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Mesures à haute résolution dans le temps de la cinétique d'évaporation des gouttelettes et de l'imagerie de cristallisation des particules

D. A. HARDY (1), J. S. WALKER (1), P. LEMAITRE (2), J. P. REID (1)

1. School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom
2. Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SCA, LPMA, Gif-sur-Yvette, 91192, France

[2021]

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Résumé

In this article, we study the influence of the drying kinetics of a droplet on the morphological characteristics of the particles produced, in order to model the aerodynamic properties of the aerosols thus formed.

 

We present the development of a new device allowing to analyze in detail the evaporation of droplets, from their production to the formation of a dry particle, including the nucleation of the first crystals. This experiment makes it possible to study the evaporation of the drops with a temporal resolution lower than a microsecond, and thus to detect very precisely, by image analysis, the start of crystallization. We present a first study carried out on an inorganic salt and which shows, depending on the drying conditions, a wide variety of particle morphologies.


Mots clés

atomisation, production de particules, évaporation, cinétique, chlorure de sodium, morphologie

Abstract

This article deals with the study of the relationship between factors governing droplet drying and resultant particle morphologies, with a specific interest in the aerodynamic properties of dried particles.

This work describes a new Falling Droplet Column (FDC), which offers the capability to analyze in detail the entire evaporative lifetime of individual droplets, from generation to dry particle formation, with capability for sub-microsecond temporal resolution and subsequent offline analysis of dried particles by SEM. A comparison of evaporative profiles and resulting morphologies produced in a range of conditions for different inorganic salts is presented. We will explore the specific crystallization events through detailed imaging of aerosol droplets.


Keywords

spray-drying, particle production, evaporation, kinetics, sodium chloride, morphology

DOI

10.25576/ASFERA-CFA2021-24842

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