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Showing 1 to 20 of 47 for “"Ferrofluid"”.
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Ferrofluid flow phenomena
An investigation of ferrofluid experiments and analysis is presented in three parts: a characterization of ferrofluid properties, a study of ferrofluid flow in tubing and channel systems, and a study of ferrofluid free surface sheet flows. The characterization of ferrofluid samples is completed …
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The Hydrodynamics of Ferrofluid Aggregates
Ferrofluids are comprised of subdomain particles of magnetite or iron oxide material that can become magnetized in the presence of a magnetic field. These unique liquids are being incorporated into many new applications due to the ability to control them at a distance using magnetic fields. …
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Weakly nonlinear surface waves in a ferrofluid
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1991.
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Organization of Paramagnetic and Nonmagnetic Colloidal Particles in Ferrofluid
… Three different colloidal systems immersed in ferrofluid with external time dependent magnetic field have been investigated. In each of them the effect of inter dipolar interactions on the particles is discussed. Three systems are arranged and discussed in three separate chapters. In chapter 3, …
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Ferrofluid flow and torque measurements in rotating magnetic fields
… purpose of this research is to provide data from ferrofluid flow and torque measurements in uniform and nonuniform rotating magnetic fields that can be compared to theoretical analyses in order to fully understand observed paradoxical ferrofluid behavior. In the presence of rotating magnetic …
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Ferrofluid flow & spin profiles for positive and negative effective viscosities
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Ferrofluid duct flow in alternating and travelling wave magnetic fields
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Characterizing ferrofluid spin-up flow in rotating uniform magnetic fields
A ferrofluid is a collection of nanoscale ferromagnetic particles with a stabilizing surfactant in a liquid to form a colloid. The dynamic behavior of ferrofluids in the presence of magnetic fields has long been an area of research interest. A particular area of interest deals with the "spin-up" …
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Ferrofluid surface and volume flows in uniform rotating magnetic fields
Ferrofluid surface and volume effects in uniform dc and rotating magnetic fields are studied. Theory and corroborating measurements are presented for meniscus shapes and resulting surface driven flows, spin-up flows, and Hele-Shaw cell flows and instabilities. To characterize the water-based and …
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Design and manufacture of a modular cylindrical apparatus for ferrofluid experimentation
Ferrofluids, colloidal suspensions of coated magnetic nanoparticles inside a carrier fluid, respond to externally applied magnetic fields. This thesis addresses the behavior of these fluids when subjected to an azimuthally rotating uniform magnetic field. In order to test the theory that fluid flow …
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Ferrofluid spin-up flows from uniform and non-uniform rotating magnetic fields
When ferrofluid in a cylindrical container is subjected to a rotating azimuthally directed magnetic field, the fluid "spins up" into an almost rigid-body rotation where ferrofluid nanoparticles have both a linear and an angular "spin" velocity. Flow observations are often limited to the ferrofluid …
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Effects of demagnetizing factors on transient motion of ferrofluid in a uniform rotating magnetic field
The mechanisms that lead to bulk flow within a ferrofluid-filled container subjected to a rotating uniform magnetic field are experimentally studied. There are two prevailing theories: spin diffusion theory and flow due to non-uniformities in magnetic field within the ferrofluid due to nonuniform …
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Ferrofluid dynamics in a Hele-Shaw cell simultaneously stressed by DC and rotating magnetic fields
… to the ferrohydrodynamic applications of ferrofluids in biomedicine. Careful measurements in Hele-Shaw cells with simultaneous perpendicular DC and in-plane rotating magnetic fields have shown that ferrofluid drop spiral patterns rotate in the same direction as the rotating magnetic field, …
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Magnetic fluid flow phenomena in DC and rotating magnetic fields
… of properties relating to the transition of a ferrofluid drop from a continuous phase into a discrete phase and also into a spiral flow, and a study of magnetic field induced ferrofluid flow reversals. The torque exerted on a spindle filled with magnetorheological fluid (MR fluid) and placed …
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Heat Transfer Enhancement using Iron Oxide Nanoparticles
… modeling indicate that the 15 nm particle ferrofluid enhanced heat capacity. The smaller particle ferrofluid also demonstrated up to a 39% improvement in heat transfer, while the larger particle ferrofluid degraded the heat transfer performance. Particles from the larger particle ferrofluid …
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Using a ferro-fluid pad to climb walls
… system that utilizes the viscosity property of ferrofluids. Ferrofluid viscosity is varies based on the magnetic field applied to it and this property enables ferrofluids to be used as an adhesive. This would allow a human, with a specially designed climbing gripper, to climb up walls by varying …
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Magnetic Manipulation and Assembly of Multi-component Particle Suspensions
… techniques were employed, the latter relying on ferrofluid, i.e. a suspension of magnetic nanoparticles in a nonmagnetic carrier fluid, which provides a strong magnetic permeability in the surrounding fluid in order to manipulate effectively non-magnetic materials. In each system it was found …
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Ferrohydrodynamic flows in uniform and non-uniform rotating magnetic fields
Ferrofluids are conventionally used in such DC magnetic field applications as rotary and exclusion seals, stepper motor dampers, and heat transfer fluids. Recent research demonstrates ferrofluid use in alternating and rotating magnetic fields for MEMS/NEMS application of microfluidic devices and …
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