Investigation of Drag-Reduction Effect of Super-Hydrophilic Surface in Laminar Microchannel Flow

In previous studies of newly fabricated surface-coating materials, the super hydrophilic surface etched by Cu2+/HNO3 exerts higher drag-reduction effect at low Reynolds numbers than modified superhydrophobic even with similar structure. this paper, both experimental and modelling fluid dynamics are used to invest flow field for these surfaces in microchannel. The results showed that rate would gradually decrease velocity increment medium. Besides, dissolved gas does play a key role reducing shear stress near wall forming non-shear air/water interface increasing its wall-slippage effect. Moreover, flow-field stimulation analysis provides more intuitive schematic diagram magnitude pressure changes inside microchannel, roughness obtained chemical etching is capable enhance as well.