ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
INFLUENCE OF NON−CONDENSABLE COMPONENT IN VAPOR-GAS MIXTURE ON THE INTENSITY OF LIQUID DROPLETS EVAPORATION
Sinopsis
The non−condensable component influence on the evaporation process intensity is considered in this work on
the example of water droplet evaporation placed into a vapor−gas medium. It should be noted that the removal
of vapor molecules from a droplet surface is an important stage of evaporation into a vapor−gas mixture. It is
often assumed that the heat supplied to an interface is entirely consumed for evaporation, while the formed
vapor is removed from the evaporation surface via diffusion. However the development of the diffusion flux
takes place at a distance of nearly mean free path of vapor molecules from the evaporation surface, i.e., in the
Knudsen layer. In this layer, due to intermolecular collisions, the molecule−velocity distribution undergoes
substantial changes, which are to be calculated by the methods of physical kinetics. In presented work the
system of two Boltzmann kinetic equations for vapor−gas mixture is used for calculation of mass flux density
evaporating substance in the near of evaporation surface. Vapor molecules are assumed to be removed from the
external boundary of the Knudsen layer due to diffusion. The results of the calculations have been compared
with the published experimental data.
PALABRAS CLAVE:
Boiling and evaporation, Two-phase/Multiphase flow, evaporation, non-condensable component