Kinetics of oil dispersion in the absence and presence of block copolymers

Abstract

A phenomenological model proposed describes droplet breakup in the turbulently agitated lean oil-in-water dispersions and pro®ides a correlation between the median droplet size in an agitated

Electrostatic Charge on Spray Droplets of Aqueous Surfactant Solutions

“…Spontaneous charging of droplets can be caused by the development of a double layer due to the presence of ions dissolved in water (Lenard, 1892;Chapman, 1937Chapman, , 1938aIribane and Mason, 1967;Bailey, 1988), statistical #uctu-ation of electrolytic ion concentration among the droplets (Chapman, 1934;Dodd, 1952), contact electri"cation between the solution and the surrounding material (Vick, 1953;Byrne, 1977) and capture of ions from air (White, 1951;Liu et al, 1987;Pearse and Pope, 1977;Polat et al, 1993Polat et al, , 1996. These mechanisms may act simultaneously in charging a droplet.…”

Kinetics of emulsification of dodecane in the absence and presence of nonionic surfactants

“…The analysis is based on light scattering method. Schematic of the experimental set-up is given in another publication [4]. It contains a 2.5 l vessel of standard geometry [5] with four baffles.…”

“…(2), ρ is the density of the continuous phase, N the stirrer speed and γ the oil-water interfacial tension. Polat et al [4] developed a phenomenological emulsification model based on the study of Hinze [2]. The model, given by Eq.…”

“…Droplet size distribution of dodecane droplets was measured by Malvern particle size analyser. A phenomenological model developed by Polat et al [4] was used to present the emulsification data.…”

Urea as promoter in the soap flotation of phosphate ores

“…Improved oil dispersion produces finer and finer droplets which increase the probability of collisions between particles and oil droplets which in turn increases the recovery. Polat et.al [6] studied emulsification of dodecane oil in the presence of various triblock co-polymers. It was measured that the addition of copolymers reduced the median oil droplet size significantly.…”