Features of Initial Operation Phase for Film Nozzle with Gasifying of the Liquid Film

A mathematical model process of the forming and gasifying of the liquid film has been developed. The numerical simulation process of the disintegration of the liquid jet both directly on the rigid wall impact in a slot channel and at the subsequent exposure of air stream upon the forming liquid film is carried out. Performed experimental researches of this process have shown the accuracy of the developed mathematical model. In contrast to the known ones, the developed mathematical model allows to calculate the gas-liquid medium humidity and droplet distribution immediately within the nozzle cavity. Analysis of the results showed that during the establishment process of liquid flow within the film nozzles there is a collision of a liquid jet with the wall of the slotted channel. Then there is liquid flow ’s turn to the wall of the slotted channel contiguous to the slit nozzle, which leads to the destruction of the liquid jet and to the mechanism implementation of the high-frequency disintegration for the liquid jet in the initial stage. Calculation revealed that the dropping mechanism varies significantly at the gasifying of the liquid film. In this case the radial interference of liquid and gas jets occurs, which leads to the pressure space forming in this zone and, as a result, to incipient cavitation which significantly reinforce crushing mechanism of fluid.

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