527 / 2019-01-08 23:48:35

Heat transfer augmentation in a heat exchanger tube with V-orifice turbulator bundles

Heat transfer, turbulent flow, turbulence generator, V-orifice turbulator

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Applying turbulence generator (TG) or turbulator is one of the effective heat transfer enhancement technologies to increase the heat transfer and thermal performance of heat exchangers. Nowadays, many new concept designs of the turbulators have been developed to improve a good practice use for compact heat exchanger devices. In this article, V-orifice turbulator bundles prototype for tube heat transfer augmentation is carried out. The V-orifice turbulator bundles are placed in the core of a heat exchanger tub. Present investigation reports the influence of V-orifice turbulator bundles on heat transfer rate, friction factor and thermal performance factor behaviors. Tests are performed by insertion the V-orifice turbulator with various operating parameters such as pitch ratios (PR = 1.0, 1.5 and 2.0) and Reynolds Number (5000-18,000). Air was used the working fluid that flow in a test section under uniform wall heat flux conditions, The structure of the longitudinal vortex flow inside the test section induced by the V-orifice turbulator bundles was also displayed. It was observed that pairs of longitudinal vortex flow were generated behind each V-orifice turbulator, that lead to the heat transfer augmentation. To further assess the thermal performance of V-orifice turbulator, the heat absorption rate of V-orifice turbulator is compared with that of plain tube under the criterion of identical pumping power consumption, the former is 130-169% higher than the latter. The thermal performance factor is found to be greater than unity for each configuration studied with V-orifice turbulator bundles. Correlations of the V-orifice turbulator bundles have been developed Nusselt number (Nu), friction factor (f) and thermal performance factor for Reynolds number varying between 5000-15,000.