The development of eﬃcient nanoﬂuidic devices requires driving mechanisms that provide controlled transport of ﬂuids through nanoconduits. Temperature gradients have been proposed as a mechanism to drive particles, fullerenes and nanodroplets inside carbon nanotubes (CNTs). In this work, molecular dynamics (MD) simulations are conducted to study thermophoresis of water nanodroplets inside CNTs. To gain insight into the interplay between the thermophoretic force acting on the droplet and the retarding liquid-solid friction, sets of constrained and unconstrained MD simulations are conducted. The results indicate that the thermophoretic motion of a nanodroplet displays two kinetic regimes: an initial regime characterized by a decreasing acceleration and afterwards a terminal regime with constant velocity. During the initial regime, the magnitude of the friction force increases linearly with the droplet velocity whereas the thermophoretic force has a constant magnitude deﬁned by the magnitude of the thermal gradient and the droplet size. Subsequently, in the terminal regime, the droplet moves at constant velocity due to a dynamic balance between the thermophoretic force and the retarding friction force.
|Number of pages||1|
|Publication status||Published - 2017|
|Event||70th Annual Meeting of the American Physical Society Division of Fluid Dynamics (DFD17) - Denver, United States|
Duration: 19 Nov 2017 → 21 Nov 2017
|Conference||70th Annual Meeting of the American Physical Society Division of Fluid Dynamics (DFD17)|
|Period||19/11/2017 → 21/11/2017|