Bridging the scales near the contact line 1

Duration: 44 mins 55 secs

Share this media item:

Embed this media item:

<iframe width="_width_" height="_height_" src="https://sms.cam.ac.uk/media/1525146/embed" frameborder="0" scrolling="no" allowfullscreen></iframe>

Choose size:

About this item

Available Formats

About this item

Description:	Pismen, L (Technion - Israel Institute of Technology) Tuesday 23 July 2013, 09:30-10:15


Created:	2013-07-24 10:40
Collection:	Mathematical Modelling and Analysis of Complex Fluids and Active Media in Evolving Domains
Publisher:	Isaac Newton Institute
Copyright:	Pismen, L
Language:	eng (English)


Abstract:	Interface is where the macroscopic meets the microscopic; even a simple fluid becomes there a complex fluid. The origins of surface tension and disjoining pressure lie in nanoscale density gradients governed by molecular interactions. We shall see how the paradox of the moving contact line is resolved on the molecular scale when it is viewed as a physico-chemical problem dependent on fluid–substrate interactions. There is enormous scale separation between molecular and hydrodynamic scales, which makes computation difficult but facilitates analytical theory. We ascend from molecular to macroscopic scales - from density functional theory to lubrication equations - by the approximation ladder. Multiscale perturbation theory elucidates dynamics of the contact line and provides tools for the study of various instabilities, as demonstrated taking as an example the motion of droplets driven by surface forces.

Abstract:

Interface is where the macroscopic meets the microscopic; even a simple fluid becomes there a complex fluid. The origins of surface tension and disjoining pressure lie in nanoscale density gradients governed by molecular interactions. We shall see how the paradox of the moving contact line is resolved on the molecular scale when it is viewed as a physico-chemical problem dependent on fluid–substrate interactions.
There is enormous scale separation between molecular and hydrodynamic scales, which makes computation difficult but facilitates analytical theory. We ascend from molecular to macroscopic scales - from density functional theory to lubrication equations - by the approximation ladder. Multiscale perturbation theory elucidates dynamics of the contact line and provides tools for the study of various instabilities, as demonstrated taking as an example the motion of droplets driven by surface forces.

Available Formats

Format	Quality	Bitrate	Size
MPEG-4 Video	640x360	1.93 Mbits/sec	651.22 MB	View	Download
WebM	640x360	554.2 kbits/sec	182.39 MB	View	Download
iPod Video	480x270	521.92 kbits/sec	171.70 MB	View	Download
MP3	44100 Hz	249.78 kbits/sec	82.26 MB	Listen	Download
Auto *	(Allows browser to choose a format it supports)