Zhi Chen

The Relationship between Substrate Roughness and Wettability of Superhydrophobic Metal Carboxylate Surface

This letter introduces the properties of superhydrophobic metal carboxylate surface. The relationship between wettability of superhydrophobic metal carboxylate and substrate roughness has been studied by choosing sandpaper with roughness range from 80 to 2000 grit as substrates. The superhydrophobic effect has been found interrelated to substrate roughness. This phenomenon has been analyzed both experimentally and theoretically. This work has guidance significance to control the wettability in industrial production.

Simulation of Facet Dendritic Shape of Isothermal Alloy in a Forced Flow by Phase Field Method

Numerical simulation based on a new regularized phase field model was performed to describe the dendritic growth of an isothermal alloy with a strong anisotropy in the presence of a forced flow. These results indicate that a crystal grow into an equiaxial facet dendritic in the absence of a forced flow and into an asymmetrical facet dendritic in the presence of a forced flow. With increasing a flow velocity, the tip steady velocity of upstream dendritic arm increases, that of the downstream arm decreases, and that of the perpendicular arms increases at first, and then decreases, the perpendicular arms gradually grow toward the incoming flow direction. In the certain range of anisotropy parameter, when γ is larger than 0.14, dendritic tip steady velocities in all direction are expected to reach their own saturation values. In addition, the effect of a compound forced flow on an isothermal facet dendritic is similar to experimental results.