湍流场中液滴粒径分布规律研究

he diameter distributions of droplets in turbulence are very important for the process of separating water drops from oil, which has a siginificant influence on the coalescence efficiency. Many researchers have studied the breakage and coalescence of water drops theoretically and experimentally.Researchers at both home and abroad have found that proper intensity of turbulence can enhance the coalescence of water droplets in oil. In this paper, the diameter distributions of droplets in turbulence have been experimentally studied via microscopic high speed photography on the flow field in a standard transparent stirred sample tank. Probability density distribution curve and cumulative probability density distribution curve are plotted separately based on the datas gathered before and after the function of turbulence in the experiment, according to which the influences of water cut and Reynolds number on diameter distribution are obtained. Experiment results indicate that the peak of the probability density distribution curve increase with increasing Reynolds number when the water cut is constant, which means the diameter of droplets are enlarged. But when the critical Reynolds number is reached, water droplets begin to break up into even smaller droplets leading to the decline of peak on the curve. The critical Reynolds number is propotional to water cut and ascends with the increase of water cut in oil.