By Stefan Odenbach
Suspensions of magnetic nanoparticles or ferrofluids will be successfully managed by way of magnetic fields, which opens up a desirable box for uncomplicated learn into fluid dynamics in addition to a number of purposes in engineering and medication. The introductory bankruptcy offers the reader with simple info at the constitution, and magnetic and viscous homes of ferrofluids. the majority of this monograph is predicated at the author's personal study job and offers with ferrohydrodynamics, in particular with the magnetoviscous results. particularly, the writer experiences intimately the interparticle interactions to this point usually missed yet of significant significance in targeted ferrofluids. the fundamental thought and the latest experimental findings are awarded, making the ebook fascinating examining for physicists or engineers drawn to clever fabrics.
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9. Basic magnetic field geometries matching the symmetry of a Taylor-Couette system. 48 3. The magnetoviscous effect in highly diluted ferrofluids Fig. 10. , 1992). First of all an axial field Hz parallel to the cylinder axis can be applied. To obtain a homogenous field over the whole fluid gap, an arrangement of four coils on a spherical shell – a so called Fanselau arrangement (Fanselau, 1929) has been chosen. , 1992). The second possible field direction is an azimuthal magnetic field, which can be generated by a current leading wire along the cylinder axis.
1 Rotational viscosity 51 At this point one should mention, that the field-dependent viscosity changes obviously provide a tool for flow control in magnetic fluids, since flow components with vorticity perpendicular to the field direction will be suppressed. g. in (Schwab, 1989; Odenbach, 1995a) to align the flow of thermomagnetic convection in certain directions. Stepping back to Shliomis´ theory we should finally recognize, that it does not contain any shear dependence of the magnetoviscous effect.
Since the coil 28 2. Magnetic fluids has to move freely, no rigid connection is allowed and thus the heat transfer in conventional loud speakers is limited by the thermal conductivity of the air between coil and structure. Normal non-magnetic liquids can not be used to enhance the thermal conductivity in the speaker gap since they can not be reliably located in the gap. In contrast a magnetic fluid is spatially fixed by the strong field in the gap, holding the fluid in there, even if high amplitudes of the coil appear.