Abstract: This paper investigates behaviour of air ent rained by rollers at the point ofnon-aerated plunging jet entry. Experimental results indicate that air retained from thepoint of jet entry diffuses along shear layer.Air concentration at the point of entry increocseswith water depth decreasing.There is a form of error function for velocity distribution ofair-water mixture in shear laver. Air concentration is correspondent to normal distribution,in internal and external shear layers respectively. The agreement b...