Mine disasters occur predominantly due to methane or coal dust explosion or a combination of both. Among the top ten worst coal mine disasters in India, nine are due to coal dust explosion. The current paper describes a general overview of the parameters causing dispersion leading to coal dust explosion, and computational fluid dynamics (CFD) simulation study to observe the effects of particle size on dispersion in Indian coal mines. Turbulent kinetic energy (TKE) and velocity vector path of dust-air mixture and dust-free air were simulated to understand their effects on coal dust dispersion. The TKE contours and velocity vector paths for dust-free air were uniform and symmetrical due to resistance-free path available. The TKE contours and velocity vector paths for dust-air mixture shows the asymmetrical distribution of contours, due to entrainment of air with dust particles. Vortices were observed in velocity vector paths which gradually diminish on increment of time sequence. These vortices are dead centres where velocity and coal dust particles concentration are both zero.

煤矿灾害主要是由于甲烷或煤尘爆炸或两者结合而发生的。在印度十大最严重的煤矿灾害中，有九起是由于煤尘爆炸造成的。本文介绍了导致煤粉爆炸的弥散参数的一般概述，以及计算流体力学（CFD）模拟研究，以观察粒径对印度煤矿弥散的影响。模拟了粉尘-空气混合物和无尘空气的湍动能（TKE）和速度矢量路径，以了解它们对煤粉尘扩散的影响。无尘空气的TKE轮廓和速度矢量路径由于无阻力路径而均匀且对称。灰尘-空气混合物的TKE等高线和速度矢量路径显示等高线的不对称分布，由于夹带了灰尘的空气。在速度矢量路径中观察到涡流，随着时间序列的增加，涡流逐渐减小。这些涡流是死点，速度和煤尘颗粒浓度均为零。