Abstract
The use of laser irradiation to remove contaminants from soil is an emerging soil remediation technology with broad application prospects. The mechanisms of temperature field variations, moisture transport, evaporation, and condensation under conditions with or without a carrier gas during laser soil remediation are still unclear. This paper utilizes a heat and mass transfer model under continuous wave (CW) laser irradiation, established based on local non-thermal equilibrium, to analyze the variation characteristics of the physical field within the soil, with or without introducing a carrier gas. The results show that CW laser irradiation can rapidly heat the soil to the expected remediation temperature (90 °C–560 °C). However, the gas transport speed induced solely by CW laser irradiation within the soil is very limited (on the order of 0.01 mm/s), making it ineffective at removing vapor from the soil. In contrast, using a carrier gas significantly improves gas flow (on the order of 10 mm/s), enhancing both heat and mass transfer processes and assisting in removing contaminants during laser soil remediation. This study elucidates the coupled heat and moisture transfer process in unsaturated porous media under conditions with and without a carrier gas, providing theoretical support for applying laser soil remediation.
Acknowledgments
We thank the Key Laboratory of Jilin Province Solid-State Laser Technology and Application for the use of the equipment.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: The raw data can be obtained on request from the corresponding author.
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© 2024 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Research Articles
- Modeling high-pressure viscosities of fatty acid esters and biodiesel fuels based on modified rough hard-sphere-chain model and deep learning method
- Study on heat and mass transfer mechanism of unsaturated porous media under CW laser irradiation: with and without carrier gas
- Efficient ecological function optimization for endoreversible Carnot heat pumps
- Entropy as Noether charge for quasistatic gradient flow
- Numerical simulation of binary convection within the Soret regime in a tilted cylinder
- Is there a need for an extended phase definition for systems far from equilibrium?
- Existence of the Chapman–Enskog solution and its relation with first-order dissipative fluid theories
- Performance comparison of water towers and combined pumped hydro and compressed gas system and proposing a novel hybrid system to energy storage with a case study of a 50 MW wind farm
- Thermodynamic characterization of transient valve temperatures in diesel engines using probabilistic methods
- Energetic analysis of a non-isothermal linear energy converter operated in reverse mode (I-LEC): heat pump
Articles in the same Issue
- Frontmatter
- Original Research Articles
- Modeling high-pressure viscosities of fatty acid esters and biodiesel fuels based on modified rough hard-sphere-chain model and deep learning method
- Study on heat and mass transfer mechanism of unsaturated porous media under CW laser irradiation: with and without carrier gas
- Efficient ecological function optimization for endoreversible Carnot heat pumps
- Entropy as Noether charge for quasistatic gradient flow
- Numerical simulation of binary convection within the Soret regime in a tilted cylinder
- Is there a need for an extended phase definition for systems far from equilibrium?
- Existence of the Chapman–Enskog solution and its relation with first-order dissipative fluid theories
- Performance comparison of water towers and combined pumped hydro and compressed gas system and proposing a novel hybrid system to energy storage with a case study of a 50 MW wind farm
- Thermodynamic characterization of transient valve temperatures in diesel engines using probabilistic methods
- Energetic analysis of a non-isothermal linear energy converter operated in reverse mode (I-LEC): heat pump