Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/29749
Title: Peculiarities of thermal and energy state variation in phase change regimes of water droplets in radiating biofuel flue gas flow
Authors: Miliauskas, G
Maziukienė, M
Poškas, R
Jouhara, H
Keywords: humid gas;water droplets;complex heating;phase change;combined analytical-numerical analysis
Issue Date: 31-Jul-2024
Publisher: Elsevier
Citation: Miliauskas, G. et al. (2024) 'Peculiarities of thermal and energy state variation in phase change regimes of water droplets in radiating biofuel flue gas flow', Energy, 307, 132620, pp. 1 - 17. doi: 10.1016/j.energy.2024.132620.
Abstract: A mathematical model is provided for the heat and mass transfer processes of a semi-transparent droplet. It evaluates the variation of liquid physical properties, when the droplet warms in a high temperature gas flow. A numerical investigation methodology, based on an iterative algorithm for instantaneous droplet surface temperature, is developed to determine the dynamics of the thermal and energy states of water droplets in phase change regimes. The condensation, transitional and equilibrium evaporation regimes have been modelled for droplets at a temperature of 40ºC, which is common in biofuel combustion technologies. Flue gases were considered as a hot and humid air flow in the 150ºC-1000ºC temperature range and a humidity of 0.4 according to the water vapour volumetric fraction, where droplets are slipping with an initial velocity of up to 60 m/s and their diameter is in the range of 50-1000 μm. In phase change regimes a detailed assessment is provided for heat and mass transfer parameters for droplets slipping in a radiating high temperature humid gas flow. It was confirmed that the thermal and energy state variations of water droplets in a flue gas flow are defined by the change of heat transfer regime, which is caused by the weakening of droplet slipping in the gas flow and radiation absorption weakening during their evaporation.
Description: Data availability: Data will be made available on request.
URI: https://bura.brunel.ac.uk/handle/2438/29749
DOI: https://doi.org/10.1016/j.energy.2024.132620
ISSN: 0360-5442
Other Identifiers: ORCiD: Hussam Jouhara https://orcid.org/0000-0002-6910-6116
132620
Appears in Collections:Dept of Mechanical and Aerospace Engineering Embargoed Research Papers
Institute of Energy Futures

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