Freezing phenomena of water droplets on metal surfaces widely exist in nature and industry. While the freezing of a sessile water droplet has been extensively studied, here we report an experimental and thoeritical investigation of the freezing characteristics of a deposited water droplet on cold hydrophilic and hydrophobic aluminum surfaces and also compare them with those of the sessile droplet. The results show that the deposited droplet starts to freeze from the liquid-solid interface after the spreading contact line is arrested by the cold surface and the recalescence stage observed during the freezing of a (supercooled) sessile water droplet does not appear. Furthermore, under our experimental conditions of surface temperature and wettability, the frozen shapes of the deposited droplets on the hydrophilic and hydrophobic surfaces are only dependent on the surface temperature while those of the sessile droplets unnoticeably change with the surface temperature but significantly vary with the surface wettability. Additionally, we present a scaling analysis to describe the temporal evolution of freezing front and the relationship between freezing time and surface temperature for the deposited droplet.

金属表面的水滴冻结现象在自然界和工业中广泛存在。虽然已经广泛研究了固着水滴的冻结，但在这里我们报告了对冷亲水和疏水铝表面上沉积水滴的冻结特性的实验和理论研究，并将它们与固着水滴的冷冻特性进行了比较。结果表明，在扩散接触线被冷表面阻止后，沉积的液滴开始从液-固界面冻结，并且在（过冷）固着水滴冻结期间观察到的再辉阶段没有出现。此外，在我们的表面温度和润湿性实验条件下，亲水和疏水表面沉积液滴的冻结形状仅取决于表面温度，而固着液滴的冻结形状随表面温度变化不明显，但随表面润湿性变化显着。此外，我们提出了一个比例分析来描述冻结前沿的时间演变以及冻结时间与沉积液滴的表面温度之间的关系。