Gas entrainment behavior of vertical plunging liquid jets in terms of changes in jet surface length

Abstract

JapanFor a vertical jet system using various liquids, the shape change of liquid jets discharged from nozzles having different nozzle aspect ratios was evaluated in terms of the surface length f, of the jet flow, and the relation between the change of fm and the gas entrainment behavior was investigated. It was found that the way of changing of P,,, with varying operating conditions or the liquids corresponded well to that of changing of the gas entrainment rate Q,, that is. the change off, of the jet before plunging could be closely related to the change of Q,?.Pour un s y s t h e de jets verticaux utilisant diffirents liquides, nous avons CvaluC en fonction de la longueur de surface P,, de I'Ccoulement du jet, le changement de forme des jets liquides provenant l'orifices ayant diffkrents Clancements. et nous avons CtudiC la relation entre le changement de f, et le comportement d'entrainement du gaz. Nous avons trouve que la matikre dont f,, varie suivant diffkrentes conditions opiratoires ou diffirents liquides correspond bien B la maniere dont la vitesse d'entrainement du gaz Q8 change, B savoir que le changement de f,,) du jet avant la plonge pourrait &tre plus Ctroitement relite au changement de Q,.