Two-Phase Hartmann Flows in the MHD Generator Configuration.
Annual rept. Dec 75-Dec 76,
FLORIDA UNIV GAINESVILLE DEPT OF ENGINEERING SCIENCES
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Two-phase Hartmann flows in an MHD generator duct of rectangular cross-section are examined and numerical values for the velocity fields and induced current streamlines for fluids of spatially-dependent electrical conductivity are determined as a function of load factor, Hartmann number and channel aspect ratio. This study is of considerable practical interest in connection with some experimental work on two phase liquid metal-gas MHD generators and the results presented herein may enhance the understanding of the operating characteristics of such devices. Results indicate that conductivity gradients can produce inflected velocity profiles which may be hydrodynamically unstable, that for larger load factors the shunt current in the Hartmann boundary layers become considerable and that two-phase MHD flows of moderate void fractions have sound speeds considerably lower than in its components. Turbulent effects are not considered in these studies since turbulent fluctuations are expected to be suppressed for the high Hartmann number flows of interest in two-phase MHD generators.
- Fluid Mechanics
- Plasma Physics and Magnetohydrodynamics