Berkeley Fluids Seminar
University of California, Berkeley
Bring your lunch and enjoy learning about fluids!
March 3, 2014
Dr. Lev Barash (Landau Institute for Theoretical Physics)
Dependence of fluid flows in an evaporating sessile droplet on the characteristics of the substrate
Temperature distributions and the corresponding vortex structures in an evaporating sessile droplet are obtained by performing detailed numerical calculations. A Marangoni convection induced by thermal conduction processes in the drop and the substrate is demonstrated to be able to result not only in a single vortex, but also in two or three vortices, depending on the ratio of substrate to fluid thermal conductivities, on the substrate thickness and the contact angle. The "phase diagrams" containing information on the number, orientation and spatial location of the vortices for quasistationary fluid flows are presented and analysed. The results obtained demonstrate that the fluid flow structure in evaporating droplets can be influenced in a controlled manner by selecting substrates with appropriate properties.
Acknowledgments
Prof. Graham Fleming (Vice Chancellor for Research, UC Berkeley)
Prof. Eliot Quataert on behalf of The Theoretical Astrophysics Center and the Astronomy Department (UC Berkeley)
Prof. Philip S. Marcus on behalf of the Mechanical Engineering Department (UC Berkeley)
Prof. Michael Manga (Earth and Planetary Science, UC Berkeley)
Prof. Evan Variano (Civil and Environmental Engineering, UC Berkeley)