Revisiting the Rayleigh-Plateau instability for the nanoscale

被引:46
作者
Zhao, Chengxi [1 ]
Sprittles, James E. [2 ]
Lockerby, Duncan A. [1 ]
机构
[1] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England
[2] Univ Warwick, Math Inst, Coventry CV4 7AL, W Midlands, England
基金
英国工程与自然科学研究理事会;
关键词
breakup; coalescence; capillary flows; non-continuum effects; IRREVERSIBLE-PROCESSES; MOLECULAR-DYNAMICS; INTERFACE;
D O I
10.1017/jfm.2018.950
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The theoretical framework developed by Rayleigh and Plateau in the 19th century has been remarkably accurate in describing macroscale experiments of liquid cylinder instability. Here we re-evaluate and revise the Rayleigh-Plateau instability for the nanoscale, where molecular dynamics experiments demonstrate its inadequacy. A new framework based on the stochastic lubrication equation is developed that captures nanoscale flow features and highlights the critical role of thermal fluctuations at small scales. Remarkably, the model indicates that classically stable (i.e. 'fat') liquid cylinders can be broken at the nanoscale, and this is confirmed by molecular dynamics.
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页数:11
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