An experimental investigation was performed for convective condensation of R410A inside four micro-fin tubes with the same outside diameter (OD) 5 mm and helix angle 18°. Data are for mass fluxes ranging from about 180 to 650 kg/m2s. 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 best thermal performance for its largest condensation heat transfer coefficient and relatively low pressure drop penalty. Condensation heat transfer coefficient decreases at first and then increases or flattens out gradually as G decreases. This complex mass-flux effect may be explained by the complex interactions between micro-fins and fluid. The heat transfer enhancement mechanism is mainly due to the surface area increase over the plain tube at large mass fluxes, while liquid drainage and interfacial turbulence play important roles in heat transfer enhancement at low mass fluxes. In addition, the experimental data was analyzed using seven existing pressure-drop and four heat-transfer models to verify their respective accuracies.
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ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels
July 8–12, 2012
Rio Grande, Puerto Rico, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4478-6
PROCEEDINGS PAPER
Condensation Pressure Drop and Heat Transfer in 5-mm-OD Micro-Fin Tubes Available to Purchase
Wei Li,
Wei Li
Zhejiang University, Hangzhou, Zhejiang, China
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Dan Huang,
Dan Huang
Zhejiang University, Hangzhou, Zhejiang, China
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Zan Wu,
Zan Wu
Zhejiang University, Hangzhou, Zhejiang, China
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Hong-Xia Li,
Hong-Xia Li
Zhejiang University, Hangzhou, Zhejiang, China
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Zhao-Yan Zhang,
Zhao-Yan Zhang
University of Nebraska, Lincoln, NE
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Rong-Hua Hong,
Rong-Hua Hong
Zhejiang University, Hangzhou, Zhejiang, China
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Si-Pu Guo,
Si-Pu Guo
Zhejiang University, Hangzhou, Zhejiang, China
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Jing Li
Jing Li
Zhejiang University, Hangzhou, Zhejiang, China
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Wei Li
Zhejiang University, Hangzhou, Zhejiang, China
Dan Huang
Zhejiang University, Hangzhou, Zhejiang, China
Zan Wu
Zhejiang University, Hangzhou, Zhejiang, China
Hong-Xia Li
Zhejiang University, Hangzhou, Zhejiang, China
Zhao-Yan Zhang
University of Nebraska, Lincoln, NE
Rong-Hua Hong
Zhejiang University, Hangzhou, Zhejiang, China
Si-Pu Guo
Zhejiang University, Hangzhou, Zhejiang, China
Jing Li
Zhejiang University, Hangzhou, Zhejiang, China
Paper No:
HT2012-58051, pp. 41-50; 10 pages
Published Online:
July 24, 2013
Citation
Li, W, Huang, D, Wu, Z, Li, H, Zhang, Z, Hong, R, Guo, S, & Li, J. "Condensation Pressure Drop and Heat Transfer in 5-mm-OD Micro-Fin Tubes." Proceedings of the ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 41-50. ASME. https://doi.org/10.1115/HT2012-58051
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