THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Sergey Ya Misyura

,

V. S. Morozov

DROPLET EVAPORATION ON A HEATED STRUCTURED WALL

ABSTRACT
Evaporation of water droplets on a structured surface is studied experimentally. With an increase in the wall temperature Tw from 28 to 70 °С the exponent n increases from 1 to 1.37 in the evaporation law (j = dm/dt ~ R0n, where m is the droplet mass and R0 is the droplet radius). Usually, researchers simulating droplet evaporation consider a linear relationship between the evaporation rate j and the droplet radius R0 (n = 1). This paper shows an increase of the exponent n with a growth of the wall temperature Tw. The diffusion vapor layer on the droplet interface and the boundary air layer on the surface of the heated cylinder with a diameter exceeding the droplet’s one are formed. A neglect of free convection more than 5 times underestimates calculation results compared with experimental data. At droplet evaporation it is necessary to take into account convection in a vapor-gas medium and wall roughness.
KEYWORDS
natural convection, structured surface, droplet evaporation
PAPER SUBMITTED: 2018-05-02
PAPER REVISED: 2018-05-20
PAPER ACCEPTED: 2018-05-20
PUBLISHED ONLINE: 2018-05-13
DOI REFERENCE: https://doi.org/10.2298/TSCI180502147M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 2, PAGES [673 - 681]
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Droplet evaporation on a heated structured wall

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