A numerical study of the heat transfer due to an array of submerged jets impinging on a moving surface

Abstract

Impingement jet heat transfer is used in numerous industrial processes due to its superior heat transfer characteristics. Cooling of electronic components and turbine blades are two such applications. Paper and textile drying as well as heat-treating of nonferrous metal sheets also employ arrays of jets. In these instances the impingement surface is moving perpendicularly to the jet. The surface motion introduces phenomena critical to the heat transfer characteristics of the process. The jet-to-jet interaction, the geometrical parameters of the jet array, Reynolds number, and surface motion effects are investigated in a numerical study employing the finite difference technique. The SIMPLE algorithm is employed in the solution of the discretized conservation equations. The jets under consideration are submerged (jet fluid is the same as environment fluid), planar and exit the nozzle with a developed (flat) velocity profile. Laminar and turbulent regimes are considered and the impingement surface is isothermal.