Primary breakup in gas/liquid mixing layers for turbulent liquids
Primary breakup in gas/liquid mixing layers for turbulent liquids
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DOI：
10.2514/6.1992-462
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发表时间：
1992-01
期刊：
影响因子：
--
通讯作者：
P. Wu;L. Tseng;G. Faeth
中科院分区：
文献类型：
--
作者：
P. Wu;L. Tseng;G. Faeth
An experimental study of primary breakup of turbulent liquids in gadliquid mixing layers is described. The experiments involved mixing layers along large liquid jets (3.6.6.4 and 9.5 mm dia.) injected at various velocities into still air at atmospheric pressure with fully-developed turbulent pipe flow at the jet exit. Liquids studied included water, glycerol (42% glycerin by mass) and n-heptane. Pulsed shadowgraph photography and holography were used to find conditions where turbulent primary breakup was initiated and drop sizes and velocities after primary breakup. Drop sizes after primary breakup satisfied Simmons' universal root normal distribution and can be characterized solely by their SMD. Mass weighted mean streamwise and crosstream drop velocities after primary breakup were comparable to mean streamwise and crossweam rms fluctuating velocities in the liquid, respectively, with effects of mean velocity distributions in the jet passage reflected by somewhat lower streamwise drop velocities near the jet exit. Conditions for the initiation of turbulent primary breakup and the variation of SMD with distance from the jet exit were correlated reasonably well by a phenomenological analyses considering effects of surface tension and liquid turbulence properties alone. However, limited data in the literature indicates that aerodynamic effects begin to influence drop sizes after primary breakup at ambient pressures greater than atmospheric pressure.
