Error message

Notice: Undefined offset: 0 in include() (line 35 of /home/it/www/www-icts/sites/all/themes/riley/templates/views/views-view-fields--related-file-field-collection-view.tpl.php).
Seminar
Speaker
Ranjini Bandyopadhayay (Raman Research Institute, Bengalure)
Date & Time
Thu, 01 April 2021, 15:00 to 16:30
Venue
Online seminar
Resources
Abstract

I shall describe some recent table-top experiments that we have performed in our laboratory. In the first experiment, millimeter-sized steel balls are dropped in aqueous clay suspensions. We observe that balls of larger diameters fail to achieve terminal velocity over the entire duration of the experiment. We propose a toy model that correctly predicts the time-dependence of the ball velocity for a range of ball sizes and clay concentrations. In another experiment, we record and analyze the interfacial fingering patterns that emerge when a Newtonian fluid displaces aqueous cornstarch suspensions in a radial Hele-Shaw cell. Increasing the viscosity of the displacing fluid and the concentration-dependent elasticity of the outer viscoelastic fluid both lead to significant suppression of interfacial instabilities. By performing a linear stability analysis of the interface, we predict a dominant wavelength of interfacial perturbation that closely matches with the spacing between fingers measured experimentally at the onset of instability.

Zoom link: https://zoom.us/j/92784092384?pwd=b3dDbUt6Y2M4ZmNPaVJ6aVBQbjArUT09
Meeting ID: 927 8409 2384
Passcode: 436959