EXPERIMENTAL TECHNIQUES IN ELECTROHYDRODYNAMICS.
Final technical rept. 1 Oct 68-31 Dec 69,
COLORADO STATE UNIV FORT COLLINS DEPT OF MECHANICAL ENGINEERING
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The critical Reynolds number for Hagen-Poiseuille flow was more accurately detected by means of the electric double layer technique. Results are obtained utilizing reversible microelectrodes mounted flush with the wall of the pipe in the region of fully developed Hagen-Poiseuille flow. Previous measurements depended on electrodes beyond the ends of the pipe, so that the effect of the entrance flow region of the pipe was included -- a source of error. Use was made of the microelectrodes to detect the streaming potential fluctuations and Fourier analysis of the fluctuation waveforms was carried ou the autocovariance function of each waveform and the Fourier transform spectral density of the autocovariance function were computed. A viscosimeter capable of handling small volumes of biological fluids such as blood was designed and construction is almost complete. The design is based on Stoke flow between two rotating coaxial, concentric cones. Author
- Plasma Physics and Magnetohydrodynamics