期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 249, 期 2, 页码 351-358出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jcis.2002.8284
关键词
elastic light scattering; electrodynamic balance; evaporation, mass transfer; oscillation
The enhancement of mass transfer from single oscillating aerocolloidal droplets having initial diameters similar to40 mum has been measured using electrodynamic levitation to trap and oscillate a droplet evaporating in nitrogen gas. The frequency and amplitude of the oscillation were controlled by means of ac and dc fields applied to the ring electrodes of the electrodynamic balance (EDB). Elastic light scattering was used to size the droplet. It is shown that the mass transfer process for a colloidal or aerocolloidal particle oscillating in the Stokes flow regime is governed by a Peclet number for oscillation and a dimensionless oscillation parameter that represents the ratio of the diffusion time scale to the oscillation time scale. Evaporation rates are reported for stably oscillating droplets that are as much as five times the rate for evaporation in a stagnant gas. The enhancement is substantially larger than that predicted by quasi-steady-flow mass transfer. (C) 2002 Elsevier Science (USA).
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