Experimental Two-Phase Liquid-Metal Magnetohydrodynamic Generator Program.
Annual rept. Oct 76-Sep 77,
ARGONNE NATIONAL LAB ILL ENGINEERING DIV
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Testing of the second diverging-channel generator with the revised ambient-temperature NaK-N2 facility has been completed. The primary goal of the revised facility, demonstrating reduced slip ratio ratio of gas velocity to liquid velocity with higher liquid velocity flow rate, was accomplished. The reduction in slip ratio was dramatically demonstrated by a series of consecutive runs with varying flow rate from 6 kgs to 12 kgs for the liquid. Substantial increases in generator efficiency were obtained with higher liquid flow rates. Experiments to demonstrate that good liquid-to-gas heat transfer exists in the generator were successfully completed. Good heat transfer is essential because it is the almost constant temperature expansion of the gas vapor in the generator that yields higher system efficiencies for liquid-metal MHD power cycles. The feasibility of generating relatively-stable bubbles, hence, a foam, in liquid metals has been demonstrated. Photographic documentation of these phenomena, both motion and still pictures, was made. Surface tension measurements and foaming experiments have shown that viscosity is also a factor in promoting bubble formation and persistence. Wetting and contact angle measurements have been made for stainless steel and carbon steel immersed in eutectic NaK.
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