Mixing stuff in very viscous fluids, or better said: at low Reynolds number, is not easy. Here is a microfluidics tool that allows one to do so anyway. It uses a simple small magnet aka stirring bar in a small chamber. M.J. Workamp, V. Saggiomo, J.A. Dijksman — Journal of Micromechanics and Microengineering 25 (2015)Continue reading “A simple low pressure drop suspension-based microfluidic mixer”
Author Archives: joshuadijksman
Gelatine photoelastic hydrogel particles!
Measuring hydrogel friction
Resolving the rub in lubricated soft solid friction…
Uncovering temporal transitions and self-organization during slow aging of dense granular media in the absence of shear bands
David M. Walker, Antoinette Tordesillas, Jie Ren, Joshua A. Dijksman, Robert P. Behringer — EPL 107 (2014) 10.1209/0295-5075/107/18005
Statistical properties of granular materials near jamming
R.P. Behringer, D. Bi, B. Chakraborty, A. Clark, J. Dijksman, J. Ren, J. Zhang — Journal of Statistical Mechanics: Theory and Experiment 2014 (2014) 10.1088/1742-5468/2014/06/P06004
Visiting the pantheon of granular physics
It doesn’t look like much, but here is where the particle Gods live. Visiting IUSTI Marseille.
Stratasys Objet 30 printer working
+++ recommended
Rheology of weakly vibrated granular media
Geert H. Wortel, Joshua A. Dijksman, Martin Van Hecke — Physical Review E – Statistical, Nonlinear, and Soft Matter Physics 89 (2014) 10.1103/PhysRevE.89.012202
Shear jamming in granular experiments without basal friction
H. Zheng, J.A. Dijksman, R.P. Behringer — Europhysics Letters 107 (2014) 10.1209/0295-5075/107/34005
Classics
POV-Ray on experimental data of diffusion in granular flows never ceases to amaze. This video shows reconstructed laser-sheet imaging data from a so-called split-bottom shear experiment. The color indicates the angular velocity of the particles.
