Heat and Flow Characteristics of Jet Impingement: Literature Review

NAVEEN C S; V.V Katti

doi:10.37591/rtfm.v7i1.3860

Abstract

AbstractA comprehensive review on jet impingement heat transfer and flow characteristics of impinging synthetic jets were compared with continuous jets. Considering all the single phase heat transfer jet impingement has maximum heat transfer rate. A number of experimental arrangements as done to study the jet impingement such as jet impingement on a solid flat surface, rough surface, concave surface, convex surface, etc. A large number of papers dealing with experimental and computational studies on different physical and computational aspects of jet impinging flows are reviewed. Different geometrical parameters were found to influence the characteristics, such as flow confinement, nozzle shape, jet to plate spacing and Reynolds number. An extremely small number of studies dealing with application based jet impingement heat transfer configurations experimentally and numerically have been reported in the literature. Various turbulence models such as elliptic relaxation turbulence model (v2-f model), k-ε turbulence model (RNG), etc. such models have complexities and boundary conditions are reviewed for jet impingement heat transfer. It was observed that majority of authors used k-ε turbulence model (RNG) turbulence model due to its less complexity. However, turbulence modellers encounter numerous difficulties due either to the fact that the details of most of these experimental data sets are not known, or to the fact that the geometry and boundary conditions are not obtained. Some literature show that synthetic jet exhibits stronger local heat transfer than the continuous jet same Reynolds number at stagnation point. Synthetic jet spread more in radial direction and more mass flow rate as compared to air jet at same Reynolds number.Keywords: Jet impingement, turbulence, Nusselt number, convective heat transfer