Abstract
The nuclei of vapour bubbles in pool boiling are usually assumed to be spheres of radius R n , the value of which depends upon the superheat of liquid. It is shown in this paper that the vapour nucleus is a sphere only in the case of uniform superheat. If there is a temperature gradient the shape of the active bubble nucleus is flattened. As a consequence the liquid superheat at the wall needed for activation is greater than in the case of uniform superheat.
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