Effect of Gravity on the Measurement of Contact Angle of Drop on a Solid Surface

Int. J. Microgravity Sci. Appl. 2007p267
Author
C. WANG, S. XU, Z. SUN and W. HU
Organization
National Microgravity Laboratory; Institute of Mechanics, Chinese Academy of Sciences
Abstract
In this study, a series of experiments were conducted, respectively, in the drop tower-which provides 3.5 seconds of microgravity and on the ground base (g=1) to test the effect of gravity on the contact angle of drops setting on the solid surface. The results show that the volume of the droplet has little influence on the measured contact angle in the microgravity condition. For small sized droplets, the measured contact angle on the ground is almost the same as in microgravity condition, while for large sized droplets, the measured contact angle on the ground is about 4° larger than the value of the microgravity.
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