INTERACTION OF A DROPLET CLOUD WITH THE FREE CONVECTION FLOW FIELD OVER A HEATED PLATE

The interaction of a droplet cloud with a stratified turbulent environment, associated with a free convective flow field created above an isothermally heated horizontal surface is investigated experimentally. The droplet cloud created with a nebulizer, is injected normal to the plate and at significant distance from it, initially forming a two-phase jet. Droplet characteristics’ measurements are based on Phase Doppler Anemometry (PDA), providing information on droplet size, as well as mean velocity, rms values, skewness and flatness factors of the droplet turbulence velocity field under isothermal and stratified conditions, for two nebulizer flow rates. The single and two phase stratified thermal fields are also investigated. Temperature measurements are obtained with a fine thermocouple. Mean temperature along with rms values, skewness and flatness factors distributions, monitoring the stratified thermal field properties free of or, under the influence of the spray cloud, are presented and discussed.