Fluid-heat coupling analysis on heat-transfer in fracture rock mass
Fluid-heat coupling analysis on heat-transfer in fracture rock mass
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发表时间：
2010
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通讯作者：
X. Yi-hong
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作者：
X. Yi-hong
通过分析裂隙岩体的传热和渗流特性，建立了裂隙岩体的传热耦合模型，利用传热微分方程描述裂隙岩体的温度场分布，同时采用加权残值伽辽金有限元法对传热方程进行离散，结合边界条件和参数，数值模拟结果表明，裂隙渗流引起的热传递对裂隙岩体温度场分布有重要影响，随着渗流速度的增大，热传递量增大，当渗流速度较大时，温度等值线的不连续性更明显，传热更不充分;随着渗流速度的减小，传热量减少，传热充分性增加;在低渗流速度条件下，裂隙岩体温度等值线比较光滑，温度梯度较低，温度等值线率沿裂缝流动方向沿着逐渐减小，表明传热速率逐渐减小，流固耦合对裂缝岩石温度场分布有明显影响，流体温度对温度梯度有影响。
By analyzing the heat-transfer and seepage properties of fracture rock,the coupling model of heat-transfer is developed.Temperature field distribution of fracture rock mass is described by using heat-transfer differential equation.At the same time,the heat-transfer equation is discretized by using weighted residual Galerkin finite element.Combined with boundary condition and parameters,the numerical solution is obtained.The numerical simulation results show that the heat transportation resulted from fracture flow has major impact on the temperature field distribution of fracture rock mass.Heat-transfer increases as the increase of the velocity of seepage,and the time reaching thermal equilibrium is cut down.when the seepage velocity is larger,the discontinuity of temperature isoline is more obvious,and heat-transfer is more inadequate.With the reduction of the seepage velocity,the quantity of heat-transfer decreases and sufficiency of heat-transfer increases.Under the condition of low seepage velocity,temperature isoline in fracture rock is smooth,and temperature gradient is lower.The rate of temperature isoline is decreased along the fracture flow,which indicates that the rate of heat-transfer declines gradually.The fluid-solid coupling has evident effects on temperature field distribution of fracture rock,and fluid temperature may influence temperature gradients.