Analysis of water droplet impingement characteristics of three-dimensional cylinder

A three dimensional droplets impingement Euler method procedure is developed in this paper. By analyzing the effects of diffusion coefficient on local collection efficiency, it is concluded that when the diffusion coefficient is 0.001 the local collection efficiency is closest to the reference results and experimental data. Two examples are used to verify the Eulerian simulations. In the cylinder example, the difference of maximum local collection efficiency between our results and the reference is 3%, and the difference of impinging limits is 7%. In the sphere example, the difference of maximum local collection efficiency between our results and the reference is 1%, and the difference of impinging limits is 6.5%. Three-dimensional cylindrical water droplets impingement characteristics are simulated by using Eulerian simulations. The influence of cylinder diameter, freestream velocity and water droplet diameter is analyzed. The results show that in the same conditions the impinging limits increase as the cylinder diameter increases, but the maximum collection coefficient decreases. The impinging limits and the maximum collection coefficient increase as the freestream velocity increased. To the greater the flow velocity,the water collection coefficient increment. The impinging limits and the maximum collection coefficient increases as the droplet diameter increases. Also, the bigger the droplet diameter is, the smaller the water collection coefficient increment does.