Simulação numérica de um jato compressível de ar incidente sobre uma placa plana aquecida

Abstract

In this work, the effects of a jet incident on a flat plate were studied heated using the spectral element technique. It is known that jets focusing on heated solid surfaces produce high rates of heat or mass transfer and, therefore, they are widely used in industries involving chemical processes. The use of jets in heating, cooling or drying processes are found in several applications, among which stand out: drying paper and fabric; tempering glass; heating and cooling of metals; cooling of turbine blades and components electronic combustion in catalytic medium. In this study, the flow of the jet is considered two-dimensional, turbulent and compressible. A program was developed computational capable of describing the qualitative behavior of flow structures and collect quantitative information about the heat exchange parameters between the plate heated and the fluid, depending on the heating conditions of the plate and the parameters features that characterize the flow domain. The results presented describe the behavior of the local Nusselt number for uniform distributions of temperatures on the heated plate. In addition, a detailed analysis was carried out on the structures that predominate in the flow. It was found that even for flows with large numbers of Reynolds and Mach, the predominant structures are of great scales, and completely coherent, even for narrow "discharge channels of the flow, where the fluid is quite confined.