INTERFACIAL INTERACTION OF HIGH-VELOCITY COCURRENT GAS FLOW WITH NEAR-WALL LIQUID FILM INSIDE A NOZZLE AND UNDER OUTFLOW INTO A VACUUM

Abstract

Outflow of a near-wall film of ethanol, butanol, water, and a water-ethanol mixture with a cocurrent gas flow from sonic and supersonic nozzles into vacuum and submerged space is studied experimentally. With the use of capacitive-type probes embedded flush with the inner surface of the nozzle, measurements of the liquid film thickness, the velocities of the leading edge, and waves on the gas-liquid interface are carried out. The process of detachment and entrainment of liquid droplets from the interfacial surface by a cocurrent gas flow is studied. Flow structure of the droplet phase in the gas-droplet flow formed behind the nozzle exit cross section is investigated. The function of the angular distribution of droplets behind the sonic and supersonic nozzles is measured using the technique of droplet deposition on paper substrates. Measurements of the temperature of the liquid film on the external surface of the nozzle are carried out. The effect of the backflow of liquid film along the external surface of the nozzle against gravity is considered.