Abstract
The spreading of evaporating drops without a pinned contact line is studied experimentally and theoretically, measuring the radius$R(t)$of completely wetting alkane drops of different volatility on glass. Initially the drop spreads ($R$increases), then owing to evaporation reverses direction and recedes with an almost constant non-zero contact angle$\unicode[STIX]{x1D703}\propto \unicode[STIX]{x1D6FD}^{1/3}$, where$\unicode[STIX]{x1D6FD}$measures the rate of evaporation; eventually the drop vanishes at a finite-time singularity. Our theory, based on a first-principles hydrodynamic description, well reproduces the dynamics of$R$and the value of$\unicode[STIX]{x1D703}$during retraction.
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