Effect of Curvature on Heat Transfer Characteristics for Jet Impingement Cooling of a Moving Surface

Abstract

This paper presents a three-dimensional numerical study of water jet impingement cooling on a hot moving/rotating surface. The main objective of this paper is to analyze the effect of surface curvature (convex surface) on heat transfer characteristics. The conjugate heat transfer phenomenon occurring between surfaces with varying curvatures is investigated. The flow parameters, boundary conditions, and computation domain are chosen the same for all the geometries, to have a detailed insight. Two different sets of conditions are considered in this study. In the first set, the effect of curvature on heat transfer is analyzed considering a stationary flat plate (130 mm × 65 mm) and a stationary cylinder (ϕ 41.4 mm). Further we compared the effect of surface curvature between two cylinders of a different radius of curvature (ϕ 41.4 mm & ϕ 20.7 mm). The Reynolds number, Red as defined based on the diameter of the circular nozzle is taken to be 56,000. The surface of the flat plate and the circular cylinder is maintained at a constant temperature condition. The simulation results obtained from this study establish a notable impact of surface curvature and motivates the use of such a non-conventional set-up in a lab-scale facility.