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?