Abstract
The aim of this design was to improve the heat transfer performance significantly due to larger turbulent region and much vortices formed by tube inserted. In this article, the BSL k-ω model was chosen as turbulence model to simulate the thermohydraulic performance of the proposed tubes inserted with rectangular winglet vortex generators (RWVGs) when the Re was set as 5000 to 15,000. The reliability of the simulation results was obtained by comparing with the empirical formulas and experimental results. By means of numerical simulation, the influence mechanism of geometric parameters of RWVGs on thermal-hydraulic performance in tubes was analyzed. And the impact of three configurational parameters on the thermal performance was studied, namely the angle α, the height H and the number N of the RWVGs, respectively. The results revealed that the capacity of heat transfer in tubes with RWVG inserts was obviously larger than that in ordinary circular tube. In addition, it could be seen from the results that both Nu and f increased with the increase of H and N. At the same time, the case of α = 135° showed the greatest enhancement of thermal performance than the case of α = 45° and α = 90°.The PEC achieved the highest value of 1.23 when the height H of RWVG was 0.7 mm, the number N was 20, and angle α was 135°.
Highlights
Due to the good thermal conductivity and isothermal properties, heat exchange tubes, as one of the most common core heat exchange components, were usually applied in abundant industrial fields, such as heat recovery system, food production industry, energy utilization and so on
The results revealed that the thermal performance of tubes with rectangular winglet vortex generators (RWVGs) inserts was obviously better than that of ordinary tube and thermal enhancement could be increased by about 40%
In order to optimize the synergistic effect between the thermal performance and the energy loss to obtain low resistance and efficient heat transfer performance, the present work came up with a novel tube inserted with rectangular winglet vortex generators (RWVGs)
Summary
Due to the good thermal conductivity and isothermal properties, heat exchange tubes, as one of the most common core heat exchange components, were usually applied in abundant industrial fields, such as heat recovery system, food production industry, energy utilization and so on. Due to the enhancement of fluid mixing by vortex, the results showed that the PEC were found to vary from 1.3 to 2.3 Later, they [31] numerically investigated the thermal performance of the novel internally grooved tube with multi-vortexes. They [31] numerically investigated the thermal performance of the novel internally grooved tube with multi-vortexes It concluded that groove inclination angles had great effect on heat transfer performances and the minimum entropy generation number and maximum overall thermal-hydraulic performance were reached when the groove inclination angle was 30◦. In order to optimize the synergistic effect between the thermal performance and the energy loss to obtain low resistance and efficient heat transfer performance, the present work came up with a novel tube inserted with rectangular winglet vortex generators (RWVGs). All the work was conducted when the Reynolds number was between 5000 and 15,000
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