巷壁与风流间对流换热系数计算及敏感性分析
Calculation and sensitivity analysis of convective heat transfer coefficient between roadway wall and airflow
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摘要: 为准确计算矿井巷道风流与巷壁间的对流换热系数，根据巷道风流与巷壁间的热湿交换原理，考虑巷壁潮湿、巷道风流为湿空气及巷壁粗糙特征等矿井实际生产情况，将对流换热系数表示为风温、风速、潮湿率、巷道尺寸、巷壁温度、热物性参数及摩擦阻力系数等可测参数的函数；基于对流换热系数的表达式，利用敏感性分析法，主要讨论了对流换热系数对巷道风速、巷道半径及巷道摩擦阻力系数等3个因素的敏感程度。结果表明：3个因素的影响敏感程度具有较明显差异，其中巷道风速是影响对流换热系数的最敏感因素，对流换热系数对巷道摩擦阻力系数敏感性次之，对巷道半径敏感度最低，且当巷道半径在一定范围内变化时对流换热系数对巷道半径的敏感度较低，此时可忽略其对换热系数的影响。Abstract: In order to accurately calculate the convective heat transfer coefficient between the mine roadway air flow and the roadway wall, according to the heat and moisture exchange principle between the roadway air flow and the roadway wall, and considering the actual production conditions of the mine such as the wet roadway wall, the humid air of the roadway air flow and the roughness of the roadway wall, the convective heat transfer coefficient is expressed as the wind temperature, wind speed, moisture rate, roadway size, roadway wall temperature, thermal physical parameters and friction resistance coefficient. Based on the expression of convective heat transfer coefficient, the sensitivity of convective heat transfer coefficient to the three factors of roadway wind speed, roadway radius and roadway friction resistance coefficient is mainly discussed by using sensitivity analysis method. The results show that the sensitivity of the three factors is significantly different, among which the wind speed of the roadway is the most sensitive factor affecting the convective heat transfer coefficient, and the sensitivity of convective heat transfer coefficient to roadway friction resistance coefficient is second, and the sensitivity of convective heat transfer coefficient to the roadway radius is the lowest. When the roadway radius changes within a certain range, the convective heat transfer coefficient is less sensitive to the roadway radius, and its influence on the heat transfer coefficient can be ignored at this time.
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