摘要
对突发高温作用下多孔介质中发生的动态行为进行了考察。在干燥区采用温度、蒸汽压力和空气压力，在含湿区采用温度、饱和度和空气压力为独立变量来描述多孔介质的热质迁移过程。在数值方法上解决了模型的参数结构和计算速度问题。利用锡的浇铸实验，对模型进行了实验验证。结果表明，在误差允许的范围内，本模型与实验结果较好地相符。利用该数值模型对１０００℃下的开口二维干燥过程进行了模拟。结果表明，突发高温作用下温度的变化速度最快，饱和度的变化最慢，温度、压力、饱和度三者相互关联，综合起来反映了突发高温下传热传质的基本特征。
A three variable model was developed to predict violent transport phenomena due to sudden heating in porous media. Two sets of independent variables were applied to different regions in the porous media during simulation. For wet zone, temperature, wet saturation and air pressure were used as independent variables. For the dry zone, the independent variables are temperature, vapor pressure and air pressure. A highly implicit numerical method was used to solve the strongly dependent nonlinear partial differential equations of the model. The mass and energy balance equations were solved simultaneously using Gaussian elimination and iteration methods. The experimental data agree well with numerical results. The numerical model was used to simulate a drying process under 1000℃. The results show that gas pressure affects the heat and mass transfer greatly under high temperature.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1999年第6期78-82,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金
