THICKNESS VARIATION OF A LIQUID SHEET FORMED BY 2 IMPINGING JETS USING HOLOGRAPHIC-INTERFEROMETRY

In the work presented in this paper a real time holographic interferom etry technique is developed to measure instantaneously and nonintrusiv ely the thickness distribution of a liquid sheet formed by the impinge ment of two liquid jets. The experimental results are compared with ea rlier largely unverified analytical predictions. It is shown that the assumption that the sheet thickness is inversely proportional to the r adial distance from the impingement point is in principle good The dep endence of the theoretically obtained proportionality constant on the azimuthal angle, however, while exhibiting the same tl end it also sho ws some quantitative differences. Reasons are given in the context of the work. In addition, a weak effect of the jet velocity on the propor tionality constant is Sound to exist. In the theories no such effect w as modeled Finally, comparisons between theoretical and experimental i sothickness contours show differences. Overall, there appears to be a justification for improved theoretical studies including effects such as that of gravitation.