气体压缩系统地延迟粘性指纹的出现
Liam C Morrow1, Callum Cuttle1, Christopher W MacMinn1
1Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom.
在Hele-Shaw细胞中的气体压缩会产生不稳定的流动,延迟粘性指纹. 这种压缩性数,C,是控制手指的关键,特别是在高毛细血管数 (Ca) 时.
科学领域:
- 流体动力学 流体动力学
- 多相流量流的多相流量
- 接口现象 接口现象
背景情况:
- 粘性指纹发生时,粘性较低的液体会在多孔介质或Hele-Shaw细胞中取代粘性较高的液体.
- 指纹通常由气体注射驱动,强度通常由不可压缩气体的毛细血管数 (Ca) 控制.
- 现有的研究重点是抑制手指,通常在稳定流动和不可压缩液体的假设下.
研究的目的:
- 研究气体可压缩性对Hele-Shaw细胞粘性指纹的发生和强度的影响.
- 确定控制气体驱动指纹的关键无维参数,当压缩效应显著时.
- 为了证明气体的压缩性是理解和控制指纹现象的关键因素.
主要方法:
- 使用Hele-Shaw细胞观察气液位移模式的实验研究.
- 无维压缩度数 (C) 和毛细血管数 (Ca) 的系统变化.
- 分析气体压缩引起的不稳定注入速率下的流动动态.
主要成果:
- 气体压缩导致注射速率不稳定,偏离了稳定状态模型.
- 无维压缩度数 (C) 成为不稳定的注射速率的主要控制参数.
- 增加C显然会延迟粘性指纹的出现,特别是在高毛细血管数量 (Ca) 的情况下.
结论:
- 气体压缩性是气体驱动粘性指纹的一个基本因素,但经常被忽视.
- 压缩性数 (C) 为理解和潜在地抑制指纹提供了一个新的框架.
- 控制气体压缩性为管理多相流动不稳定性提供了一种新的策略.
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