Observation of the Fingering of a Fluid Injected into a Viscous Non-Newtonian Fluid
Fluid Physics: Fluid and interface physics
7th ESA Student Parabolic Flight Campaign
A.C. Bon (1), N. Bonnet (1), M.A. Brudieux (1), B. Cardin (1), S. Antoine (1), P. Guiset (1), M. Krotov (1), M. Lemarenko (1)
A special category of fluids for which viscosity is not constant, the so-called non-newtonian fluids by opposition to newtonian fluids for which viscosity is constant, exhibit complex behaviors which haven´t been fully explored yet. The study of the patterns which arises from the interaction of these fluids is very likely to explain the formation of organs such as the kidneys.
The experiment is performed in microgravity so as to reproduce biological conditions. The injection of air into a non-newtonian fluid, namely a common hair gel, will be taped. The aim is to exhibit branching processes and, if successful, to find out the rules that drive them.
During the microgravity part, a constant speed syringe pump pushes air into a gel-filled cell. Two cameras record the injection and send the data to a hard disk which is to be read afterwards on the ground. The position of the cameras will allow us to build a stereoscopic view of the observation so as the enable a high quality description of the process. Thirty similar experiments, one for for each parabola, will be performed and will allow us to explore the range of the injection pressure around a.critical point where branching process should occur.
Olivier Minster (e-mail: email@example.com)