Experimental study of liquid film thickness formed by spray impingement on a solid surface

Spray impingement on a solid surface has been studied. A flow blurring injector is used to atomized the liquid. In this type of injector, a back flow of air penetrates into the liquid orifice at the orifice exit just before the injection surface. The remained air flow rate also squeezes the two phase flow at the orifice exit. Here, the film thickness formed by the impingement of the spray with a thin wall is measured using imaging techniques. The results showed that in the high volumetric liquid flow rate there is a liquid film on solid surface which can lead to incomplete combustion. There are many parameters which can affect the liquid film on the surface like: liquid and gas flow rate and distance from nozzle to surface. In this study it is intended to measure and analyze the liquid film which is formed by the spray of the novel injector named flow blurring injector and investigate the effect of aforementioned parameters.