Abstract
The discharge coefficient (C) of pressure nozzles can be predicted by the nozzle parameters, which are defined by their nozzle geometries. However, in-spite of using suitable nozzle parameters, the prediction of “C” is still influenced by the diameter of the swirl chamber (“di”) itself.
At the case of atomization of low viscosity liquids, “C” decreases with increasing “di”. On the contrary, at the case of atomization of high viscosity liquids, “C”increase with increasing “di”. Also, it is found the transition of these tendencies occurs around the viscosity of 0.06 Pa-s.
The influence of the viscosity of liquids and the spraying pressure on the “C” are arranged by the effect of the Reynolds number at the swirl chamber, which is defind by u* (di-do) /2 ρ.
It is found that the change of the correlation between “C” and Reynolds number occurs around Re=2000-3000.
