煤岩体接触面不同倾角的传热影响

为得到煤岩体接触面倾角不同时的传热规律,对6种不同倾角组合的煤岩体进行数值模拟研究,建立不同孔隙率和渗透率的多孔介质稳态传热模型,考虑煤岩体y轴方向的重力加速度,黏性阻力系数和内部阻力系数,运用传热学,流体力学,多孔介质对流传热等相关理论,并引入Brinkman-Forchheimer的扩展Darcy模型,采用控制体积法对煤岩体模型进行求解。计算结果表明:通过温度场可知,随着倾角的增加,高温边界下部导热增强,煤岩体中央对流换热开始占主要作用,低温边界上部导热减弱;通过流场可知,岩石区域中央处流场的对流作用最弱(Ф=0.000 1),靠近边界条件处对流作用最强(Ф=0.001 3),随着倾角的增加,对流作用减弱。流动状态在接触面有突变,温度场和流线相互对应。

Heat transfer effect of coal-rock combination bodies of different interface inclined angles

In order to obtain heat transfer law at different interface angle，numerical simulation on 6 different inclined angles coal-rock combination bodies were studied.Porous medium steady heat transfer models at different porosity and permeability were established.Considered gravity acceleration of y-axis，viscous resistance coefficient and internal resistance coefficient，used heat transfer，fluid mechanics，porous medium convective heat transfer and some related theory，Brinkman-Forchheimer’s extend Darcy model was introduced and the coal-rock combination bodies model was used to control volume method.The results show that，from the temperature field，with the increase of angle，thermal conductivity of the lower part of high temperature boundary increases.The convective heat transfer in the central of the coal-rock combination bodies begin to play a major role and the thermal conductivity of upper part of low temperature boundary decreases.From the flow field，the convection effects in the central of the rock part is the weakest(=0.000 1)，and the convection effects near the boundary conditions is strongest(=0.001 3).The convection effects decrease with the angles increase.Flow state of interface has mutation，temperature field and streamline corresponding each other.