Technical Brief

Evaporation of a Liquid Droplet in the Presence of a Nanoparticle.

[+] Author and Article Information
Arunkumar V

School of Nano Science and Technology, National Institute of Technology Calicut, Kozhikode 673601, India

Sarith P Sathian

Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India

1Corresponding author.

ASME doi:10.1115/1.4038477 History: Received September 15, 2016; Revised September 17, 2017


Non Equilibrium Molecular Dynamics (NEMD) simulations have been performed to understand the evaporation of a liquid droplet in the presence of a solid nanoparticle. The influence of solid-liquid interaction strength ($\varepsilon_{sl}$) on the evaporation properties was addressed. The system consists of a solid nanoparticle (Platinum) engulfed in a droplet (Argon) in Argon vapor environment. After the equilibration of this nanoparticle embedded droplet with its vapor, the boundary of this system is heated continuously to evaporate the droplet. It is observed that the addition of a nanoparticle to the droplet resulted in a slower evaporation rate when compared to that of a pure droplet. It was found that the evaporation rate of the droplet is decreased with increasing solid-liquid interaction strength ($\varepsilon_{sl}$) and those liquid atoms around the solid nanoparticle with higher $\varepsilon_{sl}$ are able to delay evaporation even at higher temperature owing to its decreased interfacial resistance. In order to analyse further on the vibrational coupling of the solid and liquid atoms, the vibrational density of states (VDOS) of the solid atoms is studied. It is observed that for higher values of $\varepsilon_{sl}$, the particle is able to retain a structured layer of liquid even at high temperature and also a higher heat input is necessitated to break the interaction strength of the liquid molecules around the solid nanoparticle, which makes it possible in delaying the complete evaporation of the droplet.

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