The hydrodynamics of air-liquid compound droplet impact on the super-hydrophobic surface was experimentally studied.We investigated the critical conditions of cavity rupture,the maximum spreading coefficient,and the temporal evolution of the spreading coefficient during impact.The difference between the compound and single-phase droplet impact was analyzed.The experimental results show that the criti-cal threshold of cavity rupture increases with the increase of liquid viscosity and the decrease of air-liquid diameter ratio.The maximum spreading coefficient of compound droplets decreases with the increase of both liquid viscosity and cavity size.We derived the theoretical formula for the critical condition of cavity rupture,and the theoretical model of maximum spreading coefficient for the air-liquid compound droplet impact.In addition,we also studied the contact time of compound droplets after impact,which is smaller than that of the single-phase droplet under three kinds of air-liquid diameter ratio.A theoretical formula of dimensionless contact time with diameter ratio is proposed.
air-liquid compound dropletsuper-hydrophobic surfacespreading coefficientcontact time
维普
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