Numerical Modeling of Laser Heating and Evaporation of a Single Droplet

Pokharel, Sagar; Tropina, Albina; Shneider, Mikhail

doi:10.3390/en16010388

Numerical Modeling of Laser Heating and Evaporation of a Single Droplet

Journal Article · Wed Dec 28 23:00:00 EST 2022 · Energies

DOI:https://doi.org/10.3390/en16010388· OSTI ID:1907198

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Laser technology is being widely studied for controlled energy deposition for a range of applications, including flow control, ignition, combustion, and diagnostics. The absorption and scattering of laser radiation by liquid droplets in aerosols affects propagation of the laser beam in the atmosphere, while the ignition and combustion characteristics in combustion chambers are influenced by the evaporation rate of the sprayed fuel. In this work, we present a mathematical model built on OpenFOAM for laser heating and evaporation of a single droplet in the diffusion-dominated regime taking into account absorption of the laser radiation, evaporation process, and vapor flow dynamics. The developed solver is validated against available experimental and numerical data for heating and evaporation of ethanol and water droplets. The two main regimes—continuous and pulsed laser heating—are explored. For continuous laser heating, the peak temperature is higher for larger droplets. For pulsed laser heating, when the peak irradiance is close to transition to the boiling regime, the temporal dynamics of the droplet temperature does not depend on the droplet size. With the empirical normalization of time, the dynamics of the droplet shrinkage and cooling are found to be independent of droplet sizes and peak laser intensities.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; SC0022063

OSTI ID:: 1907198

Alternate ID(s):: OSTI ID: 2007654
OSTI ID: 1971461

Journal Information:: Energies, Journal Name: Energies Journal Issue: 1 Vol. 16; ISSN 1996-1073; ISSN ENERGA

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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