H112 STUDY ON THE CHARACTERISTICS OF COUNTER-CURRENT FLOW IN A VERTICAL PIPE(Liquid film flow)

概要

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Counter-current flow limitation (CCFL) is one of the most important phenomena in loss of coolant accident of nuclear reactors, because the CCFL restricts the amount of the falling water flow rate for core cooling. On the other hand, "Concept of minimum pressure energy consumption rate" was proposed to predict the characteristics of two-phase flow. In the present study, the CCFL experiment were performed with air-water in a vertical pipe in order to establish the simultaneous database of flow rates, differential pressure and liquid film thickness at CCFL. The wall and the interfacial friction factors were estimated from the database obtained. The calculations with the concept of the minimum pressure energy consumption rate were used to predict the characteristics of the CCFL in a pipe. The calculated results reasonably agreed with the experimental data. The result indicates that the concept is applicable for the prediction of CCFL in a pipe.
一般社団法人日本機械学会の論文
2000-10-01