FERROFLUID PUMPBy Caleb Piercy
What is Ferrofluid? A colloidal suspension of magnetic nano-
sized particles that undergo continuous Brownian motion and thus never settle out.
Commonly made from magnetite.
Potential Applications
Magnetic Susceptibility Static Magnetic Fields
Viscosity increases with applied field H.
Alternating Magnetic FieldsViscosity varies with field strength & frequency.
Langevin Dynamics
Resonance Resonance occurs when processes in
synchronization with the frequency of the rotating magnetic field .
The Spin-Up Effect
So How Do You Pump It? Prototype by Her Koser – UGA
My Concept
Convert the spin up effect into linear flow with helical fins.
Problems
Unknown Influence of Helical Fins Control System
AC StatorHigh Frequency Signal GeneratorVoltage Amplifier
Internal Pressure @ GHz frequencies.
References "Negative-Viscosity" Effect in a Magnetic Fluid (Sept. 1995) - J.C. Bacri, R. Perzynski Modeling a Ferrofluid in a Rotating Magnetic Field (2007) - Bruce A. Finlayson Brownian relaxation of Magnetic Colloids (Nov. 2004) - B. Fischer, B. Huke, M. Lucke,
R. Hempelmann Emergent Viscous Phenomena in Ferrofluids (Dec. 2008) - Michael Murray On Measurement of the Resonant Properties of Magnetic Colloidal Suspensions
(June 2008) - Peter Nash, Paul Fannin Van der Waals Versus Dipolar Forces Controlling Mesoscopic Organizations of
Magnetic Nanocrystals (Dec. 2003) - Y. Lalatonne, J. Richardi, M. P. Pileni Ferrofluid Meniscus in a Horizontal or Vertical Magnetic Field (2005) - R.E.
Rosensweig, S. Elborai, S. H. Lee, M. Zahn Torque Measurements in Spin-Up Flow of Ferrofluids (March 2004) - Adam D.
Rosenthal, Carlos Rinaldi, Thomas Franklin, Markus Zahn Negative Viscosity of Ferrofluid Under Alternating Magnetic Field (April 1994) - Mark I.
Shliomis, Konstantin I. Morozov Ferrofluids: Properties and Applications (Sept. 2005) - C. Scherer, A.M. Figueiredo
Neto Experiments on Negative and Positive Magnetoviscosity in an Alternating Magnetic
Field (Nov. 1998) - A. Zeuner, R. Richter, I. Rehberg Thermal and Dynamic effects in Langevin Simulation of Hysteresis in Nanoscale
Pilars. (2001) - Gregory Brown, M.A. Novotny, P.A. Rikvold
QUESTIONS?