ULTRA-HIGH CRITICAL HEAT FLUX (CHF)FOR SUBCOOLED WATER FLOW BOILING-I: CHF DATA AND PARAMETRIC EFFECTS FOR SMALL DIAMETER TUBES]

摘要

Ultra-high critical heat flux(CHF) data, with many values exceeding 100 MW~-2, were obtained using high mass velocity, subcooled water flow through short, small diameter tubes. These tests produced the highest CHF of 276 MW m~-2 reported in the literature for a uniformly heated tube which surpassed the prior record of 228 MW m~-2. The data include broad ranges of tube diameter (0.406-2.54mm),heated length-to-diameter ratio(2.4-34.1),mass velocity (5000-134000 kg m~-2s~-1),inlet temperature (18-70 deg C),and outlet pressure (2.5-172.4 bars). The parametric trends of CHF were ascertained relative to all important flow and geometrical parameters. CHF increased with increasing mass velocity, increasing subcooling, decreasing tube diameter, and decreasing heated length-to-diameter ratio.