Figure 6
(a) Drop height z as a function of time for a typical small droplet: Rd = 24 μm and Vd = 8.30 m.s−1. The gray circles correspond to the experimental trajectory, the plain black curve corresponds to the trajectory obtained by solving numerically Eq. (1) (no evaporation, Rd constant) and the dashed red curve corresponds to the trajectory obtained by solving numerically Eqs (1) and (2) (with evaporation, Rd(t) non constant). The hatched gray and red zones represent the error in the numerical resolution of the respective models (1) and (1) & (2) induced by the experimental error on the initial drop size measurement: Rd = 24 ± 3 μm (experimental error on the initial velocity is negligible). (b) Drop height z as a function of time for a typical big drop: Rd = 307 μm and Vd = 1.16 m.s−1. In this case the experimental trajectory (gray circles) and the numerical trajectory with evaporation (dashed red) and without evaporation (plain black) all collapse. The dotted curve corresponds to the ballistic trajectory 
. (c) Drop radius variation rate (δRd(t)/Rd(0), with δRd(t) = Rd(0) − Rd(t)) for the drop corresponding to frame (a) (Rd(0) = 24 μm), on its time of flight. Here δRd(t)/Rd(0) reaches a final value of about 20% before landing again. (d) Drop radius variation rate for the drop corresponding to frame (b) (Rd(0) = 307 μm), on its time of flight. Here δRd(t)/Rd(0) reaches a final value less than 0.06% before landing again.
