Measurement of Activity Coefficients from Unsteady State Evaporation and Growth of Microdroplets

Autor:	Asit K. Ray, Haohua Tu
Rok vydání:	2005
Předmět:	Activity coefficient Saturation ratio chemistry.chemical_compound chemistry General Chemical Engineering Evaporation Glycerol Analytical chemistry General Chemistry Dynamic equilibrium Light scattering Water vapor Gas phase
Zdroj:	Chemical Engineering Communications. 192:474-498
ISSN:	0098-6445
DOI:	10.1080/00986440590477845
Popis:	Techniques are presented for determination of activity coefficients of binary systems from unsteady state evaporation and growth of single microdroplets in controlled environments. A high-precision light scattering method based on resonances observed in light scattering by microdroplets was used to determine the size and composition of a microdroplet as functions of time. The techniques were validated through data on growth of glycerol microdroplets in slowly developing water vapor concentration fields and evaporation of microdroplets, containing volatile dimethylphthalate (DMP) and nonvolatile dioctylphthalate (DOP), in vapor-free atmospheres. When the water vapor concentration in the surrounding gas changes slowly a glycerol droplet maintains a dynamic equilibrium with the water vapor; thus the activity coefficient of water was determined from knowledge of the droplet composition and the water vapor saturation ratio in the gas phase. The activity coefficients of DMP were determined on the basis...
Databáze:	OpenAIRE
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