Abstract
Change of geometrical characteristics of distilled water and aqueous ethanol solution droplets was studied under their evaporation on aluminum surface. According to change in the contact diameter three evaporation modes of distilled water droplet on polished aluminum surface were detected: increase in the contact area, pinning of a droplet (constant contact area), and droplet depinning (decrease in the contact diameter). During evaporation of aqueous ethanol solution droplets, two evaporation modes were detected: increase in the contact area, and droplet depinning.
Highlights
The last 20 years the interest for many practical applications has become heat and mass transfer processes in the mini- and microsystems
A droplet of a predetermined volume was placed on the surface by the electronic dispenser
An intensive evaporation of alcohol occurs on the border of the three phases, and under the action of the surface forces a droplet shrinks, the contact area reduces, and the contact angle increases
Summary
The last 20 years the interest for many practical applications has become heat and mass transfer processes in the mini- and microsystems. There is an intensive development of heat exchange systems with micro- and nanoscale It is known [12,13,14,15] that such systems are much more efficient than their analogs with typical dimensions of units and tens of millimeters. In recent years, thermosyphons and heat pipes with the transverse dimensions of 2 millimeters or less are applied for cooling microelectronic equipment [16,17]. Research in this area is being conducted primarily as a search for functional options (using such characteristics of search as refrigerants, materials, regime parameters, size, and configuration items) without analyzing the basic physics of processes occurring in such equipment [18]. Materials for mini heat exchange systems are non-ferrous metals, and the movement of coolant is implemented mainly in the form of rivulet currents, which can disintegrate into separate drops
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