Abstract
In an extensive investigation of the thermal resistance of He II contained in both metal and glass capillary tubes, we have observed a curious and highly reproducible fine structure heretofore not reported. This fine structure, exhibited only in the metal tubes, can be satisfactorily accounted for by assuming the existence of two distinct distributions of vorticity, each described by the Vinen theory. The significant difference in the thermal resistance between glass and metal tubes has serious implications toward critical velocity measurements.
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