Coalescence frequencies in agitated liquid‐liquid systems

Abstract

A. J. An experimental technique is described for estimating the coalescence frequency of droplets in an agitated liquid-liquid system. Results are presented for dilute aqueous dispersions in toluene. Quantitative estimates of the coalescence frequency are based upon a simple model proposed to describe the coalescence process. The coalescence frequency is shown t o increase markedly with increase in impeller speed and to a lesser extent with increase in the dispersed-The studies reported here were con-~ Glenn L. Damerell is with €he Minnesota Mining and hlanufacturing Company, St. Paul, Minnesota. Vol. 8, No. 2

Coalescence of Protein-Stabilized Emulsions in a High-Pressure Homogenizer

“…coalescence rates of pure liquid-liquid dispersions in stirred systems (2)(3)(4)(5). Mousa and van de Ven (6) have determined tion for the average drop size in terms of homogenizer pressure for dilute emulsions.…”

Pipeline flow of unstable and surfactant‐stabilized emulsions

“…The dispersed droplets of the unstable emulsions continually undergo coalescence and breakup processes in a turbulent field. Several articles (Hinze, 1955;Shinnar and Church, 1960;Shinnar, 1961;RajaGopal, 1968;Madden and Damerell, 1962;Howarth, 1964) investigate these processes in turbulent flow of dilute emulsions, although most of them have aimed at prediction of either maximum droplet size or the coalescence frequency of droplets in a turbulent field. In the presence of dynamic coalescence and breakup processes, the turbulence of the carrier fluid (continuous phase) is likely to be modified significantly, resulting in drag reduction behavior.…”

Mixing of stabilised drops in suspension polymerisation

“…Madden and Daramell (1962) deÿned the coalescence rate, F, as the volume of coloured drops coalescing with uncoloured drops per unit time. Alvarez et al (1994) expressed F in terms of a coalescence e ciency function, c .…”