DENG Gaige,HE Jianguo,KANG Ningbo.Research on Capillary Water Height Based on Multi-Physical Field Coupling[J].Research of Soil and Water Conservation,2021,28(04):136-141.
基于多物理场耦合的毛细水高度研究
- Title:
- Research on Capillary Water Height Based on Multi-Physical Field Coupling
- 文章编号:
- 1005-3409(2021)04-0136-06
- Keywords:
- height of capillary water; multi-physics coupling; numerical simulation; soil column experiment; field test
- 分类号:
- S152.7
- 文献标志码:
- A
- 摘要:
- 为了研究毛细水的上升规律及机理,通过数值模拟、室内及现场试验开展了不同粒径砂性土条件下的毛细水上升高度的研究。结果表明:在相同压实度条件下,毛细水上升高度与时长呈近似幂函数关系,变化特征是初期高度增加快,到一定程度后增加缓慢; 毛细水上升速度与时长近似呈指数函数关系,初始阶段上升速度较大但随后迅速减小。不同粒径砂土柱毛细水上升高度由大到小依次为:1号管(粒径范围为0.36～0.45 mm),2号管(粒径范围为0.28～0.36 mm),3号管(粒径范围为0.15～0.28 mm),毛细水上升高度与砂土粒径呈负相关,总体表现为粒径越小,毛细水上升高度越大。通过多物理场耦合多孔介质中达西定律和相输运,可以较好模拟毛细水上升高度,并且在试验误差范围内理论值与室内试验结果吻合较好,同时现场试验也验证了数值模拟及实验室土柱试验结论的正确性。可见,多孔介质内部毛细流动现象是由惯性力、黏性力、毛细力与重力共同作用产生的,但在不同毛细高度各项作用力对毛细上升的贡献并不相同,综合作用于毛细水上升过程。
- Abstract:
- In order to study the rising characteristic and mechanism of capillary water, the rising height of capillary water of sandy soil with different grain sizes was studied by numerical simulation under indoor and field tests. The results show that: under the same compaction condition, the rising height of capillary water is approximately in a power function relationship with the duration; the characteristic of the change is that the initial height increases rapidly, and after a certain degree, it increases slowly; the rising speed of capillary water is approximately exponentially related to the duration, and the specific performance is that the rising speed is relatively large in the initial stage but then rapidly decreases; the ascending height of the capillary water of the sandy soil column with different particle sizes follows the order of No. 1 tube(the particle size range is 0.36～0.45 mm)>No. 2 tube(the particle size range is 0.28～0.36 mm)> No. 3 tube(the particle size range is 0.15～0.28 mm), the rising height of capillary water is negatively correlated with the particle size of sand, the overall performance is that the smaller the particle size, the greater the rising height of capillary water; through multi-physics coupling Darcy's law and phase transport in porous media, the capillary water rising height can be simulated better, and the theoretical value is in good agreement with the laboratory test results within the experimental error range, at the same time, the field test also verifies the correctness of the conclusions of numerical simulation and laboratory soil column test. The research shows that the capillary flow phenomenon in porous media is caused by inertial force, viscous force, capillary force and gravity. However, at different capillary heights, the contribution of each force to capillary rise is different, and it comprehensively acts on the capillary water rise process.
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备注/Memo
收稿日期:2020-08-24 修回日期:2020-10-02资助项目:宁夏回族自治区重点研发计划重大科技项目“宁夏特色果蔬冷链关键技术装备研发与示范”(2018BCF01001)第一作者:邓改革(1987—),男,河南洛阳人,博士,研究方向为水利水电工程。E-mail:mood.happy@163.com通信作者:何建国(1960—),男,山东济南人,教授,博士生导师,主要从事农业工程自动化装备研究。E-mail:hejg@nxu.edu.cn