Abstract
To study the water boiling phenomena under atmospheric pressure, a natural circulation loop with multiple rectangular channels was constructed for observing the behavior of steam bubbles and for measuring the distribution of voids in the heated sections by the gamma-ray attenuation method. The relative velocities of steamwater were evaluated from the results obtained. The precise effects of the channel width on the bubble size and the relative velocity of steam-water could not be obtained, but the general characteristics of boiling were observed. Upon comparing the results of the experiments with calculations based on the Behringer's and Johnson's data, slight deviations were found, especially when compared with the Behringer's data. It is concluded that the effect of the inlet velocity on the relative velocity must be taken into account, and that special attention is necessary in applying ihe Behringer's data to practical design, at least under atmospheric pressure.
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