The present paper aims to further enhance understanding the details of heat transfer and flow regimes in flows around single cylinders and multi-tube banks with heat transfer, and is typically applied in heat exchangers in air conditioning and power industries. Throughout the past few decades, computational techniques had greatly been improved and advanced to handle three dimensional flows in complex geometries .Computational Fluid Dynamics (CFD) tools are conveniently utilized for both design improvements and performance analyses aiming at reduced energy consumptions and greener environment. Predictions of local flow and heat transfer characteristics in such complex geometries are made through the numerical solution of governing equations of mass, momentum, energy and species transports in different flow domains that simulate industrial applications. The present work demonstrated the capabilities of CFD software to adequately predict flow regimes and heat transfer characteristics in different heat exchangers arrangement using more than 800000 control volumes; these were of the structured tetrahedral configurations. The validity of such simulation procedures is assessed by comparisons with previously published experimental data and simulation results. Various comparison test cases applied to heat exchangers multiple tube bundles were performed and the obtained numerical results are compared to experiments. Good qualitative agreements were generally observed with some discrepancies in the vicinity of separation zones.
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