FIG. 8 Dependence of the contact angle θ on the inflection angle α at given drop lengths L. FIG. 9 Dependence of the contact angle θ on the drop length L for given inflection angles α.

One more imaginable method based on the measurement of the inflection angle is to combine all three droplet characteristic parameters H, L, and α for determining the contact angle. Fig. 10a-c shows the relationship of the inflection angle in dependence of L/H-ratio by given contact angles in steps of 2°. Using L/H-ratio instead of absolute values of L or H replaces the need to determine the fiber radius rf. This is particularly advantageous because of the fact that the equations have to be transferred into their corresponding dimensionless forms by dividing all the used dimensional variables involved in the system by rf having a limited accuracy.