A Numerical Determination of the Efficiency with which Electrically Charged Cloud Drops and Small Raindrops Collide with Electrically Charged Spherical Particles of Various Densities

摘要: Abstract Numerical computations were carried out to determine the efficiency with which electrically charged cloud drops and small raindrops of diameters ranging from 84 866 µm collide particles densities between 1 4 g cm−3 0.4 20 µm. For this purpose, numerical flow fields about rigid spheres Reynolds numbers 1, 10, 20, 100 200 used integrate trajectory particle relative collector drop. Two approximate methods represent electrostatic force drop particle, resulting collision efficiencies show that representation by two point charges is a sufficient approximation for majority cf atmospheric charges, as long diameter larger than 208 typical on observed in atmosphere, attractive forces, results sma...