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dc.contributor.authorWu, Congmin
dc.contributor.authorXu, Xinpeng
dc.contributor.authorQian, Tiezheng
dc.date.accessioned2016-02-28T08:00:14Z
dc.date.available2016-02-28T08:00:14Z
dc.date.issued2013-04-04
dc.identifier.citationWu C, Xu X, Qian T (2013) Molecular dynamics simulations for the motion of evaporative droplets driven by thermal gradients along nanochannels. J Phys: Condens Matter 25: 195103. Available: http://dx.doi.org/10.1088/0953-8984/25/19/195103.
dc.identifier.issn0953-8984
dc.identifier.issn1361-648X
dc.identifier.pmid23552493
dc.identifier.doi10.1088/0953-8984/25/19/195103
dc.identifier.urihttp://hdl.handle.net/10754/600261
dc.description.abstractFor a one-component fluid on a solid substrate, a thermal singularity may occur at the contact line where the liquid-vapor interface intersects the solid surface. Physically, the liquid-vapor interface is almost isothermal at the liquid-vapor coexistence temperature in one-component fluids while the solid surface is almost isothermal for solids of high thermal conductivity. Therefore, a temperature discontinuity is formed if the two isothermal interfaces are of different temperatures and intersect at the contact line. This leads to the so-called thermal singularity. The localized hydrodynamics involving evaporation/condensation near the contact line leads to a contact angle depending on the underlying substrate temperature. This dependence has been shown to lead to the motion of liquid droplets on solid substrates with thermal gradients (Xu and Qian 2012 Phys. Rev. E 85 061603). In the present work, we carry out molecular dynamics (MD) simulations as numerical experiments to further confirm the predictions made from our previous continuum hydrodynamic modeling and simulations, which are actually semi-quantitatively accurate down to the small length scales in the problem. Using MD simulations, we investigate the motion of evaporative droplets in one-component Lennard-Jones fluids confined in nanochannels with thermal gradients. The droplet is found to migrate in the direction of decreasing temperature of solid walls, with a migration velocity linearly proportional to the temperature gradient. This agrees with the prediction of our continuum model. We then measure the effect of droplet size on the droplet motion. It is found that the droplet mobility is inversely proportional to a dimensionless coefficient associated with the total rate of dissipation due to droplet movement. Our results show that this coefficient is of order unity and increases with the droplet size for the small droplets (∼10 nm) simulated in the present work. These findings are in semi-quantitative agreement with the predictions of our continuum model. Finally, we measure the effect of liquid-vapor coexistence temperature on the droplet motion. Through a theoretical analysis on the size of the thermal singularity, it can be shown that the droplet mobility decreases with decreasing coexistence temperature. This is observed in our MD simulations. © 2013 IOP Publishing Ltd.
dc.description.sponsorshipThis publication is based on work supported by Award No. SA-C0040/UK-C0016, made by King Abdullah University of Science and Technology (KAUST), and Hong Kong RGC grant No. 603510. C Wu is also supported by National Natural Science Foundation of China (Project No. 11101343) and Doctoral Fund of Ministry of Education of China (Project No. 20110121120010). We are grateful to Dr Han Wang for his code package GASSER. The MD simulations were performed on the Deepcomp7000G of the Supercomputing Center, Computer Network Information Center of the Chinese Academy of Sciences.
dc.publisherIOP Publishing
dc.titleMolecular dynamics simulations for the motion of evaporative droplets driven by thermal gradients along nanochannels
dc.typeArticle
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Physics: Condensed Matter
dc.contributor.institutionSchool of Mathematical Sciences, Xiamen University, Xiamen 361005, China
dc.contributor.institutionDepartment of Mathematics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
kaust.personQian, Tiezheng
kaust.grant.numberSA-C0040
kaust.grant.numberUK-C0016
kaust.grant.fundedcenterKAUST-HKUST Micro/Nanofluidic Joint Laboratory
dc.date.published-online2013-04-04
dc.date.published-print2013-05-15


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