Convective Heat and Mass Transfer in the Stagnation Region of a Laminar Planar Jet Impinging on a Moving Surface

Abstract

Manufacturing processes frequently employ impinging jets to cool or dry a material. Materials are often in motion since many manufacturing processes are designed to produce large quantities of a product. In some cases, the surface velocity can exceed or be comparable to the jet impingement velocity. In this study, the stagnation region of a laminar, planar jet is considered where surface motion is directed perpendicular to the jet plane. A similarity solution to the Navier-Stokes equations is formulated to determine the flow velocity in the stagnation region. Heat and mass transfer distributions are determined from numerical solutions to the conservation equations for energy and species, where velocity components are calculated from the similarity solution. Restrictions regarding the use of heat and mass transfer correlations, which are commonly developed with experimental apparatuses where the impingement surface is stationary, are provided.