Lifetime of a Nanodroplet: Kinetic Effects and Regime Transitions

Autor:	Anirudh Singh Rana, Duncan A. Lockerby, James E. Sprittles
Rok vydání:	2019
Předmět:	Physics Mean free path General Physics and Astronomy Order (ring theory) Rarefaction Radius Knudsen layer Kinetic energy QP 01 natural sciences QA76 Physics::Fluid Dynamics TA 0103 physical sciences Kinetic theory of gases Boundary value problem Atomic physics 010306 general physics
Zdroj:	Physical Review Letters. 123
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.123.154501
Popis:	A transition from a ${d}^{2}$ to a $d$ law is observed in molecular dynamics (MD) simulations when the diameter ($d$) of an evaporating droplet reduces to the order of the vapor's mean free path; this cannot be explained by classical theory. This Letter shows that the $d$ law can be predicted within the Navier-Stokes-Fourier (NSF) paradigm if a temperature-jump boundary condition derived from kinetic theory is utilized. The results from this model agree with those from MD in terms of the total lifetime, droplet radius, and temperature, while the classical ${d}^{2}$ law underpredicts the lifetime of the droplet by a factor of 2. Theories beyond NSF are also employed in order to investigate vapor rarefaction effects within the Knudsen layer adjacent to the interface.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b7f3a947bab399790f21d1113d5ac33 https://doi.org/10.1103/physrevlett.123.154501 Zobrazit plný text záznamu