Turbulent heat transfer for impinging jet flowing inside a cylindrical hot cavity

Abstract

Convective heat transfer from an isothermal hot cylindrical cavity due to a turbulent round jet impingement is investigated numerically. Three-dimensional turbulent flow is considered in this work. The Reynolds stress second order turbulence model with wall standard treatment is used for the turbulence predictions the problem parameters are the jet exit Reynolds number, ranging from 2x104 to 105and the normalized impinging distance to the cavity bottom and the jet exit Lf, ranging from 4 to 35. The computed flow patterns and isotherms for various combinations of these parameters are analyzed in order to understand the effect of the cavity confinement on the heat transfer phenomena. The flow in the cavity is divided into three parts, the area of free jet, and the area of the jet interaction with the reverse flow and the semi-quiescent flow in the region of the cavity bottom. The distribution of the local and mean Nusselt numbers along the cavity walls for above combinations of the flow parameters are detailed. Results are compared against to corresponding cases for impinging jet on a plate for the case of the bottom wall. The analysis reveals that the average Nusselt number increases considerably with the jet exit Reynolds number. Finally, it was found that the average Nusselt number at the stagnation point could be correlated by a relationship in the form Nu=f(Lf,Re).

Features of heat transfer at interaction of an impact swirl jet with a dimple

“…The detailed structure of the flow and heat transfer during the interaction of an impinging jet with a single hole was studied in experimental works [6][7][8][9][10]. In [11][12][13][14][15][16], the problem of jet penetration into the cylindrical cavities, extended along the length, is considered. Widespread practical application of the impinging jets caused numerous studies of complex interactions of the single jets and their systems with the surfaces of various shapes [17,18].…”

Self-similarity of heat transfer characteristics in laminar submerged and free-surface slot jet impingement

“…Therefore, impinging circular and planar jets are used in numerous variations and applications, that require high rates of heat and mass transfer [5]. Divided into heating and cooling purposes common examples of utilization are the textile and paper manufacturing [6], gravure printing industry [7], the plywood industry [8], de-icing of aircraft wings [9], gas turbine cooling purposes and cooling of electronic components, since jet impingement provides the required combination of high convective heat transfer with component compactness [10,11].…”

Numerical investigation of turbulent flow and heat transfer over partially open cavities: Effect of opening ratio

“…The problem of shear/lid driven cavity flow has an important relevance to numerous engineering applications such as heat exchangers [1,2], flight aerodynamics [3,4] and combustion and turbomachinery [5,6]. In addition, the problem has a long history as a fundamental fluid mechanics benchmark case for the development of numerical codes for the solution of Navier-Stokes equation [7].…”