风流与湿润围岩的热-质交换特性及其影响因素研究

Research on mass and heat transfer characteristics and its impact factors between air flow and wet surrounding rock

为了分析风流与完全湿润岩壁的热-质交换特性及相关影响因素,通过相似理论建立了物理模型,解决了相关问题难以现场实测的难题,分析了冷风流与完全湿润围岩间的传热与传质过程,进一步研究了风流速度、湿度、温度、围岩岩壁温度等因素对降温控制区内传质及传热的影响。结果表明假定降温控制区域内风流的水蒸气分压力为线性分布时,计算结果的误差为5%~10%;交换过程中潜热传递约占总换热量的80%;其他条件一定时,风流速度增加25%,传质量增加约33%;送风相对湿度增加12.5%,传质量减少约11%;送风温度增加10%,换热系数增加约10%;围岩温度增加8℃,传质量增加约79%;对传质过程有影响的因素,对换热量及总换热系数也有同样重要的影响。

In order to analyze the heat and mass transfer features and related influence factors between the air flow and the full wet rock wall,a similarity theory was applied to establish a physical model. Thus the related problems and the site measurement problems were solved. The heat and mass transfer processes between the cool air flow and the full wet surrounding rock was analyzed. The air flow velocity,humidity,temperature,surrounding rock wall temperature and other factors affected to the heat and mass transfer in the temperature cooling control area were further studied.The results showed that when the water vapor pressure of the air flow within the assumed cooling temperature control area was in a linear distribution,the error of the calculation results would be 5% ~ 10%. During the changing process,the latent heat transfer would be 80% of the total heat transfer volume. When other conditions were certain,the air flow velocity would be increased by 25% and the mass transfer volume would be increased about 33%. The relative humidity of the air ventilation would be increased by 12.5% and the mass transfer would be reduced by 11%. The temperature of the air ventilation would be increased by 10% and the heat change coefficient would be increased by 10%. The temperature of the surround rock would be increased by 8 ℃ and the mass transfer would be increased by 79%. The factors would be influenced to the mass transfer process and also could have same important influences to the heat transfer volume and the total heat transfer coefficient.