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| Study of heat and moisture transport of superheated steam in porous media |
| CHEN Zhi-xin, HU Li-ming |
| Key Laboratory of Hydrosphere Sciences of the Ministry of Water Resources, Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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Abstract The significant process for the thermal remediation of organic-contaminated soil using steam enhanced extraction technique is the heat and moisture transport of superheated steam within porous media. A two-dimensional experimental system was developed and a series of tests are conducted to investigate the transport behavior of superheated steam in porous media with different particle size. The findings reveal that injecting superheated steam at a constant flow rate quickly increases the temperature of the glass bead assemblies in the model, though the steam pressure increases at a slower rate than the temperature at the same location. The patterns of vapor pressure changes within the glass bead assemblies align closely with temperature variations, suggesting that heat transfer is primarily driven by the latent heat released during vapor migration. Additionally, thermal infrared imaging effectively tracks the progression of the temperature field during steam migration. Smaller particle sizes tend to slow the advance of both the steam condensation and superheated steam fronts.
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Received: 29 October 2023
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