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# Image analysis for time-resolved analysis of microparticle resuspension kinetics on a ventilated duct surface

Corentin Cazes, Lionel Fiabane, Félicie Theron, Laurence Le Coq, Dominique Heitz

► To cite this version:

Corentin Cazes, Lionel Fiabane, Félicie Theron, Laurence Le Coq, Dominique Heitz. Image analysis for time-resolved analysis of microparticle resuspension kinetics on a ventilated duct surface. 11th International Aerosol Conference (IAC), Sep 2022, Athens, Greece. hal-03863032

HAL Id: hal-03863032

https://hal.inrae.fr/hal-03863032

Submitted on 21 Nov 2022

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# Image analysis for time-resolved study of micro-particle resuspension kinetics on a ventilated duct surface

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## Authors

Corentin Cazes<fnref n="1" />,<fnref n="2" />

Lionel Fiabane<fnref n="2" />

Félicie Theron<fnref n="1" />

Dominique Heitz<fnref n="2" />

Laurence Le Coq<fnref n="1" />

Contact: corentin.cazes@imt-atlantique.fr

## References

* Crocker, J. C. and Grier, D. G. (1996) *Journal of Colloid and Interface Science*, 179(1):298-310

* Giering, S. L. C., Hosking, B., Briggs, N. and Iversen, M. H. (2020) *Front. Mar. Sci.* 7:564

* Theron, F., Debba, D. and Le Coq, L. (2020) *J. Aerosol Sci* 140, 105477

## Acknowledgments

This work is financially supported by the Ministry of Armed Forces - Defense Innovation Agency and the Région Pays de la Loire

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INNOVATION
DÉFENSE
LAB

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Région
PAYS DE LA LOIRE

## Context and objectives

### Analyse the temporal evolution of particle number and deposit properties

* **Monolayer deposit** of isolated bronze micro-particle

* **Glass surface** with nanometric roughness

* **Accelerated airflow** followed by a steady-state

## Methods

### Channel flow acquisition

* Open-loop ventilated duct

* **Optical method**: 2320 x 1728 pxl<fnref n="2" /> window, 30 Hz acquisition frequency, 0.86 mm/pxl resolution

* **Airflow properties** acquisition: hot wire and glue-on hot film probes

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## Image processing

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## Algorithm validation and results

* Identification of particle sizes preferentially resuspended

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* Remaining particle fraction evolution with airflow properties

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* Creation of synthetic images and numerical comparison between particle number and size distribution

<table><thead><tr><th rowspan="2">Sample n°</th><th>Particle number</th><th>Size distribution</th></tr><tr><th>Relative difference [%]</th><th>Bhattacharyya distance [%]</th></tr></thead><tbody><tr><td>1</td><td>2.6</td><td>0.36</td></tr><tr><td>2</td><td>2.9</td><td>0.39</td></tr><tr><td>3</td><td>3.1</td><td>0.27</td></tr><tr><td>4</td><td>4.0</td><td>0.33</td></tr></tbody></table>

* Study of cluster behaviour

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* Influence of the particle size

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<footnote n="1">¹IMT Atlantique, GEPEA</footnote>

<footnote n="2">²INRAE, OPAALE Unit</footnote>