Effect of Superhydrophilic and Superhydrophobic Surfaces on Copper Based Heat Transfer Performance
The heat transfer and corrosion resistance of copper can be improved by super hydrophilic and superhydrophobic surfaces based on heat exchangers due to their special wetting properties.This article mainly studies the effect of superhydrophilic and superhydrophobic treatment on the corrosion resistance and heat transfer efficiency of copper based surfaces.The experimental investigation presents the superhydrophilic process conditions:electrodepositing for 30 minutes in a mixed solution of 1 mol/L NaOH and 0.5 mol/L NH4Cl at a current density of 2.0 mA/cm2,obtaining a copper hydroxide nanowire layer superhydrophilic film with an optimal hydrophilicity angle of 5°.The optimal process conditions for superhydrophobicity:electrodeposition of copper tetradecanoate superhydrophobic film with an optimal hydrophobic angle of 158°was obtained in 0.1 mol/L tetradecanoate ethanol solution at a voltage of 30 V for 60 minutes.The corrosion resistance of superhydrophilic superhydrophobic copper based surfaces is analyzed through Tafel curves,and the results show that superhydrophilic superhydrophobic copper surfaces have better corrosion resistance,with an increase of 3 and 1 order of magnitude,respectively.By using this method to treat copper based surfaces,it is found that the condensation water amount significantly increases,and the heat transfer efficiency increases by 38.3%.This strengthens the heat transfer on the copper based surface and enhances the heat transfer efficiency,making it suitable for surface treatment of copper based heat exchangers.
super hydrophilicsuper hydrophobicityheat exchangercorrosion resistanceheat exchange performance
万方数据
维普
