Non-stationary flow and heat transfer in a synthetic confined jet impingement

Abstract

Heat transfer in a synthetic impinging jet in the range of pulse frequencies is studied experimentally and numerically. A heat flux sensor is used to measure averaged and pulsating heat transfer at the point of flow stagnation. Mean and fluctuational structure and heat transfer in a synthetic impinging air jet are simulated using the axisymmetric non-steady-state Reynolds averaged Navier-Stokes equations and the Reynolds stress model. The measured results on the instantaneous and pulsation values of the heat flux at the stagnation point and along the radius of the target surface are obtained. The experimental spectra of heat flux fluctuations on the plate are given. The measurements and numerical predictions of the heat transfer are carried out with variation in the nozzle-to-target distance, and frequency of pulsations of the synthetic jets.