Enhanced Pool Boiling on Copper-graphite Composite Surfaces

摘要

Nucleate boiling performances of a highly wetting liquid, Freon-113, and a moderately wetting liquid, water, on copper-graphite (Cu-Gr) composite surfaces are experimentally investigated. It is disclosed that the nucleate boiling heat transfer of both two kinds of liquids is augmented by the presence of graphite fibers, and the composite surface with 25% volume fraction of graphite fibers in the copper matrix is confirmed to exhibit the best enhancing performance. Stronger enhancement is obtained for water compared to Freon-113. A bubble departure model is suggested to explain the enhancement mechanism of the boiling heat transfer on the composite surfaces.