  The prevailing models for advancing dynamic contact angle are under intensive
debates, and the fitting performances are far from satisfying in practice. The
present study proposes a model based on the recent understanding of the
multi-scale structure and the local friction at the contact line. The model has
unprecedented fitting performance for dynamic contact angle over wide spreading
speed regime across more than five orders of magnitude. The model also well
applies for non-monotonous angle variations which have long been considered as
abnormal. The model has three fitting parameters, and two of them are nearly
predictable at this stage. The one denoting the multi-scale ratio was nearly
constant and the one representing the primary frictional coefficient, has a
simple correlation with the liquid bulk viscosity.
