The effects of swirled inflows on the evaporation of dilute acetone droplets dispersed in turbulent jets are investigated by means of direct numerical simulation. The numerical framework is based on a hybrid Eulerian–Lagrangian approach and the point-droplet approximation. Phenomenological and statistical analyses of both phases are presented. An enhancement of the droplet vaporization rate with increasing swirl velocities is observed and discussed. The key physical drivers of this augmented evaporation, namely dry air entrainment and swirl-induced centrifugal forces acting on the droplets, are isolated with the aid of additional simulations in which the inertial properties of the droplets are neglected. The correlation between swirl and dry air entrainment rate is found to be responsible for the increase of the global evaporation rate and the spray penetration length reduction, while swirl-induced centrifugal forces are found to be effective only in the jet shear layer, close to the injection orifice, for the analyzed cases.
|Original language||English (US)|
|Journal||Flow, Turbulence and Combustion|
|State||Published - Aug 8 2020|
Bibliographical noteKAUST Repository Item: Exported on 2021-02-16
Acknowledged KAUST grant number(s): OSR-2019-CCF-1975-35
Acknowledgements: Open access funding provided by Università degli Studi di Roma La Sapienza within
the CRUI-CARE Agreement. This work is carried out with the support of the Italian Ministry of University
and Research (MIUR) and King Abdullah University of Science and Technology (KAUST). This study was
funded by KAUST OSR-2019-CCF-1975-35 Subaward Agreement.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.