F-1517 Visualization of Two-Phase Flows in a Twin-fluid Atomizer

Abstract

Flow structure in a twin-fluid atomizer with a mixing chamber was visualized with a pulsed light source and a 35 mm still camera, and droplet size distributions of the spray were measured by the immersion liquid method, in order to study effects of the flow structure on the spray. The obtained pictures revealed that the flow in the mixing chamber might be divided into two regions: water rich region close to the wall and air rich region in the core. It was found that in the case where the thickness of the water rich region decreased as the flow approached the entrance of the nozzle, the resultant spray had smaller diameters of droplets.