Even though heat transfer as one of three energy transfer processes has been comprehensively studied since its inception, it sentire understanding is challenging due to the very complex characteristics Heat transfer is classified into the three modes of heat conduction, convection, and radiation in addition to equilibrium.The heat diffusion theory for conductive heat transfer is well established, but a rigorous theory for thermal internal convective heat transfer does not exist. As a consequence, reliable theoretical methods are still lacking, and the extrapolation beyond experiments plays the major role at the present state of the art.However, design, operation, and optimization of involved devices require accurate predictions of heat transfer between a solid surface and a fluid