Freezing on cold surfaces can cause equipment damage. To prevent the
increase of ice, it is necessary to understand the freezing process of
water droplets on the cold surface. This study based on the droplet
shape analyzer, the freezing process of droplets is studied visually.
The effects of the substrate temperature, ambient relative humidity, and
volume of droplets on the freezing process were analyzed. It is found
that the influence of ambient relative humidity and substrate
temperature on the supercooling time are related to the degree of
supercooling. When the substrate temperature is lower than the critical
supercooling degree, the effect of substrate temperature and the ambient
relative humidity on the supercooling time is weakened. With the
increase of volume, the supercooling time decreases first and then
increases. In the phase transformation stage, there is a positive
correlation between the change of phase transformation time and the
influencing factors.