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IMPACT OF COMPOUND DROPS ON A PLANE SOLID: ROLE OF THE CORE DIAMETER
Atomization and Sprays ( IF 1.2 ) Pub Date : 2022-01-01 , DOI: 10.1615/atomizspr.2021038825
Amrit Kumar , Deepak Kumar Mandal

The impact of water-in-Jatropha biodiesel compound drops on a solid surface is examined. The effects of variation of the core drop diameter (or the volume fraction, α) and the impact velocity (or Weber number, We) of the compound drops on the outcomes of the impact are reported. With an increase in α, there is a change in the interaction of inertia, viscous and surface forces resulting in interesting changes in the impact dynamics. The maximum spreading factor (βmax), the average spreading rate, and the receding are observed to depend on the volume fraction. βmax increases with the rise in α due to reduced viscous dissipation in the drop. The low volume fraction compound drops do not show any significant receding after βmax. However, significant receding is observed at higher α as water has very high surface tension. The water core recedes over the Jatropha biodiesel shell film deposited on the solid, resulting in double lamella formation. The compound drops of very high α show breakup of the core drop during receding at high We, resulting in deposition of small secondary core droplets on the shell film. The normal average spreading rate first decreases with the rise in α and then increases again when α rises to very high values.

中文翻译:

复合液滴对平面固体的影响:芯径的作用

检查了麻风树生物柴油化合物滴水对固体表面的影响。报告了复合液滴的核心液滴直径(或体积分数,α)和冲击速度(或韦伯数,We)的变化对冲击结果的影响。随着 α 的增加,惯性力、粘性力和表面力的相互作用会发生变化,从而导致冲击动力学发生有趣的变化。观察到最大扩展因子 (β max )、平均扩展速率和后退取决于体积分数。由于下降的粘性耗散减少,β max随 α 的增加而增加。低体积分数化合物滴在 β max后没有表现出任何明显的后退. 然而,由于水具有非常高的表面张力,在较高的 α 下观察到显着的后退。水核在沉积在固体上的麻风树生物柴油壳膜上后退,导致双薄片形成。非常高 α 的化合物液滴在高 We 下后退期间显示出核心液滴的破裂,导致小的次级核心液滴沉积在壳膜上。正常的平均铺展率首先随着 α 的增加而下降,然后当 α 上升到非常高的值时再次增加。
更新日期:2021-12-04
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