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

abstractcts - 0076648 d。D. Joseph，明尼苏达大学，被提议研究液体在气体流动诱导应力或空化相关蒸汽状态下破碎的过程。这些影响预计与高韦伯数或非常低密度的条件有关。还将研究影响液体破碎机制的其他因素，如形态、分子量和粘弹性。特别是，激波管研究中已经确定的瑞利-泰勒不稳定性，现在将从开尔文亥姆霍兹的观点来考虑，如剥离液滴的一侧，从液滴中拔出的细丝的毛细不稳定性，空化和放气等现象。这部分研究的重点是解释通过高速电影和静止照片验证的最终液滴分布。此外，聚合物增稠液体在低压条件下的破裂已被证明非常依赖于增稠剂的浓度。研究了这一过程与聚合物类型、浓度和其他相关性质的关系。

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.