Impinging bubbly jets at different gravity levels

Abstract

Bubbly jet impingement have been studied experimentally and numerically in normal gravity and in microgravity conditions. Zero gravity results have been obtained at the ZARM Drop Tower, which allows 4.7 s of a microgravity level of g 10-4g0, where g0 = 9:81 m/s2. In order to generate millimetric bubbles, a slug flow is created inside a capillary T-junction (d = 1 mm inner diameter) prior to injection into a test tank full of distilled water. A detailed study of this bubble generation method is reported in Arias et al. [1]. Bubble size and velocity are controlled via the gas and liquid ow rates. Different separations between jets have been considered (from 50 mm up to 100 mm). Results on the global structure of the impinging jets and the individual behavior of bubbles are presented.

Postprint (published version)