Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 178, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2021.121584
Keywords
Selective evaporation; Droplet evaporation model; Binary mixture droplet; Surface plasmon resonance imaging
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2020R1A4A4078930]
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This study investigates the selective evaporation characteristics of binary mixture droplets and develops a corresponding evaporation rate model. By analyzing the Rayleigh number, a new evaporation rate model is proposed that includes diffusive and convective evaporation effects. This model shows a strong correlation with the observed selective evaporation behavior over the droplet lifetime.
Despite numerous studies about droplet evaporation dynamics, the development of an accurate model to estimate the evaporation rate has been under debate for several decades. In particular, the selective evaporation characteristics of binary mixture droplets (BMD) have not been investigated well, in spite of its importance in many applications. The present study examines the selective evaporation characteristics of BMDs and develops a corresponding evaporation rate model. Surface plasmon resonance imaging (SPRi) and long-working distance microscopic imaging methods are applied to simultaneously measure ethanol concentration and droplet geometry, respectively, over the droplet lifetime. The evaporation rates of each BMD component are calculated based on concentration measurement. In this study, the Rayleigh number is employed to analyze the effect of free convection on evaporation dynamics. A new evaporation rate model is suggested as a function of the Rayleigh number by involving diffusive and convective evaporation effects. This model shows a strong correlation with the observed selective evaporation behavior over the droplet lifetime. (c) 2021 Elsevier Ltd. All rights reserved.
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