THREE-DIMENSIONAL NUMERICAL STUDY OF FLUID AND HEAT TRANSFER CHARACTERISTICS OF DIMPLED FIN SURFACES

被引:30
|
作者
Fan, J. F. [1 ]
Ding, W. K. [1 ]
He, Y. L. [1 ]
Tao, W. Q. [1 ]
机构
[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Key Lab Thermofluid Sci & Engn, MOE, Xian 710049, Shaanxi, Peoples R China
关键词
FIELD SYNERGY PRINCIPLE; PRESSURE-DROP CHARACTERISTICS; FLOW STRUCTURE; PERIODIC DISTURBANCES; SINGLE; CHANNEL; IMPLEMENTATION; ARRANGEMENT; PERFORMANCE; EXCHANGERS;
D O I
10.1080/10407782.2012.666931
中图分类号
O414.1 [热力学];
学科分类号
摘要
In the present study, a code based on the nonorthogonal curvilinear coordinates is developed with a collocated grid system generated by the two-boundary method. After validation of the code, it is used to compare simulated results for a fin-and-tube surface with coupled and decoupled solution methods. The results of the coupled method are more agreeable with the test data. Simulation for dimpled and reference plain plate fin-and-tube surfaces are then conducted by the coupled method within a range of inlet velocity from 1.0m/s to 5m/s. Results show that at identical pumping power the dimpled fin can enhance heat transfer by 13.8-30.3%. The results show that relative to the reference plain plate fin-and-tube surface, heat transfer rates and pressure drops of the dimpled fin increase by 13.8%-30.3% and 31.6%-56.5% for identical flow rate constraint. For identical pumping power constraint and identical pressure drop constraint, the heat transfer rates increase by 11.0%-25.3% and 9.2%-22.0%, respectively. By analyzing the predicted flow and temperature fields it is found that the dimples in the fin surface can improve the synergy between velocity and fluid temperature gradient.
引用
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页码:271 / 294
页数:24
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