INVESTIGATION OF LIQUID METAL BOILING HEAT TRANSFER.
Final rept. May 63-Apr 66,
MICHIGAN UNIV ANN ARBOR LIQUID METALS LAB
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Nucleate boiling for sodium, rubidium, cesium, and water was studied. The critical heat fluxes were lower than hydrodynamic theory had predicted. Film boiling of potassium from a horizontal plate was studied. The flux level and the temperature difference between the surface and the fluid at the incipience of stable film boiling differed from earlier predictions. Agravic studies with pool boiling mercury were studied at accelerations up to 20 gs. Increases in pressure and acceleration usually improved the heat transfer. Sodium condensing studies resulted in coefficients of approximately 18,000 Btuhr sq ft. for fluxes up to 500,000 Btuhr sq ft. These are much lower than predictions from Nusselts theory. Two phase flow potassium pressure drop, void fraction and heat transfer studies were conducted. Pressure drop studies yielded lower results than predicted by Lockart - Martinelli procedures. The void fraction studies agreed with Baroczys predictions. The heat transfer studies were conducted at qualities up to 17. Author