Abstract
A composite surface formed by embedding high heat conductive elements in a base material is expected to enhance nucleate boiling. To fabricate several composite surfaces, small copper cylinders were embedded in a stainless steel disk of 30 mm diameter and 5 mm thick. The size and the number of them were varied from 4 mm to 1 mm and from one to seventy-seven, respectively. Saturated pool boiling experiments were performed by using distilled water at atmospheric pressure. It was confirmed that the surfaces of copper cylinders effectively functioned as nucleation sites and that boiling heat transfer coefficients on the composite surface were higher than on the plain wall of stainless steel. By a simple numerical analysis for heat conduction in the composite wall, the higher temperature and higher heat flux were substantiated on the copper cylinder surface.
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