Title

Sessile drops on nonhorizontal solid substrates

Document Type

Article

Date of Original Version

1-1-1987

Abstract

Experimental values of the maximum drop volume that can be sustained on an inclined solid surface are compared to the theoretical predictions by E. B. Dussan V. (J. Fluid Mech. 151, 1 (1985)). The agreement for both water and glycerol on Teflon substrates is within the measurement error. Thus, critical drop volumes can be predicted upon knowledge of the advancing and receding contact angles, the density and surface tension of the liquid, the gravitational acceleration, and the angle of inclination of the solid-all of which are system material properties or experimental conditions. Although the surface tension of glycerol is far less than that of water, it is held more firmly on the Teflon surface, showing that contact angle hysteresis has a key impact on when a drop will slide on the solid. The validity of the theoretical prediction can be exploited to accurately determine contact angle hysteresis for systems where the difference between the advancing and receding contact angles is small. © 1987.

Publication Title

Journal of Colloid And Interface Science

Volume

115

Issue

2

Share

COinS