A hybrid V-shaped and spherical dimple structure in a rectangular channel for enhancing the thermal-hydraulic performance

It is critical to increase the cooling channel's thermal-hydraulic performance for the sake of hot component safety and lowering power consumption during fluid transport. In this work, a hybrid V-shaped and spherical dimple structure is designed and numerically analysed to evaluate the heat transfer and fluid flow features in the rectangular cooling channel when the Reynolds number is 8500-50,000. The thermal-hydraulic performances of the cooling channel are compared with the spherical dimple only, the V-shaped dimple only, and the hybrid V-shaped and spherical dimple structure, and the effect of the spacing between the V-shaped dimple and spherical dimple in the hybrid V-shaped and spherical dimple structure on the fluid flow and heat transfer is also investigated. The findings show that the presence of longitudinal vortexes originating from the V-shaped dimple effectively eliminates the recirculation zone in the spherical dimple of the hybrid V-shaped and spherical dimple structure. Consequently, this leads to an improvement in heat transfer within the channel featuring the hybrid V-shaped and spherical dimple structure. Compared with spherical dimple only and V-shaped dimple only, the performance evaluation index of the hybrid V-shaped and spherical dimple structure under equal pumping power increases by up to 11.9% and 13.3%, respectively.