Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
658263 | International Journal of Heat and Mass Transfer | 2013 | 11 Pages |
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-whisker structures of CuO, and hydrophobic 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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Batikan KöroÄlu, Kee Sung Lee, Chanwoo Park,