Heat flux density in the region of droplet contact line on a horizontal surface of a thin heated foil
V.V. Cheverda1, 2, A.L. Karchevsky2,3, I.V. Marchuk1,2, and O.A. Kabov1,4
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
3Sobolev Institute of Mathematics SB RAS, Novosibirsk, Russia
4Tomsk Polytechnic University, Tomsk, Russia
E-mail: slava.cheverda@gmail.com
Keywords: liquid droplet, local heating, wetting contact line
Pages: 803–806
Abstract
The evaporating water droplets on a horizontal heated substrate were experimentally studied. The constantan foil 25 μm thick with a size of 42x35 mm2 was used as a substrate. The
experiments were carried out with a single droplet or with an ensemble of two
or three droplets on the foil. The temperature of the lower surface of foil
was measured by an IR scanner. To determine the heat flux density at
evaporation of liquid near the contact line, the Cauchy problem for the
heat conduction equation was solved using the thermographic data. The results
of calculations showed that the maximal heat flux density takes place in the
region of the contact line and exceeds the average heat flux density from the
entire surface of foil. This is explained by the heat inflow from the foil
periphery to the droplet due to relatively high value of the coefficient
of heat conductivity of the foil material and high evaporation intensity in the
contact line region.
DOI: 10.1134/S086986431705016X
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