EFFECT OF CHANNEL BLOCKAGE ON CRITICAL HEAT-FLUX FOR A HORIZONTAL CYLINDER IN CROSS-FLOW

An experimental investigation has been conducted on critical heat flux (CHF) on a horizontal tube in crossflow boiling R-113 at near atmosph eric pressures. Data were obtained over a range of fluid velocities (u p to 0.52 m/s), heater diameters (8 to 12.7 mm), and flow blockage fac tors (D/H = 0.31 to 0.5). The effect of the flow blockage on CHF was e xamined in detail and compared with other data and existing correlatio ns. No significant effect of flow blockage was observed for D/H Icp to 0.5, An analytical modification of the Katto-Haramura CHF correlation is proposed to take into account the effect of flow blockage over a w ide range of D/H.