建立传热模型以评估通风洞穴中的对流长度

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Amir Sedaghatkish, Claudio Pastore, Frédéric Doumenc, Pierre-Yves Jeannin, Marc Luetscher
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引用次数: 0

摘要

本研究的重点是通风洞穴中的热传递,在这种洞穴中,气流是由洞穴和外部大气之间的温度反差驱动的。我们使用一个数值模型,将单个岩溶导管中气流引起的对流传热与岩体中的传导传热结合起来。假设空气干燥且几何形状简化,我们研究了热扰动在岩溶岩体内部的传播。我们进行了参数研究,以确定空气流速和导管大小对热扰动振幅和空间范围影响的一般趋势。数值结果支持将洞穴划分为三个区域:(a) 短(几米)扩散区,热量主要通过岩体中的传导从外部大气传播;(b) 对流区,热量主要通过气流传播;(c) 深岩溶区,其特点是全年温度准恒定。数值模拟显示,对流区的长度与流速年波动幅度除以洞穴半径的平方根大致成正比。这一结果通过一个矿井隧道和两个洞穴的实地数据进行了检验。我们的研究为确定气候敏感区域提供了初步估算,可用于岩浆岩科学和/或生态系统研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Modeling Heat Transfer for Assessing the Convection Length in Ventilated Caves

Modeling Heat Transfer for Assessing the Convection Length in Ventilated Caves

The present study focuses on heat transfer in ventilated caves for which the airflow is driven by the temperature contrast between the cave and the external atmosphere. We use a numerical model that couples the convective heat transfer due to the airflow in a single karst conduit with the conductive heat transfer in the rock mass. Assuming dry air and a simplified geometry, we investigate the propagation of thermal perturbations inside the karst massif. We perform a parametric study to identify general trends regarding the effect of the air flowrate and conduit size on the amplitude and spatial extent of thermal perturbations. Numerical results support the partition of a cave into three regions: (a) a short (few meters) diffusive region, where heat mainly propagates from the external atmosphere by conduction in the rock mass; (b) a convective region where heat is mainly transported by the air flow; (c) a deep karst region characterized by quasi-constant temperatures throughout the year. Numerical simulations show that the length of the convective region is approximately proportional to the amplitude of the flowrate annual fluctuations divided by the square root of the cave radius. This result is tested against field data from a mine tunnel and two caves. Our study provides first estimates to identify climate sensitive regions for speleothem science and/or ecosystemic studies.

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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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