Direct Numerical Simulations of the Evaporation of Dilute Sprays in Turbulent Swirling Jets

Pietro P. Ciottoli; F. Battista; R. Malpica Galassi; F. Dalla Barba; F. Picano

doi:10.1007/s10494-020-00200-7

Direct Numerical Simulations of the Evaporation of Dilute Sprays in Turbulent Swirling Jets

Pietro P. Ciottoli, F. Battista, R. Malpica Galassi, F. Dalla Barba, F. Picano

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16 Scopus citations

Abstract

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
DOIs	https://doi.org/10.1007/s10494-020-00200-7
State	Published - Aug 8 2020
Externally published	Yes

Bibliographical note

KAUST 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.

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10.1007/s10494-020-00200-7

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@article{b4d611a88d364afcb1dce534da7a2f8b,

title = "Direct Numerical Simulations of the Evaporation of Dilute Sprays in Turbulent Swirling Jets",

abstract = "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.",

author = "Ciottoli, {Pietro P.} and F. Battista and {Malpica Galassi}, R. and {Dalla Barba}, F. and F. Picano",

note = "KAUST Repository Item: Exported on 2021-02-16 Acknowledged KAUST grant number(s): OSR-2019-CCF-1975-35 Acknowledgements: Open access funding provided by Universit{\`a} 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.",

year = "2020",

month = aug,

day = "8",

doi = "10.1007/s10494-020-00200-7",

language = "English (US)",

journal = "Flow, Turbulence and Combustion",

issn = "1386-6184",

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T1 - Direct Numerical Simulations of the Evaporation of Dilute Sprays in Turbulent Swirling Jets

AU - Ciottoli, Pietro P.

AU - Battista, F.

AU - Malpica Galassi, R.

AU - Dalla Barba, F.

AU - Picano, F.

N1 - KAUST 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.

PY - 2020/8/8

Y1 - 2020/8/8

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10754/667420

UR - http://link.springer.com/10.1007/s10494-020-00200-7

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U2 - 10.1007/s10494-020-00200-7

DO - 10.1007/s10494-020-00200-7

M3 - Article

SN - 1386-6184

JO - Flow, Turbulence and Combustion

JF - Flow, Turbulence and Combustion

ER -

Direct Numerical Simulations of the Evaporation of Dilute Sprays in Turbulent Swirling Jets

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