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为了探究煤油凝胶液滴破碎的时间和空间分布特性,采用高速摄像机拍摄破碎过程,获得在不同气流速度下煤油凝胶液滴的破碎特征、流动参数对破碎时间和破碎区域的影响。结果表明:随着韦伯数(We)增大,煤油凝胶液滴依次发生与煤油(牛顿流体)液滴相同的破碎模态,且模态转换We随着胶凝剂含量的增加而提高。三种煤油凝胶的总破碎时间和初始破碎时间的比值(Ttot/Tini)均随奥内佐格数(Oh)的升高而降低,且均趋近于牛顿流体的该值(3.125)。在破碎结束时,横向破碎区域随着We数的升高而扩大,且胶凝剂含量越低范围越大;纵向破碎区域随着We数升高会扩大到一个极值,胶凝剂含量为1%和2%的煤油凝胶,破碎区域和初始液滴直径的比值趋于20,胶凝剂含量为3%时,该值趋近17。
In order to explore the time and space distribution characteristics of kerosene gel droplet breakage, the high speed camera was used to photograph the crushing process, and the crushing characteristics of kerosene gel droplets at different air velocity and the influence of flow parameters on crushing time and crushing area were obtained. The results show that with the increase of the Weber number, the kerosene gel droplets have the same crushing modes as the kerosene (Newtonian fluid) droplets in turn, and the mode transition We increases with the increase of the gelling agent content. The ratios of total to crushing time and initial crushing time (Ttot / Tini) of the three kerosene gels decreased with the increase of Ohnezog number (Oh), and all approached the value of Newtonian fluid (3.125). At the end of the crushing, the transversely crushed area broadens with the increase of the We number, and the lower the content of the gelling agent is, the larger the longitudinal crushing area is. As the Weer number increases, the crushed area expands to an extreme value. The gelling agent content is The ratios of 1% and 2% kerosene gel, broken area and initial droplet diameter tended to be 20, and at a gelling agent content of 3% the value approached 17%.