Numerical Investigation of Thermal-Hydraulic Performance of Circular and Non-Circular Tubes in Cross-Flow

Authors: Deeb R., Sidenkov D.V., Salokhin V.I. Published: 14.05.2021
Published in issue: #2(95)/2021  
DOI: 10.18698/1812-3368-2021-2-102-117

Category: Physics | Chapter: Thermal Physics and Theoretical Heat Engineering  
Keywords: circular tube, cam-shaped, drop-shaped, heat transfer, drop pressure, friction factor, thermal-hydraulic performance, numerical investigation

A numerical study has been conducted to clarify flow and heat transfer characteristics around circular, cam, and drop-shaped tubes using the software package ANSYS FLUENT. Reynolds number Re based on equivalent circular tube is varied in range of (8.1--19.2)·103. All tube shapes are investigated under similar operating conditions. Local heat transfer, pressure and friction coefficients over a surface of the tubes were presented. Obtained results agree well with those available in the literature. Correlations of the average Nusselt number Nuav and a friction factor f in terms of Reynolds number for the studied tubes were proposed. The results indicated that Nuav increases with increasing Re. In the contrary, f decreases as Re increases. Thermal-hydraulic performance is used to estimate the efficiency of the cam and drop-shaped tubes. Results show that the drop-shaped tube has the best thermal-hydraulic performance, which is about 1.6 and 2.5 times higher than that of the cam-shaped and circular tube, respectively


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