Fully alternating, triaxial electric or magnetic fields offer new routes to fluid vorticity
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Noncontact methods of generating strong fluid vorticity are important to problems involving heat and mass transfer, fluid mixing, active wetting, and droplet transport. Furthermore, because zero or even negative shear viscosities can be induced, vorticity can greatly extend the control range of the smart fluids used in magnetorheological devices. In recent work we have shown that a particular class of ac/ac/dc triaxial fields (so-called symmetry-breaking rational fields) can create strong vorticity in magnetic particle suspensions and have presented a theory of the vorticity that is based on the symmetry of the 2-d Lissajous trajectories of the field and its converse. In this paper we demonstrate that there are three countably infinite sets of fully alternating ac/ac/ac triaxial fields whose frequencies form rational triads that have the symmetry required to drive fluid vorticity. The symmetry of the 3-d Lissajous trajectories of the field and its converse can be derived and from this the direction of the vorticity axis can be predicted, as can the dependence of the sign of the vorticity on the phase relations between the three field components. Experimental results are presented that validate the symmetry theory. These discoveries significantly broaden the class of triaxial fields that can be exploited to produce strong noncontact flow.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1235913
- Report Number(s):
- SAND-2015-20737J; SMOABF; 558184
- Journal Information:
- Soft Matter, Vol. 11, Issue 2; ISSN 1744-683X
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Critical nucleation mesh-size of coarsening transient colloidal networks
|
journal | January 2016 |
Tunable interactions between particles in conically rotating electric fields
|
journal | January 2018 |
| Topological protection of multiparticle dissipative transport | text | January 2016 |
Similar Records
Can symmetry transitions of complex fields enable 3-d control of fluid vorticity?
Quantifying vorticity in magnetic particle suspensions driven by symmetric and asymmetric multiaxial fields.