Difference between revisions of "Influence of Substrate Conductivity on Circulation Reversal in Evaporating Drops"

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(Summary)
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== Summary ==
 
== Summary ==
<math>k_{R}^{crit}=tan(\theta_{c})cot\left(\frac{\theta_c}{2}+\frac{\theta_c^2}{\pi}\right)</math>
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In this paper, Ristenpart ''et. al.'' study the flow patterns inside liquid drops on flat surfaces. Evaporation from the drops' surfaces leads to a thermal gradient and, thus, a gradient in surface tension. Displaying the [[Marangoni Effect| Marangoni effect]], fluid flows from regions with low surface tension to regions with high surface tension. The authors ask, within the drop, what direction is this Marangoni flow? Using both theoretical and experimental approaches the authors determine conditions which result in two different flow patterns.
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[[Image:Coordinates.png]]
 
[[Image:Coordinates.png]]
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Critical K
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<math>k_{R}^{crit}=tan(\theta_{c})cot\left(\frac{\theta_c}{2}+\frac{\theta_c^2}{\pi}\right)</math>
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Experiments
 
[[Image:FlowDirection.png]]
 
[[Image:FlowDirection.png]]
  
 
== Soft Matter Details ==
 
== Soft Matter Details ==

Revision as of 15:24, 15 November 2009

Overview

  • [1] Ristenpart, W., Kim, P., Domingues, C., Wan, J, & Stone, H. Physical Review Letters. 99, 234502-1 - 234502-4 (2007).
  • Keywords: Evaporation, Marangoni Effect, Contact Angle, Thermal Conduction, Surface Tension

Summary

In this paper, Ristenpart et. al. study the flow patterns inside liquid drops on flat surfaces. Evaporation from the drops' surfaces leads to a thermal gradient and, thus, a gradient in surface tension. Displaying the Marangoni effect, fluid flows from regions with low surface tension to regions with high surface tension. The authors ask, within the drop, what direction is this Marangoni flow? Using both theoretical and experimental approaches the authors determine conditions which result in two different flow patterns.

Coordinates.png

Critical K <math>k_{R}^{crit}=tan(\theta_{c})cot\left(\frac{\theta_c}{2}+\frac{\theta_c^2}{\pi}\right)</math>

Experiments FlowDirection.png

Soft Matter Details