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Chemcial Industry and Engineering 2017, Vol. 34 Issue (1) :65-70    DOI: 10.13353/j.issn.1004.9533.20151006
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Simulation of Plain Fin and Structural Improvement
Xu Sai, Zhu Huiming, Yu Ru
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

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Abstract 

Numerical model for predicting performance of plain fin was established, which incorporated characteristics of fluid flow and heat transfer. In order to precisely calculate factors f and j in turbulent region, low-Re turbulence model was adopted and the default turbulent Prandtl number value of 0.85 was replaced by turbulent Prandtl model with UDF (user-defined function) method. Numerical results of factors j and f were compared with experimental work. The average absolute relative deviations of factors j and f between numerical and experimental results are 6.72% and 6.47% respectively. The temperature at center of fin was lowest and was called Tc for convenience. The temperature difference between Tc and Tin (temperature of fluid before entering fin passage) was about 5%-18% lower than the temperature difference between up (down) plate and Tin. In order to increase overall performance of plain fin, intersections of fin and up (down) plate were periodically cut away, and the factor j was 2.76%-12.44% higher than the original one.

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Xu Sai
Zhu Huiming
Yu Ru
Keywordsplain fin;   low-Re turbulence model;   turbulent Prandtl number;   turbulent region;   CFD     
Received 2015-01-04;
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Xu Sai, Zhu Huiming, Yu Ru.Simulation of Plain Fin and Structural Improvement[J]  Chemcial Industry and Engineering, 2017,V34(1): 65-70
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