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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

INFLUENCE OF NON−CONDENSABLE COMPONENT IN VAPOR-GAS MIXTURE ON THE INTENSITY OF LIQUID DROPLETS EVAPORATION

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.023474
pages 957-962

Resumo

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.