ABSTRAKT

The interaction of an air jet in liquid water cross-flow in the vicinity of a gas injector was experimentally investigated using high-speed shadowgraphy. A turbulent, fully developed water flow, with superficial water velocity values of 1.9-4.3 m/s, was circulated through a 12.7-mm square channel of 118 cm in length. Three gas nozzles, with diameters of 0.27 mm, 0.52 mm, and 1.59 mm, were used to inject the air perpendicularly into the water flow. The gas mass flow rates ranged from 10-60 × 10^-3 g/s. An image-processing algorithm was used to estimate the incipient centerline and borderline trajectories of the gas phase during its initial interaction with the liquid. Experimental results were compared with existing correlations developed for standard jets in a cross-flow and showed limited agreement. The lack of correlation specifically for gas jets in a cross-flowing liquid is substantial. For this reason, original empirical expressions based on dimensionless parameters were introduced. The assessment of the correlations indicated a dependable prediction of the initial centerline and borderline trajectories of the gas jet in liquid.