372
K. R. Arun
Fig. 2 Variation of SMD with different downstream positions
4 Result and Discussion
Figure 3 shows the variation of SMD with respect to MFR at different downstream
positions. From this plot, it is clear that in each injector configuration at all downstream positions, Sauter Mean Diameter (SMD, D32) increases as momentum flux
ratio (MFR) increases. When MFR increases, the velocity of the gas flow decreases
and when MFR decreases, velocity of gas flow increases. In the range of MFR the
mass flow rate of the liquid and hence the velocity of liquid jet is fixed and GN2
is varied and hence the gas velocity changes according to change in mass flow rate
of GN2. Atomization characteristics of the injector will mainly depend on the gas
flow velocity. At low MFR, the aerodynamic force acting on the liquid jet is more
and hence the liquid jet tends to disintegrate into finer drops with large penetration.
At high MFR, the aerodynamic force acting on the liquid jet is less and hence the
Fig. 3 Variation of SMD with different MFR