inear graph paper while in Fig. 1(b) cumulative size distribution, i.e. the total percentage less than the specified particle size, is shown on semi-logarithmic scale.
3.1. Effectofparticlesizeonthepercentageofremovalefficiency
In Fig. 3 the effect of particle size on the removal efficiency is depicted for different inlet air flow rates while employing a fixed water flow rate of 100 l/h. By increasing the particle sizes, higher removal efficiency has been obtained. This figure shows that the removal efficiency has a sharp increase by increasing the particle size. Large particles moving toward the droplets have mass, and therefore momentum, which causes each particle to travel in a straight line toward the droplet. The particle leaves the streamline as the streamline bends to move around the droplet. The greater the mass of the particle the more likely that it will travel in a straight line. Also, as the velocity difference between the particle and the droplet increases, the particle will have increased momentum and will be more likely to be carried into the droplet. The radius of cur- vature of the bend in the streamline has a very important effect on the probability that a particle will be carried into the droplet. The smaller the radius of curvature, the less likely that a particle will fol- low the streamline [18]. Therefore, small droplets are more likely to be impacted than large droplets. Since the larger particles have the greater momentum than the smaller ones, this will provide more effective penetration between water droplets and larger PVC parti- cles. Moreover, logically the chance of the contact between a large particle and a water droplet is higher than those of smaller ones.