Heat transfer in a confined impinging jet with swirling velocity component

Abstract

Abstract. Heat transfer measurements based on an infrared experimental method (TOIRT) are compared with CFD simulations of a confined impinging jet with tangential velocity component. The tangential velocity component added to a pure impinging jet introduces into the flow field and heat transfer some similarities with real industrial processes like agitated vessels with axial-flow impellers. The tangential velocity component significantly influences the velocity field and heat transfer intensity in the stagnant region when compared to the classic impinging jet characteristics. Several turbulence models were used in numerical simulations of an agitated vessel with axial-flow impeller in a draft tube. Heat transfer coefficients at the vessel bottom were evaluated using the TOIRT method and compared with numerical results. The lateral heat conduction in the impinged wall was analysed with the conclusion that it has relatively small impact on the measured heat transfer coefficients. Quite good agreement of experimental data and simulation results was achieved concerning the size and position of the heat transfer maximum at the vessel bottom.

Investigation on Circular Array of Turbulent Impinging Round Jets at Confined Case: A CFD Study

“…Memar, et al [13] studied convective heat transfer data from a confining tube to coaxial, counter-swirled jets and observed that peak Nusselt number was shifted upstream with the increase of inner jet swirl strength. Petera, et al [14] studied both experimentally and numerically heat transfer measurements of a confined impinging jet with a tangential velocity component. They found that the addition of the tangential velocity component significantly influences the velocity field and the intensity of heat transfer in the stagnant region compared to the classical characteristics of the impinging jet.…”