Oscillation Frequencies at Condensation Oscillation during Steam Condensation in Subcooled Water (Comparison of Linear Solution with Published Correlations and Experimental Data)

• Published in: JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties Vol. 31; no. 3; pp. 461 - 468
• Main Authors: AYA, Izuo, NARIAI, Hideki
• Format: Journal Article
• Language: English
• Published: The Japan Society of Mechanical Engineers 1988
• Subjects: Boiling Water Reactor; Condensation Oscillation; Linear Analysis; Nuclear Engineering; Oscillation Frequency; Phase Change; Suppression-Type Containment
• ISSN: 0914-8817
• DOI: 10.1299/jsmeb1988.31.3_461

A Linear solution of oscillation frequencies at condensation oscillation, which occurs when steam is fed into subcooled pool water at a steam mass flux between 30∼120 kg/(m2·s), was compared with published empirical correlations as well as approximate solutions. At atmospheric conditions, these solutions and correlations are almost consistent with each other and correspond well to data obtained in small-scale experiments. At the condition of loss of coolant accident of a real BWR suppressiontype containment (higher pressure and larger vent tube diameter), the linear solution can explain the tendency of the data obtained by large-scale test rigs. However, the correlations are not always adequate for such higher-pressure applications, because they are based on data at atmospheric pressure. It was also clarified that the condensation heat-transfer coefficient, adequate data of which is not available for higher pressures, considerably influences the solutions.