Startseite Study on heat and mass transfer mechanism of unsaturated porous media under CW laser irradiation: with and without carrier gas
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Study on heat and mass transfer mechanism of unsaturated porous media under CW laser irradiation: with and without carrier gas

  • Shao-Hui Han , Yuan Dong EMAIL logo und Guang-Yong Jin EMAIL logo
Veröffentlicht/Copyright: 3. Januar 2025
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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.


Corresponding authors: Yuan Dong and Guang-Yong Jin, Jilin Key Laboratory of Solid Laser Technology and Application, School of Physics, Changchun University of Science and Technology, Changchun 130022, China, E-mail:  (Y. Dong), (G.-Y. Jin)

Acknowledgments

We thank the Key Laboratory of Jilin Province Solid-State Laser Technology and Application for the use of the equipment.

  1. Research ethics: Not applicable.

  2. Informed consent: Not applicable.

  3. Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interest: The authors state no conflict of interest.

  6. Research funding: None declared.

  7. Data availability: The raw data can be obtained on request from the corresponding author.

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Received: 2024-04-14
Accepted: 2024-12-10
Published Online: 2025-01-03
Published in Print: 2025-04-28

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