891c-d760-4980-b94d-c1ca0169d10b (old id 4285402)
alternative location
http://www.sciencedirect.com/science/article/pii/S0894177711001907
date added to LUP
2014-02-06 15:48:36
date last changed
2017-10-22 03:10:38
@article{851e891c-d760-4980-b94d-c1ca0169d10b,
  abstract     = {An experimental investigation was performed for single-phase flow and condensation characteristics inside five micro-fin tubes with the same outer diameter 5 mm and helix angle 18°. Data are for mass fluxes ranging from about 200 to 650 kg/m2 s. The nominal saturation temperature is 320 K, with inlet and outlet qualities of 0.8 and 0.1, respectively. The results suggest that Tube 4 has the highest condensation heat transfer coefficient and also the highest condensation pressure drop penalty, while Tube 5 has the highest enhancement ratio due to its lowest pressure drop penalty and intermediate heat transfer coefficient. Condensation heat transfer coefficient flattens out gradually as G decreases when G &lt; 400 kg/(m2 s) for Tube 2 and Tube 4. This nonlinear mass-flux effect may be explained by the complex interactions between micro-fins and fluid, including liquid drainage by surface tension and interfacial turbulence. In addition, the experimental data was analyzed using seven existing pressure-drop correlations and four heat-transfer models to verify their respective accuracies.},
  author       = {Li, Guan-Qiu and Wu, Zan and Li, Wei and Wang, Zhi-Ke and Wang, Xu and Li, Hong-Xia and Yao, Shi-Chune},
  issn         = {1879-2286},
  keyword      = {Micro-fin tube,Condensation,Pressure drop,Heat transfer,Mass flux},
  language     = {eng},
  number       = {February},
  pages        = {19--28},
  publisher    = {Elsevier},
  series       = {Experimental Thermal and Fluid Science},
  title        = {Experimental investigation of condensation in micro-fin tubes of different geometries},
  volume       = {37},
  year         = {2012},
}