ABSTRACT

We present experimental results on limiting vapor contents in the 2nd-kind crisis and on critical heat fluxes in the crisis of wetting in horizontal channels with a uniform heating around the perimeter. Experiments were conducted on round stainless steel tubes with d = 6 mm at P = 6.9; 9.8; 13.7 MPa, ρω = 750, 1000, 2000 kg/(m²·sec) and X = 0.25 ..., 1.0. The degree of nonuniformity is q_max/q = 1.5. The heat carrier is chemically desalinated water. It is shown that nonuniform heating around the perimeter favors an increase in q_cr of the 2nd kind and increase in the mean limiting vapor contents X_lim.