Method for measuring liquid-drop contact angle on solid surface and device thereof
A solid surface and measurement method technology, applied in the field of measurement, can solve the problems of not considering the influence of gravity, not considering the influence, and not being able to give the contact angle well, so as to improve the measurement accuracy and expand the measurement range.
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[0034] Examples:
[0035] Such as image 3 As shown, the specific implementation is divided into two parts: 1) establishing a database; 2) calculating the contact angle in real time. The specific operations for establishing a database are:
[0036] 1) Given the initial physical constants of the measured droplet: surface tension coefficient, density, volume. In the process of numerical solution, given initial boundary conditions (given contact angle θ, w 0 =0, the width r of any given adhesion zone 0 | w=0 And the pressure difference between the inside and outside of the droplet at the base ΔP 0 | w=0 ).
[0037] 2) Solve by shooting method (the formula of shooting method is r i | w=0 =r 0 +Δr, ΔP i | w=0 =ΔP 0 +ΔP);
[0038] 3) Determine whether the final boundary conditions are met (that is, the condition V=V for program termination 0 , dw dr | r 1 ...
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