Accession Number : ADA181927

Title :   Spray Formation: 3D Liquid Breakup Due to Surface Tension.

Descriptive Note : Annual technical rept. 1 Apr 86-31 Mar 87,

Corporate Author : NIELSEN ENGINEERING AND RESEARCH INC MOUNTAIN VIEW CA

Personal Author(s) : Childs,Robert E ; Mansour,Nagi N

PDF Url : ADA181927

Report Date : 11 May 1987

Pagination or Media Count : 6

Abstract : The objective of the work was the investigation of fluid dynamic and surface tension instabilities that effect the breakup of fuel jets in the atomization process. Computational and analytical methods were used. Initial work involved the evaluation of numerical methods for flows with density discontinuities. It was discovered that many commonly used methods are poorly suited to predicting two phase flows. However, a suitable method was found, and it was programmed in a Navier-Stokes prediction code. The code has passed some accuracy tests, and others are ongoing. Predictions of simple one and two phase flows were conducted as part of these tests. A method for computing surface tension effects was included in the prediction algorithm, but further work is ongoing to make the method more robust. A inviscid stability analysis of an expanding-radius liquid tubular jet was performed. It was found that no new instability mechanisms are introduced by the rate of change of radius. A viscous stability analysis of a shear layer with a discontinuity in density was initiated and will be continued. Keywords: Liquid jets, Mathematical models.

Descriptors :   *LIQUID JETS, *SPRAYS, ACCURACY, TEST METHODS, NUMERICAL METHODS AND PROCEDURES, INVISCID FLOW, STABILITY, MATHEMATICAL MODELS, ALGORITHMS, PREDICTIONS, LAYERS, ATOMIZATION, DENSITY, DISCONTINUITIES, CODING, NAVIER STOKES EQUATIONS, SHEAR PROPERTIES, INTERFACIAL TENSION, TWO PHASE FLOW, INTERFACIAL TENSION, SURFACE PROPERTIES, VISCOSITY

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE