Equations traditionally used to calculate the rate of micromixing and the maximum stable drop size in a dispersion take no account of intermittency.
The sampling and measurement procedure was found to be highly reproducible with a standard deviation for the maximum stable drop size for independent experiments of approximately 10%.
Since the maximum stable drop diameter in a break-up controlled dispersion is directly correlated with turbulence intensity, the measurement of drop sizes can enable an indirect access to the intensity of turbulence under such operating conditions.
This work presents the constraints and the development of a method for the measurement of maximum stable drop size in aerated liquid liquid dispersions in stirred tanks for the purpose of characterizing turbulence intensity.
Kumar et al. (1991, Chem. Engng Sci. 46, 2483 2489) have shown that in a stirred vessel, size of the largest stable drop, dmax, first increases with φ (holdup of the dispersed phase) at low φ, but decreases with φ at high φ.
Finally, the temperature was raised to 90 °C with the same LS water until a stable pressure drop occurred across the core, and no oil recovery was observed.
To obtain a stable Cassie drop, the condition that the pillar height must be higher than the sag height of the meniscus is a necessary, yet not a sufficient, condition.
This relationship comes from the assumptions that d32 is a constant fraction of dmax, where dmax is the maximum stable drop size and that dmax can be predicted from theoretical considerations if Kolmogoroffs theory of isotropic turbulence is used for estimating the disruptive forces.
The maximum stable drop diameter ds derived from the model, shows a dependence of NWe−0.6.
A viscous silicone oil was dispersed in the jet and the measured maximum stable drop size was compared with predictions based on the maximum energy dissipation rates.
