The Motion of Particles Inside a Droplet
The Motion of Particles Inside a Droplet
复制标题
液滴内粒子的运动
DOI：
10.1115/1.3245112
复制
发表时间：
1982
期刊：
影响因子：
--
通讯作者：
J. Chung
中科院分区：
文献类型：
--
作者：
J. Chung
建立了微粒在具有内循环的液滴内平移的运动方程。还总结了这些粒子所受的力及其相对重要性。煤颗粒在油滴中的样例计算表明，对于高雷诺数的油滴，在油滴大量蒸发之前，颗粒会在油滴表面附近积聚，这是基于输运特征时间比油滴寿命小两个数量级的结果。这些颗粒在液滴表面附近的积聚可能会导致颗粒聚集。低雷诺数时，粒子进行慢循环运动，特征输运时间与液滴寿命相当。这导致液滴中颗粒分布更均匀，表面附近的颗粒密度略高。这表明颗粒燃烧速率更高，并且由于这些煤颗粒引发的非均相成核可能导致内部沸腾和微爆炸。
Equations of motion for particles translating inside a droplet with internal circulation were developed. The forces experienced by these particles and their relative importance are also summarized. Sample calculations for coal particles in oil droplets show that for high-droplet Reynolds numbers, particles will accumulate near the droplet surface before substantial evaporation of the droplet, based on the results that the characteristic time of transport is two orders of magnitude smaller than the droplet lifetime. These accumulations of particles near the droplet surface will probably result in particle agglomeration. Fow low-droplet Reynolds numbers the particles are making slow looping motions and the characteristic time of transport is comparable to the droplet lifetime. This results in a more even distribution of particles in the droplet with slightly higher particle density near the surface. This indicates a higher particle burning rate and the possibility of internal boiling and microexplosion due to heterogenous nucleation initiated from those coal particles.