Drag relationships for liquid droplets settling in a continuous liquid

Autor: T. Smith, T. Gyves, Thomas F. Irvine, G. A. Greene
Rok vydání: 1993
Předmět:
Zdroj: AIChE Journal. 39:37-41
ISSN: 1547-5905
0001-1541
Popis: Experiments are reported in which the drag of single liquid droplets settling in a tall column of another lighter immiscible liquid are measured. The experimental data for the eight pairs of liquids that were tested covered a range of droplet Reynolds numbers from 10[sup [minus]3] to 10[sup 4]. Two regimes of droplet settling were encountered. In the first regime, the droplets remained spherical, and the drag agreed very well with established solid sphere drag models. In the second regime, the droplets became deformed and oscillated; the drag was found to depart suddenly from predictions of spherical models and to increase with increasing Reynolds number. Empirical models for the point of departure from spherical drag and the coefficient of drag in the unstable regime are derived. The broad scope of applications for such research includes the analysis of particle motion in fluids, the study of phenomena such as rainfall, boiling and aerosol decontamination, the design of condensing economizers and air pollution control equipment, as well as the design of evaporative coolers and cooling towers.
Databáze: OpenAIRE
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