Boiling crisis data for vertical upflow of freon-12 in round tubes and annular channels

Abstract

Results from boiling crisis (burnout) tests including associated pressure drop data are reported for vertical upflow of Freon-12 at a nominal inlet pressure of 1.0 MPa in three round tube test sections (15 to 21 mm internal diameter heated lengths 2.85 to 3.94 m) and four annular test sections of identical cross section dimensions (16 mm diameter inner tube and 21 mm diameter shroud) with different heated lengths. The tests covered a range of values for coolant flowrate and inlet subcooling.