Experimental investigation of the critical heat flux in horizontal channels with circumferentially variable heating

摘要: Abstract The paper presents the outcome of tests on critical heat fluxes in horizontal round tubes with circumferentially uniform and variable heating. experiments were run small stainless steel 6 mm I.D. at pressures p=6.86; 9.81; 13.73 MPa, mass flow rates ρw=750, 1000, 2000 kg m−2s−1 steam qualities xcr=−0.5–0.7. degree nonuniformity circumferential flux distribution amounted to qmax/¯q. local values maximum flux, qcrmax, nonuniform heating are shown be somewhat higher than those qcr uniformly heated channels. Yet, averaged ¯qcr much lower region negative relative enthalpies acutally coincide case large positive qualities.