摘要
针对矿井煤尘难以润湿的特点,考虑到煤尘与液滴间分子作用力和煤尘表面渗流的特性,采用格子Boltzmann方法(LBM),从减小液滴表面张力方面对煤尘润湿接触角和润湿时间进行数值模拟,同时实验测定煤尘的润湿性。结果表明:LBM数值模拟和润湿实验得到的规律一致,减小液滴表面张力能够大幅度地提高煤尘润湿性,当表面张力减小到小于25 m N/m时,煤尘表现为完全润湿;通过实验测试不同表面张力的液滴与降尘效率的关系,煤尘润湿性越好,降尘效率越高,进一步验证了LBM数值模拟的合理性。
According to the characteristics that dusts were difficult to be wetted, considering the force of dusts and liquid molecules and the seepage of dust surface, the dust wetting contact angle and wetting time were simulated as reducing of the droplet surface tension by using lattice Boltzmann method （LBM）. The dust wettability was also measured. The results show that both of LBM numerical simulation and the experiment obtain a consistent conclusion. Reducing the surface tension of droplets can improve dust wettability of a lot. When the surface tension is less than 25 mN/m, dusts are completely wetted. The relation between different surface tension of droplets and dust-fall efficiency is tested in mine. The better the wettability of dusts is , the better the dust-fall efficiency is, which verifies that LBM numerical simulation is reasonable further.
出处
《中国粉体技术》
CAS
北大核心
2015年第2期86-89,共4页
China Powder Science and Technology
