交叉裂隙开度对滴状水流分流行为的影响

薛松; 杨志兵; 陈益峰; 童富果

doi:10.11779/CJGE20211415

交叉裂隙开度对滴状水流分流行为的影响 English Version

薛松^{1, 2, 3,},
杨志兵^{2, 3, ,},
陈益峰^{2, 3},
童富果¹

1.
三峡大学水利与环境学院, 湖北宜昌 443002
2.
武汉大学水资源与水电工程科学国家重点实验室, 湖北武汉 430072
3.
武汉大学水工岩石力学教育部重点实验室, 湖北武汉 430072

基金项目:

国家杰出青年科学基金项目 51925906

国家自然科学基金重点项目 51939004

国家自然科学基金面上项目 42077177

国家自然科学基金青年项目 52209135

详细信息

作者简介:
薛松(1992—)，男，博士，讲师，主要从事地下孔隙裂隙介质多相渗流方面研究。E-mail：xuesong@ctgu.edu.cn

通讯作者:
杨志兵，E-mail: zbyang@whu.edu.cn

中图分类号: TU452
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- PDF下载量: 45
出版历程
- 收稿日期: 2021-11-29
- 网络出版日期: 2023-02-03
- 发布日期: 2021-11-29
- 刊出日期: 2022-12-31

Effects of fracture apertures on droplet splitting through unsaturated fracture intersections

XUE Song^{1, 2, 3,},
YANG Zhibing^{2, 3, ,},
CHEN Yifeng^{2, 3},
TONG Fuguo¹

1.
College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China
2.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
3.
Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan 430072, China

摘要

摘要: 深入理解交叉裂隙渗流行为是预测裂隙网络渗流特性的关键。非饱和条件下交叉裂隙渗流与液体流态、交叉几何特征密切相关。针对低流量、低饱和度条件下的滴状渗流，开展了交叉裂隙液体分流模拟，发现了交叉处分流存在由液滴长度控制的主通道流动占优和支通道流动占优两种模式，并提出了关键液滴长度指标作为其临界条件。通过改变交叉裂隙主通道开度 ${w_1}$ 和支通道开度 ${w_2}$ ，系统探究了交叉裂隙开度对分流模式的影响规律及机制。模拟结果表明关键液滴长度受到通道毛细力和通道过流能力的联合控制；当两者对分流作用效果相反时关键液滴长度随裂隙开度 ${w_1}$ 呈非单调变化，而当两者作用效果一致时则随裂隙开度 ${w_1}$ 呈单调变化。此外，存在一个相对稳定的最优开度比 ${w_2}$ / ${w_1}$ 范围使关键液滴长度最大。研究成果为预测低流量、低饱和度条件下裂隙岩体渗流结构提供了理论和数据支撑。
- 交叉裂隙 /
- 非饱和渗流 /
- 滴状水流 /
- 裂隙开度
Abstract: An in-depth understanding of liquid flows through fracture intersections is important for predicting the seepage characteristics of fracture networks. The flow behavior of liquid at unsaturated intersections is closely related to the flow mode and geometric characteristics of fractures. A modeling study is given on the physical process of droplet splitting through unsaturated fracture intersections, which usually occurs under low flow rate and low saturation conditions. The effects of fracture apertures on droplet splitting behaviors are systematically investigated by varying the main channel width w₁ and the branch width w₂ of the fracture intersection. It is found that there are two droplet splitting patterns related to the droplet length: the flows dominated by the main channel and those dominated by the branch, which can be distinguished by the critical droplet length. This critical length is controlled by capillary force and permeability of channels, both varying with the channel widths. When the two controlling factors have opposite effects on the droplet splitting, the critical droplet length changes non-monotonously with w₂. Conversely, the critical droplet length changes monotonously with w₁. In addition, there is an optimal range for the width ratio w₂/w₁ to maximize the critical droplet length. This study provides theoretical support for predicting the seepage structure of fractured rocks under the conditions of low flow and low saturation.
- fracture intersection /
- unsaturated flow /
- droplet flow /
- fracture aperture

HTML全文

图 1 T型交叉裂隙液滴分流示意图

Figure 1. Schematic diagrams of a droplet splitting at a T-junction

下载: 全尺寸图片幻灯片

图 2 交叉处流量Q和瞬态分流比例η随时间t^*的演化

Figure 2. Evolution of volumetric flow rate Q and transient splitting ratio η with time t^*

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开度 ${w_2}$ 对液滴分流过程的影响：(a)~(c)流量 ${Q_{{\text{C2}}}}$ 和随时间t^*的演变；(d)~(f)瞬态分流比例η随时间t^*的演变

Effects of width of channel C2 ${w_2}$ on process of dropletsplitting: (a)~(c) evolution of volumetric flow rate ${Q_{{\text{C2}}}}$ with time t^*; (d)~(f) evolution of transient splitting ratio η with time t^*

下载: 全尺寸图片幻灯片

图 4 关键长度L_crit和累积分流比例η^*随开度 ${w_2}$ 的演化

Figure 4. Evolution of the critical droplet length L_crit and cumulative splitting ratio η^* with width ${w_2}$

下载: 全尺寸图片幻灯片

开度 ${w_1}$ 对液滴分流过程的影响：(a)~(c)流量Q_C1随时间t^*演变；(d)~(f)瞬态分流比例η随时间t^*的演变

Effects of width of channel C2 ${w_2}$ on process of droplet splitting: (a)~(c) evolution of volumetric flow rate Q_C1 with time t^*; (d)~(f) evolution of transient splitting ratio η with time t^*

下载: 全尺寸图片幻灯片

图 6 关键长度L_crit和累积分流比例η^*随开度 ${w_1}$ 的演化

Figure 6. Evolution of critical droplet length L_crit and cumulative splitting ratio η^* with width w₁

下载: 全尺寸图片幻灯片

图 7 不同裂隙开度组合下关键液滴长度L_crit的演化

Figure 7. Effects of combination of channel widths w₁ and w₂ on critical droplet length L_crit

下载: 全尺寸图片幻灯片

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