Influence of Inlet Pressure and Air Velocity on Film Forming Characteristics of Nozzles
In order to study the influence of the cooling water inlet pressure and the air velocity on the nozzle film forming characteristics,taking the jet condenser nozzle as research object,the visualization experiment method was used to capture images of the liquid film flow pattern at the condenser nozzle out-let.Through digital image processing,the liquid film area and jet length were obtained,which was com-pared with the calculation results of various turbulence models in numerical simulations,and the Realiza-ble k-ε turbulence model was selected.The Fluent solver was used to combine the Realizable k-ε tur-bulence model with the VOF approach for numerical analysis of the flow field in the condenser.Results show that as the nozzle inlet pressure rises from 3 kPa to 25 kPa,the velocity near the wall of the liquid distribution plate increases steadily with the increase of the inlet pressure,while the liquid film thickness tends to decrease progressively.For DN15 and DN13 nozzles,the liquid film area reduces marginally when the air moves from a stationary condition to an air velocity of 30 m/s,and the liquid film area de-creases fast when the air velocity increases from 30 m/s to 150 m/s.
jet condensernozzleheat transferinlet pressureair velocityspreading area
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