Nano/micro-scale surface modifications using copper oxidation for enhancement of surface wetting and falling-film heat transfer

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...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2013-07, Vol.62, p.794-804
Main Authors: Köroğlu, Batikan, Lee, Kee Sung, Park, Chanwoo
Format: Article
Language:English
Subjects:
Chemical immersion
COMPOSITES
Contact angle
COPPER OXIDE
CUPRIC OXIDE
Evaporation
Falling-film evaporation
Heat transfer
MICROSTRUCTURES
Morphology
Nano and micro-scale surface morphology
Nanocomposites
Nanomaterials
Nanostructure
Oxidation
Surface wetting
Wetting
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Summary: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 angle90°) 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.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2013.03.040