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Principles of Video Contact Angle Analysis, Medicine, Page 7

Principles of Video Contact Angle Analysis

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Simple Theoretical Model

Assume the drop is part of a sphere
b 


r

 r-b 
 - tan-1 
90 


 2rb-b 
2




• Contact angle analysis software in general assume the drop is part of a
sphere.
• However, due to gravitation and molecular dispersion, the shape of a drop is
close but not exactly a part of a sphere.
• The hidden assumption: when the drop volume is small, the gravitational
effect can be ignored.
• Improved on sphere model has been replaced by ellipsoid model to simulate
gravitational effect. But, what about the molecular dispersion?

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