Droplet Coalescence is Initiated by Thermal Motion

Autor:	Matthew K. Borg, James E. Sprittles, Jason M. Reese, Sreehari Perumanath, Mykyta V. Chubynsky
Rok vydání:	2018
Předmět:	Coalescence (physics) Length scale Physics Capillary wave Flow (psychology) General Physics and Astronomy Radius Mechanics 01 natural sciences Surface tension Physics::Fluid Dynamics Molecular dynamics 0103 physical sciences Thermal QA 010306 general physics
Zdroj:	Perumanath, S, Borg, M, Chubynsky, M, Sprittles, J & Reese, J 2019, ' Droplet coalescence is initiated by thermal motion ', Physical Review Letters, vol. 122, no. 10, 104501, pp. 1-6 . https://doi.org/10.1103/PhysRevLett.122.104501
ISSN:	1079-7114 0031-9007
Popis:	The classical notion of the coalescence of two droplets of the same radius R is that surface tension drives an initially singular flow. In this Letter we show, using molecular dynamics simulations of coalescing water nanodroplets, that after single or multiple bridges form due to the presence of thermal capillary waves, the bridge growth commences in a thermal regime. Here, the bridges expand linearly in time much faster than the viscous-capillary speed due to collective molecular jumps near the bridge fronts. Transition to the classical hydrodynamic regime only occurs once the bridge radius exceeds a thermal length scale l_{T}∼sqrt[R].
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::710b4139236e104e1b4d2a760da17ce9 https://pubmed.ncbi.nlm.nih.gov/30932677 Zobrazit plný text záznamu