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- W24619803 abstract "The use of Schlieren photography, interferometry and lasers are reviewed in the study of flow phenomena in magnetic fields. Schlieren photography depends on detecting changes in temperature or density from changes in the refractive index of the solution which can be photographed. This effect is enhanced by use of an equimolar solution of ferri-ferrocyanides in a magnetic field. By means of Schlieren methods it is possible to observe the change in thichness of a laminar layer in a magnetic field, to study the effect of magnetic field and flow rate on the characteristics of the laminar layer, and to investigate the laminarturbulent transition. By means of various modifications of the Schlieren method it is also possible to obtain distributions of temperatures, concentrations and flow rates. Interferometry methods are capable of more exact results, but are more difficult to use. This method can be separated into three groups: 1) slit and needle, 2) diffraction, and 3) polarization interferometers. These methods require monochromatic light sources of high brightness in one direction. Compensating cuvettes are used to equalize the difference in light paths between a standard and the unknown path of light. Various methods use the specific properties of lasers in studying MHD-flow:more » 1) laser interferometry, 2) holographic interferometry, 3) methods based on the use of the Doppler effect, and 4) methods based on the absorption, scattering and deflection of laser radiation on passage through various media. Laser radiation is readily focused; the equipment is easy to adjust; the radiation is intense. Measurements in a laminar layer 0.1 mm thick were carried out to an accuracy of 5% by the combined use of laser radiation and Schlieren photography. In holography the object is irradiated with coherent laser radiation, and the reflected light from the object and light from a standard source are sent to a film to give an interferometric pattern. Considerable information can be extracted from the hologram since the ampliiude and phase of the light wave are recorded. The Doppler method measures velocities over a considerable range from 10/sup -5/ to 10/sup 6/ m/sec with good time and spatial resolution (10/sup -11/ cm/sup 3/). These optical methods have many advantages over other methods. (67 references) (SJR)« less" @default.
- W24619803 created "2016-06-24" @default.
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- W24619803 date "1973-01-01" @default.
- W24619803 modified "2023-09-26" @default.
- W24619803 title "Use of optical methods in studying MHD processes" @default.
- W24619803 hasPublicationYear "1973" @default.
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