DISCHARGE COEFFICIENT OF INTERNAL MIXING TWIN-FLUID ATOMIZERS

FLOW RATE PREDICTION OF TURBULENT TWO-PHASE JET THROUGH AN ORIFICE

Abstract

The internal mixing twin-fluid atomizer, used in many industries, is a sort of twin-fluid atomizer which disintegrates liquid in the atmosphere after mixing liquid and gas within a mixing chamber. However, few investigations of the atomizer having a throat or an orifice port and a mixing chamber have been reported.
In this paper, the discharge coefficient of this type of atomizer is investigted experimentally. The gas-liquid two-phase mixture was treated as a compressible and homogeneous fluid, and the critical pressure P_c and the acoustic velocity were taken into consideration to determine the discharge coefficient.
Two empirical formulas of the discharge coefficient C₀ were obtained for the gas-liquid two-phase jet, as follows:
(a) P_c<1 Kg/cm² (subsonic region)
C₀=0.38×10^-3m^0.466(D₂/D₁)^-0.964Re^0.983(μ_l/μ_w)^0.984
(b) P_c>Kg/cm² (supersonic region)
C₀=0.593×m^0.063(D₂/D₁)^-0.048RE^0.078(μ_l/μ_w)^0.115
Here, the experimental region is W_l=33-180 kg/hr, m=0.001-0.23.