Atomization of Liquid by Means of a Rotating Nozzle : Effects of Physical Properties of Liquid on Droplet Sizes

Abstract

Effects of liquid viscosity and surface tension on a mean droplet diameter were investigated by using glycerine-water and ethyl alcohol-water solutions. And it is found that when the rotating speed is low, an increase in viscosity causes a decrease in the mean diameter ; but in the state of spray dispersion the effect of viscosity becomes negligibly small. It is also found that the decreased surface tension reduces the diameter regardless of a disintegration mode of jet. The size distribution of droplets was also examined. Two peaks are formed in a frequency curve when the rotating speed is relatively low, but with the increase of the speed they approach nearer and finally, i.e. in the region of spray, come to embrace each other. Empirical formulas for the S.M.D. and for a frequency curve are derived in the region of spray.