Wrinkling instability of vesicles in steady linear flow
1 Department of Physics of Complex Systems, Weizmann Institute of Science - Rehovot, 76100 Israel
2 II. Institut für Theoretische Physik, Universität Stuttgart - 70550 Stuttgart, Germany
Received: 20 March 2014
Accepted: 24 June 2014
We present experimental observations and numerical simulations of a wrinkling instability that occurs at sufficiently high strain rates in the trembling regime of vesicle dynamics in steady linear flow. Spectral and statistical analysis of the data shows similarities and differences with the wrinkling instability observed earlier for vesicles in transient elongation flow. The critical relevance of thermal fluctuations for this phenomenon is revealed by a simple model using coupled Langevin equations that reproduces the experimental observations quite well.
PACS: 87.16.D- – Membranes, bilayers, and vesicles / 47.63.-b – Biological fluid dynamics / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion
© EPLA, 2014