Abstract
The results of experimental studies of water evaporation of sessile droplet on solid substrates with different thermal conductivities are presented. In experiments during droplet evaporation the temperature of its surface was determined using the infrared thermography method. The obtained results showed that interfacial temperature was higher than the adiabatic evaporation temperature for all substrates. As thermal conductivity of the substrate decreased, the droplet temperature decreased and the evaporation lifetime increased significantly. As a result it was established that the thermal conductivity of the material has a significant effect on the evaporation of droplets.
Highlights
Evaporation of sessile droplets on solid substrates has been widely discussed in the literature due to the wide occurrence of this physical phenomenon in a variety of practical applications including formation of nanostructures [1], inkjet printing [2], fuel burning [3] and bio analyses [4]
Interfacial temperature as function of time of water droplets sessile on the surfaces of different materials was obtained using the method of infrared thermography (Fig. 2)
After fast cooling by 2.5 0C, the temperature of water droplet on the teflon substrate gradually increased to ambient temperature
Summary
Evaporation of sessile droplets on solid substrates has been widely discussed in the literature due to the wide occurrence of this physical phenomenon in a variety of practical applications including formation of nanostructures [1], inkjet printing [2], fuel burning [3] and bio analyses [4]. The process of evaporation of sessile droplets is significantly affected by the substrate material. This task is a subject of many publications in the world. In recent work Lopes et al [9] used glass and silicon substrates with different conductivity and thermal diffusivity They found that the thermal properties of the substrate have a strong influence on evaporation lifetime of a sessile droplet. In most of these experimental works the changing of the droplet shape was investigated, and the droplet temperature was measured using contact methods. The use of these methods disturbs the integrity of the drop and induces errors in results
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