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- W2740511312 abstract "SPRAY KEASURBMENTS OF AEROTHERMODYNA_IC EFFECT ON DISINTEGRATINGLIQUID JETSRobert D. IngeboNational Aeronautics and Space AdministrationLewis Research CenterCleveland, Ohio 44135ABSTRACTAn experimental investigation was made to deter-mine the effect of atomizing-gas mass-flux and tempera-ture on liquid-jet breakup in sonic-velocity gasflow.Characteristic dropsize data were obtained by using thefollowing atomizing-gases: nitrogen, argon and heliumto breakup water jets in high-velocity gasflow. A scat-tered-light scanning instrument developed at NASA LewisResearch Center was used to measure S_D, Sauter meandiameter, i.e., D32. The three gases gave a molecularweight range of 4 to 40 and atomizing-gas mass-flux andtemperature were varied from 6 to 50 g/cm2-s and 275 to400 K, respectively. The ratio of liquid-jet diameterto SMD, DO/D3_, was correlated with aerodynamic andliquid-surface force ratios, i.e., the product of theWeber and Reynolds number, We Re, the gas-to-liquiddensity ratio, Pg/Pl and also the molecular-scaledimensionless group, plV_/pt g, to give the followingexpression:Do/D32 = 0.90_10-8(We Re pg/ / Pt)_0.44__PlVm/#l_r3 / g)0,672_2, 3 jwhere We Re = PgUoVc/pla, #t is liquid viscosity, a issurface tension, V is acoustic gas velocity, Ym isRMS velocity of ga_ molecules, g is acceleration ofgas molecules due to gravity. Good agreement wasobtained with atomization theory for liquid-jet breakupin the regime of aerodynamic stripping. Also, due toits low molecular weight and high acoustic velocity,helium was considerably more effective than nitrogen orargon in producing small-droplet sprays with values ofD32 on the order of 5 _m.NOMENCLATUREAo atomizer orifice area, cm_Di diameter of ith drop, cmDO diameter of liquid jetDa2 Sauter mean drop diameter, _niD _/_niD_, cmk correlation coefficient for gas mass-fluxk' correlation coefficient for Eq. (i)k* correlation coefficient for Eq. (3)molecular weight of gasn number of dropsR gas constant, 8.31 J/kmol KRe Reynolds number, DoflgYc/#lV fluid velocity, cm/sWe Weber number, DoPgV _7 kinematic viscosity, cm2/ssurface tension of liquid relative to air,dynes/cm# absolute viscosity, g/cm sp fluid density, g/am 3Subscripts:c acousticg gasi liquidm molecularINTRODUCTIONLiquid jets of fuel disintegrating into clouds ofvery small drops can create large liquid surface-areasfor highly efficient combustion of fuel sprays in gas-turbine and rocket combustors. However, in order tocalculate vaporization and burning rates of fuel drop-lets, data are needed to characterize the spray interms of dropsize distribution and mean drop sizes suchas the Sauter mean diameter, Ds2. These data can thenbe used to derive mathematical expressions that willadequately describe two-fluid atomization as a processin which a wide variety of liquid fuels and atomizing-" @default.
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- W2740511312 date "1991-01-01" @default.
- W2740511312 modified "2023-09-23" @default.
- W2740511312 title "Aerothermodynamic Effect on Disintegrating Liquid Jets" @default.
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