Heat Transfer Correlations for Star-Shaped Fins

Star-shaped fins are a newer type of fin for which correlations for heat transfer and pressure drop do not yet exist in the literature. Therefore, correlation equations for air-side heat transfer and pressure drop in a finned heat exchanger with star-shaped stainless-steel fins in staggered arrangem...

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Bibliographic Details
Published in:Applied sciences 2021-07, Vol.11 (13), p.5912
Main Authors: Bošnjaković, Mladen, Čikić, Ante, Muhič, Simon, Holik, Mario
Format: Article
Language:English
Subjects:
Aerodynamics
Computational fluid dynamics
Computer applications
correlation
Correlation coefficient
Correlation coefficients
Deviation
Experiments
Fins
Fluid dynamics
Heat exchangers
Heat transfer
Hydrodynamics
Laboratories
Laboratory tests
Numerical analysis
Pressure drop
Reynolds number
star-shaped fins
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Summary:Star-shaped fins are a newer type of fin for which correlations for heat transfer and pressure drop do not yet exist in the literature. Therefore, correlation equations for air-side heat transfer and pressure drop in a finned heat exchanger with star-shaped stainless-steel fins in staggered arrangement were developed in this work. To obtain these correlations, a numerical analysis of the basic heat exchanger geometry and another 21 variants of heat exchanger geometry was performed using computational fluid dynamics, and then the results of laboratory tests of a model of heat exchangers with star-shaped fins were used. In the numerical analysis, the fin pitch, the fin thickness, and the air velocity at the inlet to the heat exchanger were varied. The Nusselt (Nu) and Euler (Eu) numbers were determined for each variation analyzed. Initial correlations for Nu and Eu were derived using the least-squares deviation method. The correlation coefficients thus obtained were adjusted to agree with the results of the laboratory tests. The deviation of the final obtained correlation for Nu from the experimental test results was up to 10% in the range of Re < 3500, whereas for higher values of Re, the deviation was less than 2%. The Eu correlation deviated from experimental results up to 19% in the range of Re < 4000, whereas in the range of Re > 5600, the deviation was less than 1%. The correlations were valid in the range 2000 < Re < 16,000.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11135912