An Investigation on Turbulent Diffusion by Various Jets

Abstract

A method of concentration and velocity measurements in the mixing flow fields of two different gases is already developed. This method applied hot-wire techniques can be given the fluctuations as well as the mean values. The actual measurements have been carried out in the various different types of turbulent mixing regions produced by axisymmetric jets. Helium and carbon dioxide gases are individually issued into still air. The types of jets treated here are impinging, coaxial, pulsating, and free jets. In any case, the mean and fluctuating values of concentration and velocity are compared to the those of the free jet. The concentration and velocity distributions are functions of the issuing and surrounding gas densities, and also change by the types of jets.