On Magnetic Field Control Experiments of Ferrofluid Convection Motion
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A.A. Bozhko
Summary
The experiments have been performed on the stability of buoyancy-driven flows of a ferrofluid for the cases of an inclined and vertical orientation of thin cylindrical encloser. Visualization of flow patterns is provided by a temperature-sensitive liquid crystal sheet which serves as the lower surface of a transparent heat exchanger. The local temperature sensor is used for measurement of heat transport across the fluid layer. The results indicate that with the help of an external homogeneous transversal magnetic field it is possible to control the stability of thermogravitational shear flow under vertical orientation of the layer, i.e. induce the thermomagnetic mode of instability with vertical orientation of longitudinal convection rolls. As numerous experimental investigations show the origin of concentration density gradients due to gravity sedimentation of magnetic particles and their aggregates results in traveling wave regimes of Rayleigh and thermomagnetic convection flows.
© by Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
- Magnetic Nanoparticles for Biomedical Heating Applications
- Characterization of the Grain Size in Ferromagnetic Colloids: Comparing Torsional-Pendulum Measurements with Standard Complementary Methods
- Structural and Magnetic Properties of Ni/NiOxide- and Co/CoOxide Core/Shell Nanoparticles and their possible Use for Ferrofluids
- Nanoscaled Nickel-Zinc-Iron Oxides of Spinell Type as Soft Magnetic Colloids and their Ferromagnetic Resonance Spectrum
- Gravity Level Influence on a Laterally Heated Ferrofluid Submitted to an Oblique Strong Magnetic Field
- Determination of the Thermo and Magneto Phoresis by the Dissipative Function
- Magnetization of Rotating Ferrofluids: Predictions of Different Theoretical Models
- Thermal Ratchet Effect in a Rotating Ferrofluid
- Distribution of Mitoxantrone after Magnetic Drug Targeting: Fluorescence Microscopic Investigations on VX2 Squamous Cell Carcinoma Cells
- Some Immobilization Modes of Biologically Active Substances to Fine Magnetic Particles
- On Magnetic Field Control Experiments of Ferrofluid Convection Motion
