HEAT-TRANSFER IN A BUBBLING LAYER AT PRESSURES ABOVE ATMOSPHERIC

An experimental investigation was conducted on the heat transfer durin g condensation of water vapor of average pressure on the surface of a horizontal rube located in a bubbling layer. The tests were done at pr essures of 0.15-0.8 MPa, volumetric vapor contents of 0-04-0.23, relat ive vapor velocities of 0.05-0.42 m/sec, liquid-wall temperature drops of 47-105 K, and thermal heat fluxes of 0.12-0.8 MW/m2. It was shown that the heat-transfer process in the bubbling layer is characterized by high intensity: for moderate vapor contents, the heat-transfer coef ficient reached 12-14 kW/(m2.K). It is concluded that the known calcul ated dependences do not consider the effect of pressure on the heat tr ansfer. The first radial distributions of the vapor content at pressur es above atmospheric were obtained by an electric-probe method.