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Evaporation-induced saline Rayleigh convection inside a colloidal droplet SCIE SCOPUS

Title
Evaporation-induced saline Rayleigh convection inside a colloidal droplet
Authors
Kwan Hyoung KangHee Chang LimHee Woong LeeLee, SJ
Date Issued
2013-04
Publisher
AMER INST PHYSICS
Abstract
Inside evaporating two-component sessile droplets, a family of the Rayleigh convection exists, driven by salinity gradient formed by evaporation of solvent and solute. In this work, the characteristic of the flow inside an axisymmetric droplet is investigated. A stretched coordinate system is employed to account for the effect of boundary movement. A scaling analysis shows that the flow velocity is proportional to the (salinity) Rayleigh number (Ra-s) at the small-Rayleigh-number limit. A numerical analysis for a hemispherical droplet exhibits the flow velocity is proportional to the non-dimensional number Ra-s(1/2), at high Rayleigh numbers. A self-similar condition is established for the concentration field irrespective of the Rayleigh numbers after a moderate time, and the flow field is invariant with time at this stage. The scaling relation for the high Rayleigh numbers is verified experimentally by using aqueous NaCl droplets. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4797497]
URI
https://oasis.postech.ac.kr/handle/2014.oak/12555
DOI
10.1063/1.4797497
ISSN
1070-6631
Article Type
Article
Citation
Physics of Fluids, vol. 25, no. 4, page. 42001, 2013-04
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이상준LEE, SANG JOON
Dept of Mechanical Enginrg
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