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Prediction and Measurement of the local extinction coefficient in sprays for 3D simulation/experiment data comparison

Grosshans, H.; Kristensson, Elias LU ; Szász, Robert-Zoltán LU and Berrocal, Edouard LU (2015) In International Journal of Multiphase Flow 72. p.218-232
Abstract
In the recent years, large progresses in laser imaging techniques have allowed to extract spatially resolved 2D and 3D quantitative spray information even in optically dense situations. The main breakthrough of these techniques is the possibility of suppressing unwanted effects from multiple light scattering using Structured Illumination. Thanks to this new feature, effects due to light extinction can also be corrected allowing the measurement of the local extinction coefficient. These quantitative information which is available even in challenging conditions, where Phase Doppler does not work anymore, can be used for data comparison between experiment and simulation. The local extinction coefficient is particularly valuable for the... (More)
In the recent years, large progresses in laser imaging techniques have allowed to extract spatially resolved 2D and 3D quantitative spray information even in optically dense situations. The main breakthrough of these techniques is the possibility of suppressing unwanted effects from multiple light scattering using Structured Illumination. Thanks to this new feature, effects due to light extinction can also be corrected allowing the measurement of the local extinction coefficient. These quantitative information which is available even in challenging conditions, where Phase Doppler does not work anymore, can be used for data comparison between experiment and simulation. The local extinction coefficient is particularly valuable for the description of the droplet field, defined as the "spray region", as it contains information related to both droplets size and concentration. In this article we detail, then, the procedure enabling the modelers to obtain numerically this local extinction coefficient over the full 3D spray system. Following this procedure, results can now be adequately compared between simulation and experiment. The proposed comparison approach can better guide model adjustments in situation where the initial droplet size distribution is unknown or approximated and presents a step towards future validations of spray simulations, especially those based on Lagrangian Particle Tracking. The approach is exemplified here for the case of a Diesel-type spray. The results reveal at which specific spray locations discrepancies occur, and highlight the sensitivity of the initial droplet size distribution on the resulting extinction coefficient. (C) 2015 The Authors. Published by Elsevier Ltd. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Atomizing sprays, Numerical simulation, Local light extinction, coefficient, Structured Illumination, Laser imaging
in
International Journal of Multiphase Flow
volume
72
pages
218 - 232
publisher
Elsevier
external identifiers
  • wos:000354584500020
  • scopus:84924739785
ISSN
0301-9322
DOI
10.1016/j.ijmultiphaseflow.2015.01.009
language
English
LU publication?
yes
id
69fb07f6-8877-4d95-a0dc-0900e4207464 (old id 7422802)
date added to LUP
2015-06-26 09:39:39
date last changed
2017-11-19 03:42:54
@article{69fb07f6-8877-4d95-a0dc-0900e4207464,
  abstract     = {In the recent years, large progresses in laser imaging techniques have allowed to extract spatially resolved 2D and 3D quantitative spray information even in optically dense situations. The main breakthrough of these techniques is the possibility of suppressing unwanted effects from multiple light scattering using Structured Illumination. Thanks to this new feature, effects due to light extinction can also be corrected allowing the measurement of the local extinction coefficient. These quantitative information which is available even in challenging conditions, where Phase Doppler does not work anymore, can be used for data comparison between experiment and simulation. The local extinction coefficient is particularly valuable for the description of the droplet field, defined as the "spray region", as it contains information related to both droplets size and concentration. In this article we detail, then, the procedure enabling the modelers to obtain numerically this local extinction coefficient over the full 3D spray system. Following this procedure, results can now be adequately compared between simulation and experiment. The proposed comparison approach can better guide model adjustments in situation where the initial droplet size distribution is unknown or approximated and presents a step towards future validations of spray simulations, especially those based on Lagrangian Particle Tracking. The approach is exemplified here for the case of a Diesel-type spray. The results reveal at which specific spray locations discrepancies occur, and highlight the sensitivity of the initial droplet size distribution on the resulting extinction coefficient. (C) 2015 The Authors. Published by Elsevier Ltd.},
  author       = {Grosshans, H. and Kristensson, Elias and Szász, Robert-Zoltán and Berrocal, Edouard},
  issn         = {0301-9322},
  keyword      = {Atomizing sprays,Numerical simulation,Local light extinction,coefficient,Structured Illumination,Laser imaging},
  language     = {eng},
  pages        = {218--232},
  publisher    = {Elsevier},
  series       = {International Journal of Multiphase Flow},
  title        = {Prediction and Measurement of the local extinction coefficient in sprays for 3D simulation/experiment data comparison},
  url          = {http://dx.doi.org/10.1016/j.ijmultiphaseflow.2015.01.009},
  volume       = {72},
  year         = {2015},
}