Two-phase pressure drop and wall-temperature measurements at steady state in the high-pressure, nucleate and film-boiling regimes

Measurements of critical heat flux, post-dryout pressure drops and wall temperatures have been obtained using two circular tubes of different inside diameters. The test sections were constructed with Inconel-600 tubes and electrically heated with direct current. They were positioned vertically and cooled with an upward flow of light water. Six pressure taps and 15 thermocouples were installed along various axial locations. The tests covered pressures of 5000, 7000 and 9600 kPa, mass flux of 1000 to 10000 kg.m-2.s-1, and inlet quality of -20 to -1%. This paper presents some observations and preliminary results obtained from the experiment. (Author) 3 refs., 5 figs., tab