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Application of SLIPI-based techniques for droplet size, concentration, and liquid volume fraction mapping in sprays

Mishra, Yogeshwar Nath LU ; Tscharntke, Timo ; Kristensson, Elias LU and Berrocal, Edouard LU (2020) In Applied Sciences (Switzerland) 10(4).
Abstract

Structured laser illumination planar imaging (SLIPI)-based techniques have been employed during the past decade for addressing multiple light scattering issues in spray imaging. In this article, SLIPI droplet sizing based on the intensity ratio of laser-induced fluorescence (LIF) over Mie scattering (SLIPI-LIF/Mie) and SLIPI-Scan for extinction-coefficient (μe) mapping are applied simultaneously. In addition, phase Doppler anemometry (PDA) and numerical calculations based on the Lorenz-Mie theory are also employed in order to extract the droplets Sauter mean diameter (SMD), the droplets number density (N), and the liquid volume fraction (LVF) in a steady asymmetric hollow cone water spray. The SLIPI-LIF/Mie ratio is converted... (More)

Structured laser illumination planar imaging (SLIPI)-based techniques have been employed during the past decade for addressing multiple light scattering issues in spray imaging. In this article, SLIPI droplet sizing based on the intensity ratio of laser-induced fluorescence (LIF) over Mie scattering (SLIPI-LIF/Mie) and SLIPI-Scan for extinction-coefficient (μe) mapping are applied simultaneously. In addition, phase Doppler anemometry (PDA) and numerical calculations based on the Lorenz-Mie theory are also employed in order to extract the droplets Sauter mean diameter (SMD), the droplets number density (N), and the liquid volume fraction (LVF) in a steady asymmetric hollow cone water spray. The SLIPI-LIF/Mie ratio is converted to droplets SMD by means of a calibration procedure based on PDA measurements. The droplet SMD for the investigated spray varies from 20 μm to 60 μm, the N values range from 5 to 60 droplets per mm3, and the LVF varies between 0.05 x 10-4 and 5.5 x 10-4 within the probed region of the spray. To generate a series of two-dimensional images at different planes, the spray scanning procedure is operated in a "bread slicing" manner by moving the spray perpendicularly to the light sheet axis. From the resulting series of images, the procedure described here shows the possibility of obtaining three-dimensional reconstructions of each scalar quantity, allowing a more complete characterization of droplet clouds forming the spray region.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Laser-induced fluorescence (LIF), Liquid volume fraction (LVF), Mie scattering (Mie), Multiple scattering, Sauter mean diameter (SMD), Sprays, Structured laser illumination planar imaging (SLIPI)
in
Applied Sciences (Switzerland)
volume
10
issue
4
article number
1369
publisher
MDPI AG
external identifiers
  • scopus:85081206455
ISSN
2076-3417
DOI
10.3390/app10041369
language
English
LU publication?
yes
id
7e5d34f0-dd23-4c63-ad34-41408746769d
date added to LUP
2020-04-07 14:31:21
date last changed
2022-04-18 21:29:36
@article{7e5d34f0-dd23-4c63-ad34-41408746769d,
  abstract     = {{<p>Structured laser illumination planar imaging (SLIPI)-based techniques have been employed during the past decade for addressing multiple light scattering issues in spray imaging. In this article, SLIPI droplet sizing based on the intensity ratio of laser-induced fluorescence (LIF) over Mie scattering (SLIPI-LIF/Mie) and SLIPI-Scan for extinction-coefficient (μ<sup>e</sup>) mapping are applied simultaneously. In addition, phase Doppler anemometry (PDA) and numerical calculations based on the Lorenz-Mie theory are also employed in order to extract the droplets Sauter mean diameter (SMD), the droplets number density (N), and the liquid volume fraction (LVF) in a steady asymmetric hollow cone water spray. The SLIPI-LIF/Mie ratio is converted to droplets SMD by means of a calibration procedure based on PDA measurements. The droplet SMD for the investigated spray varies from 20 μm to 60 μm, the N values range from 5 to 60 droplets per mm<sup>3</sup>, and the LVF varies between 0.05 x 10<sup>-4</sup> and 5.5 x 10<sup>-4</sup> within the probed region of the spray. To generate a series of two-dimensional images at different planes, the spray scanning procedure is operated in a "bread slicing" manner by moving the spray perpendicularly to the light sheet axis. From the resulting series of images, the procedure described here shows the possibility of obtaining three-dimensional reconstructions of each scalar quantity, allowing a more complete characterization of droplet clouds forming the spray region.</p>}},
  author       = {{Mishra, Yogeshwar Nath and Tscharntke, Timo and Kristensson, Elias and Berrocal, Edouard}},
  issn         = {{2076-3417}},
  keywords     = {{Laser-induced fluorescence (LIF); Liquid volume fraction (LVF); Mie scattering (Mie); Multiple scattering; Sauter mean diameter (SMD); Sprays; Structured laser illumination planar imaging (SLIPI)}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{4}},
  publisher    = {{MDPI AG}},
  series       = {{Applied Sciences (Switzerland)}},
  title        = {{Application of SLIPI-based techniques for droplet size, concentration, and liquid volume fraction mapping in sprays}},
  url          = {{https://lup.lub.lu.se/search/files/85447500/applsci_10_01369_v2.pdf}},
  doi          = {{10.3390/app10041369}},
  volume       = {{10}},
  year         = {{2020}},
}