Viscoelastic propulsion of a rotating dumbbell
arXiv:1912.02969 · doi:10.1007/s10404-019-2275-1
Abstract
Viscoelastic fluids impact the locomotion of swimming microorganisms and can be harnessed to devise new types of self-propelling devices. Here we report on experiments demonstrating the use of normal stress differences for propulsion. Rigid dumbbells are rotated by an external magnetic field along their axis of symmetry in a Boger fluid. When the dumbbell is asymmetric (snowman geometry), non-Newtonian normal stress differences lead to net propulsion in the direction of the smaller sphere. The use of a simple model allows to rationalise the experimental results and to predict the dependence of the snowman swimming speed on the size ratio between the two spheres.
References in corpus (21)
- Rheology of Active-Particle Suspensions
- Propulsion in a viscoelastic fluid
- Effective viscosity of microswimmer suspensions
- Running and tumbling with E. coli in polymeric solutions
- Undulatory swimming in viscoelastic fluids
- Flagellated bacterial motility in polymer solutions
- Self-propulsion in viscoelastic fluids: pushers vs. pullers
- Locomotion of helical bodies in viscoelastic fluids: enhanced swimming at large helical amplitudes
- Swimming speeds of filaments in nonlinearly viscoelastic fluids
- Enhanced low-Reynolds-number propulsion in heterogeneous viscous environments
- Flagellar Kinematics and Swimming of Algal Cells in Viscoelastic Fluids
- Fluid elasticity increases the locomotion of flexible swimmers
- Locomotion by tangential deformation in a polymeric fluid
- Enhanced active swimming in viscoelastic fluids
- Fluid Elasticity Can Enable Propulsion at Low Reynolds Number
- Flapping motion and force generation in a viscoelastic fluid
- Locomotion in complex fluids: Integral theorems
- Effective viscosity of non-gravitactic Chlamydomonas Reinhardtii microswimmer suspensions
- Undulatory swimming in fluids with polymer networks
- Pumping by flapping in a viscoelastic fluid
- Micropropulsion and microrheology in complex fluids via symmetry breaking