FORCED-CONVECTION SUBCOOLED CRITICAL HEAT FLUX D20 AND H20 COOLANT WITH ALUMINUM AND STAINLESS STEEL HEATERS

摘要

Forced-convection critical heat flux data and correlations are presented for both heavy water (D20) and light water (H20) coolant. The data were obtained with stainless steel and alumi¬num heaters which formed the inner wall of an annular channel. The critical heat flux for D20 was determined to be 16% greater than that for H20 at the same coolant velocity and subcooling. The critical heat flux for aluminum heaters was determined to be at least 20% higher than that for stainless steel at the same coolant velocity and subcooling. A brief discussion of possible mechanisms for the difference is included. A combined improve¬ment of 40% in the burnout heat flux is shown for aluminum heat¬ers with D20 coolant over that for stainless steel heaters with H20 coolant. The results are for ideal heaters. When using the equations discussed in this report, factors must be applied for nonidealities such as the effect of spacer ribs.