不同接触面厚度煤岩体三维建模与传热

Three-dimensional modeling and heat transfer analysis for coal rock masses with different thickness interface

为揭示不同接触面厚度煤岩体内热量传递情况,采用理论分析和数值计算方法,推导了多孔介质内连续性方程、动量方程和能量方程新的表达形式,分析了接触面厚度不同对煤岩体传热影响.计算结果表明:接触面厚度为2 mm和5 mm的煤岩体高温壁面下部导热作用最强;接触面厚度为3 mm和4 mm的煤岩体低温壁面上部导热作用最强;接触面厚度为2 mm和5 mm的煤岩体高温壁面中下部自然对流强;煤岩体壁面附近自然对流强,中央区域自然对流弱;煤岩体高低温壁面附近导热占主导;接触面厚度为2 mm和5 mm煤岩体热量传递情况相同,3mm和4mm煤岩体热量传递情况相同.

To reveal the different thickness of interface heat transfer within the coal and rock, the theoretical analysis and numerical calculation method are adopted, deducing the new expression of Continuity equation, Dynamics equation and Energy equation, to analyze the different contact surface thickness effect on the coal and rock heat transfer.The results show that thermal conductivity of the lower part of coal-rock combination bodies＇ high temperature wall is strongest, which the thickness of interface is 2mm and 5mm.The natural convection at middle and lower part of coal-rock combination bodies＇ high temperature wall is strong. The natural convection is strong near the wall of coal-rock combination bodies, and that is weak in the central region. The thermal conductivity is dominant near the high and the low temperature wall. The heat transfer laws are the same when the interface thicknesses are 2mm and 5mm. So they are when the interface thicknesses are 3mm and 4mm.