用数值分析了解受地下水流入和热源配置影响的断裂岩石中的散热情况
Xiao-Long Wu1, Bernard Kueper1, Kent Novakowski1
1Department of Civil Engineering, Queen's University, Kingston, ON K7L 3N9, Canada.
Journal of contaminant hydrology
|July 1, 2023
概括
了解破碎岩石中的热散热对于低温热修复至关重要. 这项研究揭示了热源,地下水流和岩石特性显著影响温度差异,提出的系数将散热与传导性相关联.
科学领域:
- 地质科学 地质科学
- 环境工程 环境工程
- 水文地质学 水文地质学
背景情况:
- 评估破碎岩石中的散热对于低温热修复应用至关重要.
- 了解破碎岩石中的热水学过程是管理地下热量的关键.
- 破碎的岩石形成对热能转移和地下修复提出了独特的挑战.
研究的目的:
- 通过使用数值建模,研究破碎岩石中的散热和热水学过程.
- 为了确定控制空间温度变化的关键因素在一个缩放的热源和可变的地下水流.
- 开发一项衡量标准,用于评估与岩石质量传导性相关的散热效应.
主要方法:
- 一个三维数值模型模拟了碎裂和不透的岩层中的热水学过程.
- 全球灵敏度分析,使用离散的拉丁-超立方体-一次性方法,对热源,地下水流和岩石特性进行了分析.
- 导出一个散热系数来将散热与传导性相关联,并通过加拿大现场实验案例研究进行验证.
主要成果:
- 灵敏度分析将散热的控制变量排列为:热源>地下水>岩石特性.
- 地下水的流入和岩层热传导被确定为上游和下游加热区的关键因素.
- 在散热系数和破碎岩石传导性之间发现了一个单调的关系,在1x10^-6和2x10^-5m2/s之间迅速增加.
结论:
- 低温热修复是由于显著的散热导致的高气候破裂岩石的可行技术.
- 地下水流和岩石特性极大地影响了碎石热修复的有效性.
- 拟议的散热系数为评估破碎岩石现场适合热修复提供了一个有价值的工具.
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