- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LUO Chongliang, YU Yunyan, ZHANG Jing, CUI Wenhao, DU Qianzhong, DING Xiaogang. Heat-Mass Transfer Test and Coupling Model of Sulfate Saline Soil[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 470-478. doi: 10.3969/j.issn.0258-2724.20220633
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In order to study the heat and mass transfer behavior of saline soil in western cold-arid regions, firstly unsaturated sulfate saline soil experienced unidirectional freezing tests with no pressure recharge. In addition, while the latent heat of crystallization, crystallization impedance and crystallization consumption are considered, a three-field coupling model of water-heat-salt for unsaturated sulfate saline soil is established. Finally, COMSOL Multi-physics is used to simulate the coupling model, the simulation results of which are then compared with the experimental data for analysis. The results show that the internal temperature of saline soils develops in three stages with the freezing time, gradually forming a temperature gradient of cold at the top and warm at the bottom. Driven by both temperature gradient and matrix suction, water and salt migrate to the freezing front position, and the water and salt contents reach peaks at the freezing front position, and compared with the initial values, the peak water content and salt content increase by 2.16% and 0.28%, respectively. The freezing front moves along the frozen temperature line, and forms a freezing front. The maximum freezing depth of soil column is about 15.5 cm.
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