Research / 2020 / Article / Fig 3

Research Article

The Possibility of Changing the Wettability of Material Surface by Adjusting Gravity

Figure 3

Hydrostatic pressure at different gravities. (a) Sessile water drop on DMDCS at different gravities (). At higher gravity, the drop deforms and its height decreases more obviously. (b) Height versus the three-phase contact radius for sessile water drops on DMDCS surface under 1-8 G gravity. (c) Hydrostatic pressure at the three-phase contact line versus the three-phase contact radius for sessile water drops on a DMDCS surface under 1-8 G gravity. (d) Hydrostatic pressure at the three-phase contact line versus the different gravities. (e) Conventional analysis of the equilibrium of forces near the three-phase contact line (gravity is not considered). (f) Equilibrium of forces near the three-phase contact line of a sessile drop (gravity is considered). The experimental measurement shows that although the height decreases, the hydrostatic pressure increases monotonously with gravity, indicating that hydrostatic pressure should not be neglected, especially when gravity is large. The qualitative analysis in (f) shows that gravity can decrease the contact angle.