Accurate Measurements and Simulations of the Evaporation and Trajectories of Individual Solution Droplets

Dan A Hardy, Joshua F Robinson, Tom Hilditch, Edward D Neal, Pascal Lemaitre, Jim S Walker, Jonathan P Reid*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)

Abstract

A refined numerical model for the evaporation and transport of droplets of binary solutions is introduced. Benchmarking is performed against other models found in the literature and experimental measurements of both electrodynamically trapped and freefalling droplets. The model presented represents the microphysical behavior of solutions droplets in the continuum and transition regimes, accounting for the unique hygroscopic behavior of different solutions, including the Fuchs–Sutugin and Cunningham slip correction factors, and accounting for the Kelvin effect. Simulations of pure water evaporation are experimentally validated for temperatures between 290 K and 298 K and between relative humidity values of approximately 0% and 85%. Measurements and simulations of the spatial trajectories and evaporative behavior of aqueous sodium chloride droplets are compared for relative humidity values between 0 and 40%. Simulations are shown to represent experimental data within experimental uncertainty in initial conditions. Calculations of a time-dependent Péclet number, including the temperature dependence of solute diffusion, are related to morphologies of sodium chloride particles dried at different rates. For sodium chloride solutions, dried particles are composed of collections of reproducibly shaped crystals, with higher evaporation rates resulting in higher numbers of crystals, which are smaller.
Original languageEnglish
Pages (from-to)3416–3430
Number of pages15
JournalThe Journal of Physical Chemistry B
Volume127
Issue number15
DOIs
Publication statusPublished - 7 Apr 2023

Bibliographical note

Funding Information:
D.A.H was supported by the Institut de Radioprotection et de Sûreté Nucléaire (S100100-101). J.F.R was supported by Alexander von Humboldt foundation. T.G.H and E.N. were supported by the Engineering and Physical Sciences Research Council Centre for Doctoral Training in Aerosol Science (S100146-103). J.S.W. was supported by the Engineering and Physical Sciences Research Council under grant code EP/N025245/1.

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.

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