Abstract
Local heat transfer of an evaporating sessile droplet under a static electric field is an underdeveloped topic. In this research an 80 μl water droplet is placed in the centre of a 25 μm thick stainless steel substrate. A static electric field is applied by an electrode positioned 10 mm above the substrate. A high speed thermal imaging camera is placed below the substrate to capture the thermal footprint of the evaporating droplet. Four electric fields were characterised; 0, 5, 10 and 11 kV/cm. As the electric field is increased the contact angle was observed to decrease. The local heat flux profile, peak and radial location of this peek were observed to be independent of the applied electric field for all test points for this working fluid and surface combination.
Highlights
Heat and mass transfer to a sessile evaporating droplet has been an area of growing interest due to its increasing use in industrial applications and processes
Prior to testing the 80 μl deionised water droplet is placed in the centre of the stainless steel substrate
The experimental results show that the cooling profile, the peak convective heat flux, and the radial location of this peak are independent of the applied electric field for our results of an evaporating water droplet for the conditions of these particular experiments
Summary
Heat and mass transfer to a sessile evaporating droplet has been an area of growing interest due to its increasing use in industrial applications and processes. Previous research has primarily focused on heat transfer enhancement by investigating varied substrate structures and coatings and their impact on droplet wettability, the triple line and the average convective heat flux [1, 2, 3, 4, 5]. Droplet evaporation is governed by a number of different physical phenomena: heat transfer by convection, heat transfer induced by the substrate conduction, diffusion of the vapour around the droplet in the gaseous phase, and the molecular interactions between the droplet and the substrate that change the wettability of the evaporating droplet [6].
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