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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
; ; ; ; ; and
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
2016-04-01 10:14:30
date last changed
2022-04-20 00:08:58
@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}},
  keywords     = {{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}},
  url          = {{http://www.sciencedirect.com/science/article/pii/S0894177711001907}},
  volume       = {{37}},
  year         = {{2012}},
}