A Multilayer Heat and Mass Transfer Model for Photoacoustics of Aerosol Particles (MHM-PA)
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Date
2023
Publication Type
Journal Article
ETH Bibliography
yes
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Abstract
A diffusion multi-layer model is introduced which allows time-dependent simulations of heat and mass transfer for photoacoustic experiments on aerosol particles (MHM-PA model). It provides spatial and temporal information on the particle temperature, composition and size during photoacoustic modulation cycles, and thus enables accurate simulations of the photoacoustic amplitude and phase at different modulation frequencies. Simulations for micrometer-sized, mixed water-tetraethylene glycol droplets at different relative humidity and at different modulation frequencies between 4 and 100 kHz reveal a substantial loss of the information content of the photoacoustic signal above ∼30 kHz. The photoacoustic amplitude reduces by two orders of magnitude, causing sensitivity issues. The photoacoustic phase converges to the same constant value for all droplet sizes and humidities, meaning that useful information on heat and mass transfer is essentially lost in the phase.
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published
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Journal / series
Volume
57 (8)
Pages / Article No.
742 - 757
Publisher
Taylor & Francis
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Edition / version
Methods
Software
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Date collected
Date created
Subject
Organisational unit
03961 - Signorell, Ruth / Signorell, Ruth
Notes
Funding
200306 - How weak intermolecular interactions govern the formation and properties of clusters and aerosol droplets (SNF)
Related publications and datasets
Is supplemented by: https://doi.org/10.3929/ethz-b-000577390