Electrohydrodynamic method of determining the particle size of the dispersed phase in a magnetic fluid
| Autor: | Yu. D. Shikhmurzaev, A. A. Kubasov |
|---|---|
| Rok vydání: | 1988 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Condensed matter physics Mechanical Engineering General Physics and Astronomy Fluid mechanics equipment and supplies Phase (matter) Electric potential Electrohydrodynamics Current (fluid) Electric current human activities Electrical impedance Voltage |
| Zdroj: | Fluid Dynamics. 22:791-797 |
| ISSN: | 1573-8507 0015-4628 |
| DOI: | 10.1007/bf01051704 |
| Popis: | A mathematical model of the process of passing an alternating electric current through a magnetic fluid is proposed. The process has been experimentally investigated at different frequencies for various concentrations of the dispersed phase. So far this effect has been investigated mainly experimentally (for example, in [1, 2]), and the experimental results have been qualitatively interpreted. An expression is obtained for the impedance of the part of the circuit containing the cell with the magnetic fluid in the case of high frequencies. This expression makes it possible to determine, from the ratio of the amplitudes and phases of the current and the voltage in the circuit, the conducbivity and dielectric constant of the magnetic fluid. It is shown that in the particular case of low volume concentration of the dispersed phase the conductivity of the magnetic fluid depends on two parameters: the volume concentration of the dispersed phase a and the dimensionless frequency of variation of the potential difference applied to the cell containing the magnetic fluid Ω. The passage of an alternating electric current through a cell containing a magnetic fluid has been experimentally investigated at different frequencies for various volume concentrations of the dispersed phase. A new method of determining the particle size of the dispersed phase in a magnetic fluid is proposed on the basis of a comparison of the theoretical and experimental results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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