Ultrasound emulsification: Effect of ultrasonic and physicochemical properties on dispersed phase volume and droplet size

Abstract

Ultrasonic emulsification of oil and water was carried out and the effect of irradiation time, irradiation power and physicochemical properties of oil on the dispersed phase volume and dispersed phase droplet size has been studied. The increase in the irradiation time increases the dispersed phase volume while decreases the dispersed phase droplets size. With an increase in the ultrasonic irradiation power, there is an increase in the fraction of volume of the dispersed phase while the droplet size of the dispersed phase decreases. The fractional volume of the dispersed phase increases for the case of groundnut oil-water system while it is low for paraffin (heavy) oil-water system. The droplet size of soyabean oil dispersed in water is found to be small while that of paraffin (heavy) oil is found to be large. These variations could be explained on the basis of varying physicochemical properties of the system, i.e., viscosity of oil and the interfacial tension. During the ultrasonic emulsification, coalescence phenomenon which is only marginal, has been observed, which can be attributed to the collision of small droplets when the droplet concentration increases beyond a certain number and the acoustic streaming strength increases.

Investigation of Impact Factors on the Treatment of Oily Sludge using a Hybrid Ultrasonic and Fenton's Reaction Process

“…When the initial sludge content was high in the US/Fenton treatment system, the viscosity of bulk liquid also increased. The increased viscosity could lead to the impedance of the formation and collapse of cavitation bubbles, and thus decrease the ultrasonic desorption of petroleum hydrocarbons [16]. For example, the TPH reduction rate ranged from 51.9% to 88.1% at level 1 (i.e.…”

Dynamic Study of Water Droplets in Two Phase Liquid by Ultrasound

“…The R-P equation [2] is modified by introducing the acoustic radiation factor by Prospertti A., but these are the motions of tiny bubbles in the liquid. In the real life, the two-phase system of liquid-liquid two-phase system or membrane isolation under ultrasonic action is often encountered, such as: ultrasonic catalytic emulsification system [3], ultrasound in the life of the cell membrane in the transport of substances and energy transmission [4], how the ultrasound effect of soft matter droplets (such as: gels, vesicles, etc.) will be change?…”

Treatment of refinery oily sludge using ultrasound, bio-surfactant, and advanced oxidation processes.

“…This w ould facilitate the contact o f hydroxyl radicals with the petroleum hydrocarbons. In addition, the ultrasonic irradiation could promote the desorption o f petroleum hydrocarbons from the solid phase and their subsequent dispersion into the liquid phase (Gaikwad et al, 2008). T he dispersion o f petroleum hydrocarbons in the bulk liquid could also enhance the contact o f petroleum hydrocarbon m olecules with the free hydroxyl radicals, and thus facilitate the oxidation reactions.…”