Wetting behaviors of CO2 droplets on rough solid substrate
Understanding the role of rough solid substrates on the CO2 droplet's wetting characteristics is of importance for CO2 capture by dropwise condensation.The molecular dynamic method was adopted to investigate the effect of microstruc-tures,potential energy and temperature on the wetting behaviors of CO2 droplets.The results show that the contact angle of CO2 droplets is enhanced on the microstructured substrate in comparison with the smooth substrate.The wetting state of the CO2 droplets is affected by the potential energy parameters on the micro-structured substrate.On the solid surface with fence structures,the CO2 droplets change from the Cassie-Baxter state to the Wenzel state,while on the surface with the triangular and ramp structures CO2 droplets are always at the Wenzel state.With the increase of the potential energy parameters,all the corresponding contact angles of CO2 droplets on the three solid surfaces decrease.Moreover,as the temperature increases,the CO2 molecules overcome the interface energy barrier from the liquid phase to the gas phase,resulting in the decrease of the droplet size.The contact angle of droplets decreases very slightly with the increase of temperature.
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