In previous researchers' studies

the evaporation of droplets were conducted on heating surfaces with constant wall temperature. However

no previous experiments were carried out on a constant heat flux heating surface. The evaporation of 3 μl sessile droplets on hydrophilic and hydrophobic heating surface with constant heat fluxes were observed and recorded by a high-speed photography. The evaporation time

dimensionless contact angle

dimensionless contact diameter and height were presented. The evaporation rate of the droplet on the hydrophilic surface was faster than that on the hydrophobic surface

and with the increase of the heat fluxes

the evaporation rate of the droplet increases. For both hydrophilic and hydrophobic surface

the evaporation mainly followed the CCR mode

and there was a mixed evaporation mode at the later stage of evaporation

but no CCA mode was found in the whole process.