EXPERIMENTAL STUDY AND CFD SIMULATION OF HEAT TRANSFER AND FRICTION FACTOR CHARACTERISTICS IN THE CROSSFLOW TUBE BANK

Volume 14, Edição 5, 2022, pp. 21-46

DOI: 10.1615/ComputThermalScien.2022042368

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Shigang Li
School of Physics and Electronic Engineering, Fuyang Normal University, Fuyang 236037, Anhui, China

Xiaoyun Zhao
School of Physics and Electronic Engineering, Fuyang Normal University, Fuyang 236037, Anhui, China

RESUMO

The thermal efficiency of the crossflow tube bank with four different geometries is investigated for a broad range of Reynolds numbers. The computational flow dynamics (CFD) simulation and empirical analyses for heat transfer, exergy loss, and friction factor were performed. Two parameters, including Nu/f and J/f ratios, are calculated and compared to assess the different geometries thoroughly. According to the obtained results, the cam-shaped tube showed the best overall performance, whereas the circular tube had the lowest performance. The possible improvement was because of the lower relative pressure drop and higher relative heat-transfer improvement, which considerably increases the dissipation of the heat. The effect of geometry has a noticeable impact on the outcome of both thermal and hydrodynamic performances of the tube banks, as a smoother transition in geometry helps reduce the pressure drop exerted by the staggered arrangement of the tube. However, the higher turbulence generation rate can lead to a more improved heat-transfer coefficient, but the combined effect of the tube geometry would decide the overall performance. Moreover, an exergy analysis was conducted for the geometries studied in this paper. Since the scarcity of this type of examination in this field, it can help even further understanding of this section of heat-transfer science.

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Palavras-chave: heat exchangers, tube banks, heat-transfer rate, exergy analysis, cam-shaped tube bank

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