Accession Number : ADA332874

Title :   Determination of Structure, Temperature and Concentration in the Near-Injector Region of Impinging Jets Using Holographic Techniques

Descriptive Note : Final rept. 1 Jun 95-30 Apr 97

Corporate Author : ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OFMECHANICAL ENGINEERING

Personal Author(s) : Poulikakos, Dimos

PDF Url : ADA332874

Report Date : 01 DEC 1997

Pagination or Media Count : 27

Abstract : The purpose of this research is to study the fluid dynamics of the dense region of impinging jet atomizers using a novel holographic technique which is able to penetrate this region and to record reliably the non-spherical liquid elements which populate it. During the second year of the research significant progress was made in the study of both low and high speed impingement. The effect of several parameters such as the impingement angle, the liquid jet velocity, and the orifice diameter on the atomization process was investigated. It was shown that in the dense spray region the liquid elements were indeed non-spherical. Smaller and faster droplets were generated with larger impingement angles, higher jet velocities, and smaller orifice diameters. The structure of the liquid elements near the jet impact point is indicative of the mechanisms of the disintegration process. The structure of the dense spray region clearly indicated that utilization of automated techniques that assume that the droplets are spherical for measurements in this region is not appropriate. The data from the holography experiments were used to show that the Universal Root - Normal Distribution is successful in describing the dense spray region. In the coming year the work will focus on the effect of fluid properties and environment temperature on the atomization process.

Descriptors :   *TEMPERATURE, *STRUCTURES, *HOLOGRAPHY, *DROPS, *CONCENTRATION(COMPOSITION), *FLUID DYNAMICS, *LIQUID JETS, *ATOMIZATION, *IMPINGEMENT, AUTOMATION, LOW VELOCITY, LASER APPLICATIONS, HIGH DENSITY, INJECTORS, UTILIZATION, DETERMINATION, JET FLOW, SPRAYS, IMPACT POINT, NORMAL DISTRIBUTION, ORIFICES, DISINTEGRATION.

Subject Categories : Fluid Mechanics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE