In order to improve the temperature uniformity and reduce the maximum temperature of the surface with Gaussian heat flux, a radiator with jet impinging on the structured surface was proposed in this paper. The effects of Reynolds number and structured surface geometry were observed. The heat transfer performance for three structured surfaces were compared with smooth wall configuration under the same conditions. As the Reynolds number increases, Nu appears with multiple local peaks in the radial direction, which is attributed to the increase of turbulent kinetic energy and the change of flow field. Among three structured surfaces, the rectangular rib has the best performance both in heat transfer and temperature uniformity, followed by the cubic rib, both of which have strong disturbance to the flow field. Due to larger thermal resistance of heat conduction, the convex structure exhibits worst heat transfer performance.
Keywords jet impingement heat transfer, Gaussian heat flux, structured surface