Experimental investigation of condensation in micro-fin tubes of different geometries
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4285402
- author
- Li, Guan-Qiu ; Wu, Zan LU ; Li, Wei ; Wang, Zhi-Ke ; Wang, Xu ; Li, Hong-Xia and Yao, Shi-Chune
- organization
- publishing date
- 2012
- 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 < 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}}, }