Comparative Theoretical and Experimental Studies of Breakup, Outgassing and Stress-Induced Cavitation of Newtonian and Polymerically Thickened Liquids

摘要CTS-0076648 D。D.约瑟夫，明尼苏达大学提出了研究过程中的液体破碎时，提交给气体流引起的应力或空化相关的蒸汽状态。 预计这些效应与高韦伯数或非常低的密度条件有关。 几个额外的影响因素的液体破碎机制将被调查，如形态，分子量和粘弹性。 特别是，已经确定为瑞利-泰勒在激波管研究的不稳定性，现在将考虑从开尔文Helmhoz的观点，为这样的现象，如剥离的一面的下降，毛细管不稳定性的细丝拉出来的下降，空化和放气。这部分研究的重点是解释最终的液滴分布，并通过高速电影和静态照片进行验证。 此外，聚合物增稠的液体在低压条件下的破碎已被证明是非常依赖于增稠剂浓度。 建议检查这种过程对聚合物类型、浓度和其他相关性质的依赖性。

AbstractCTS-0076648D. D. Joseph, University of MinnesotaIt is proposed to investigate the process of liquid fragmentation when submitted to gas flow induced stresses or to cavitation related vapor states. These effects are expected to be associated to high Weber number or very low-density conditions. Several additional contributing factors to the liquid breakup mechanism will be investigated, such as morphology, molecular weights and viscoelastic properties. In particular, the instabilities already identified as Rayleigh-Taylor in shock tube studies, will be now be considered from the Kelvin Helmhoz viewpoint, for such phenomena as stripping the side of the drop, the capillary instability of a filament pulled out of the drop, cavitation and outgassing. The focus of this part of the research is to explain the eventual droplet distribution as validated by high-speed movies and still photographs. Also, the breakup of polymer-thickened liquids under low-pressure conditions has been shown to be very dependent on thickener concentration. It is proposed to examined the dependence of such a process on polymer type, concentration and other related properties.