水の沸騰について : 水平伝熱面における気ほうの発生

概要

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In order to investigate the mechanism of bubble formation in nuclear boiling, we have taken many photographs of bubbles on a horizontal heated plate by using the lens system and optical box of oscillograph, and at the same time we have measured by thermocouples the temperature of a heated flat plate and the temperature distribution from the surface of plate to the water level. The conclutions are shown as follows : (1) The type of bubbles are classified into four i.e. sphere type, bell type, couple type and tandem type. (The former two are simple bubbles and the latter two multiple bubbles) In case of distilled water, the rate of generating simple bubble decreases with increase of heat flux, and in case of city water, it is about 100% independent of heat flux. (2) The duration of adhesion of bubble to a surface is almost proportional to the cubic root of diameter of bubble leaving the heating surface.
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