Heat transfer enhancement in multijet micropin fin heat sink

The thermal performance of tiny heat sinks with liquid cooling is being studied in order to solve the issue of electronics cooling. Increasing thermal performance while lowering pressure drop and maintaining a constant substrate temperature is a difficult task. The purpose of this study is to harvest the useful features of combination of microjet and micropin fins and explore the influence of geometrical features on fluid structures and heat transfer. To comprehend and assess the performance of a multijet heat sink with a micropin fin, three-dimensional numerical simulation is used in this inquiry. The three parameters under consideration are, the ratio of the jet diameter to the pin fin diameter (alpha), which ranges from 1.5 to 6.0; the ratio of the jet diameter to the jet standoff distance (beta), which ranges from 0.75 to 1.5; and the pin fin pitch is determined by the ratio of the pin fin diameter to the pitch length (lambda), which ranges from 0.1 to 0.8. The grid independence test is done to ensure accuracy in numerical results. The numerical scheme is validated by comparing numerical results with that of experimental results from literature. The results obtained from numerical simulation are analyzed. It has been found that improving heat transfer is not just caused by expanding the contact surface area; fluid structure vortex generation also affects overall thermal performance. Better overall performance is produced at lower values of alpha, beta and higher values of lambda. The ideal design parameters are alpha = 1.99, beta = 1.431, and lambda = 0.699, according to the optimization of geometrical parameters using a radial basis neural network surrogate model and particle swarm optimization. The jet Reynolds number is found to have no significant impact on the overall performance. A 3D-conjugate heat transfer model is used to obtain the fluid structure and its influence on heat transfer and pressure drop in heat sink with multijet microjet and cylindrical shape micropin fin which has not been investigated to the best of the author's knowledge. Though a lot of studies circulate around complicated heat sink shape, this simple multijet and pin fin combination seems to be ignored in earlier studies.