An Investigation of a Coaxial Annular Jet in a Circular Tube

Abstract

Computational calculations and experiments for laminar coaxial annular jets in a circular tube were carried out. From computational calculations using the method developed by Enzo O. Macagno, two flow patterns were obtained under the same boundary conditions. In one of them, the jet curved and attached to the side wall. In the other, the jet curved to the center line, and did not attach to the side wall. Experiments showed that two flow patterns similar to the results of calculations were obtainable. The results mentioned above are thought to be phenomena analogous to the Coanda effects.