Frosting processes on hydrophilic surface

bare aluminum surface and hydrophobic surface were experimentally investigated. The condensate water droplets freezing

frost layer growth

defrosting and water drainage on different surfaces were studied. The experimental results show that the condensate water droplet shape is spherical segment on hydrophobic surface while irregular shape on hydrophilic surface and bare aluminum surface. The condensate water droplets freezing process is delayed and the height of frost layer grows slower on hydrophobic surface. Frosting process on different surfaces are tend to be the same

when the humid air temperature and cooling surface temperature are low enough. The frost distribution is even on hydrophilic surface and bare aluminum surface compared with the hydrophobic surface; the hydrophilic surface has less residual meltwater

thus frost mass is lower on hydrophilic surface in frosting/defrosting circulation.