Experimental investigations of the conditions of the onset of air entrainment by plunging liquid jets

Abstract

1. On the basis of experimental studies dependences (4) and (6) were obtained, which make it possible to determine the air-entrainment velocity by laminar and turbulent jets. Dependences (4) and (6) are confirmed by investigations of other authors. 2. The conditions of the onset of air entrainment by laminar jets were investigated in the entire range of variation of Re numbers for the laminar flow region. 3. It was established that the conditions of the onset of air entrainment are determined by the state of the jet. The air-entrainment process is observed with a sufficient degree of development of jet disturbances and constant value of its kinetic energy, which is spent on the formation of cavities and an increase of air bubbles inside the stationary liquid.