Accession Number : AD0807293

Title :   COALESCENCE OF SINGLE DROPS AT LIQUID-LIQUID AND LIQUID-SOLID INTERFACES.

Descriptive Note : Technical rept. 15 Oct 65-15 Oct 66,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Weatherford, W. D., Jr

Report Date : FEB 1967

Pagination or Media Count : 64

Abstract : As part of a research and development program on fuel handling and decontamination, a study is being conducted to develop a better understanding of the basic phenomena involved in filter-separator operation. This study has led to the development of a new analytical model of coalescence processes. The model is based upon considerations of the dynamics of molecular processes in the vicinity of interfaces (either liquid-liquid or liquid-solid) and includes film-drainage as well as interface-coalescence phenomena. Experimental studies included the use of selected additives in either the aqueous drops and bulk phase or in the hydrocarbon continuous medium, or both. Liquid-liquid interfacial tension was varied from less than 10 to greater than 50 dynes/cm; viscosity of the hydrocarbon phase was varied from less than 1 to greater than 200 centistokes; and the average coalescence time ranged from less than 1 to greater than 300 seconds. The experimentally measured coalescence times and initial rates of contact angle decay have been correlated successfully in terms of the analytical model. (Author)

Descriptors :   (*JET ENGINE FUELS, FLUID MECHANICS), DROPS, LIQUIDS, INTERFACES, FUEL FILTERS, HANDLING, SURFACE PROPERTIES, MOLECULAR PROPERTIES, TRANSPORT PROPERTIES, VISCOSITY, FILMS, TENSILE PROPERTIES, WATER, TWO PHASE FLOW, DRAINAGE.

Subject Categories : Fluid Mechanics
      Fuels

Distribution Statement : APPROVED FOR PUBLIC RELEASE