The phenomenon of tumbling of microscopic objects is commonly associated with shear flows. We address the question of whether tumbling can also occur in stretching-dominated flows. To answer this, we study the dynamics of a semi-flexible trumbbell in a planar extensional velocity field. We show that the trumbbell undergoes a random tumbling-through-folding motion. The probability distribution of long tumbling times is exponential with a time scale exponentially increasing with the Weissenberg number.
Electronic supplementary material is available online at http://dx.doi.org/10.6084/m9.figshare.c.3473661.
- Received March 30, 2016.
- Accepted September 5, 2016.
- © 2016 The Author(s)
Published by the Royal Society. All rights reserved.