Abstract
Abstract The copper oxidation in NaOH aqueous solutions by a chemical immersion method was used to create nano/micro-scale surface morphology on heat transfer surfaces and control their liquid wettability. Different oxidation conditions, depending on nano/micro-scale surface morphologies, created hydrophilic surfaces (contact angle 90°) with nano/micro-crystal structures of Cu2O. A heat transfer experiment using a horizontal-tube, falling-film evaporator was performed to study the effect of the nano/micro-scale surface morphology of the evaporator tubes on surface wetting and heat transfer. The surface wetting and heat transfer performance of three different evaporators of plain (untreated), oxidized, and porous-layer coated tubes were compared.
Published Version
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