Abstract
The void fraction in a vertical upward two-phase flow of Na-Ar was measured using electro-magnetic flow meters and γ-ray attenuation. It was found that with a flow pattern of bubbly flow, the statistical error induced in measurements of void fraction was slightly greater when using γ-ray attenuation as compared to electro-magnetic flow meters, while with slug flow electro-magnetic flow meters method were quite incorrect.Measurements were also made on the heat transfer coefficient of Na-Ar twophase flow with uniform heat flux. The oddition of a small quqntity of the hiected Ar decreased the heat transfer coeffcient, but upon further increase of the gas content the coefficient increased after passing a minimum value.
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