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In the current work, the flow visualizations, heat transfer characteristics and thermal performance assessments in the circular tube heat exchanger with the delta winglet turbulators are investigated numerically. The eight delta winglets are placed on the plate and inserted in the middle of the circular tube on both V–tip pointing downstream called “V–Downstream and V–tip pointing upstream called “V–Upstream”. The influences of the flow blockage ratios; b/H, BR = 0.05 – 0.20 and flow attack angles;  = 20, 30, 45 and 60, are studied for the Reynolds numbers; Re = 100 – 2000 with the single pitch spacing ratio of 1; p/H, PR = 1. The numerical results are compared with the smooth circular tube without turbulators and reported in terms of the flow structure, heat transfer profile, Nusselt number ratio (Nu/Nu0), friction factor ratio (f/f0) and thermal enhancement factor (TEF). As the numerical results, it is found that the use of the delta winglet turbulators helps to augment the heat transfer rate and thermal performance by creating the vortex flows, small vortices and impinging flow on the tube wall.The presence of the delta winglet turbulators leads to enhance on heat transfer and pressure loss higher than the smooth tube for all cases. In addition, the optimum thermal enhancement factor is found to be around 2.85 at Re = 2000,  = 30 and V–Downstream.

revista técnica de la facultad de ingeniería. universidad del zulia/revista técnica de la facultad de ingeniería

Flow visualization, heat transfer behavior and thermal performance improvement in a circular tube heat exchanger with modified delta winglet turbulators