Spray Characteristics of a Liquid-Liquid Coaxial Swirl Atomizer at Different Mass Flux Ratios

An experimental investigation is performed to explore the characteristics of sprays produced by a liquid-liquid coaxial swirl injector in a non-combusting environment. Phase Doppler anemometry is used for the measurement of velocity and Sauter mean diameter of droplets across and along the injection axis for various innerand outer mass flow rates. Results of the combined spray are compared with those of innerand/or outer spray alone. The results indicate that the inner injector has a larger influence on the flowfield of the combined spray compared to the outer one. Further, the maximum velocity of the combined spray is close to the center of the spray thickness and decreases as the distance from the nozzle exit is increased. However, the maximum Sauter mean diameter of droplets along the injection axis moves to the outer periphery and increases as the distance from the nozzle exit is increased. 1 Assistant Professor 2 Associate Professor 3 Associate Professor 4 Ph.D. Student 2 Furthermore, the combined spray flowfields are fluid dynamically similar in terms of the velocity and the average Sauter mean diameter of the droplets.