Hydrodynamics of Twin Water Jets Impingement on a Flat Horizontal Moving Surface

Abstract

The interaction of twin round free-surface water jets impinging vertically on a horizontal moving surface is numerically studied. Jets flow rate (15, 22, 30 L/min) and substrate velocity (0.6, 1.0, 1.5 m/s) were systematically changed relevant to steel cooling process. Realizable k-ε turbulent model and volume-of-fluid method were used to obtain the impingement flow characteristics that occur over moving surface during the simulations such as wetting front and wall jets interaction. Different types of twin jets interaction were captured depends to plate-to-jet velocity ratio. As the jets flow rate increase and/or the surface speed decreases, the wall jets arrive earlier to the interaction zone with higher momentum and up-wash fountain created. But, a thick calm dome-shape interaction type was occurred in case of low flow rate and slow plate speed where the wall jets collide together with low momentum. Different flow velocity distributions are found respect to the jets interaction type. The numerical results were agreed with the experiments.