考虑吸附效应的多孔介质热风干燥研究

• 作 者: 汤一村 闵敬春 顾令东
• 机 构: 热科学与动力工程教育部重点实验室,清华大学航天航空学院,北京 100084
• 出 处: 工程热物理学报
• 发表日期: 2018年6期
• 关键词: porous media drying adsorption heat and mass transfer

本文基于Whitaker体积平均理论建立了多孔介质热风干燥的理论模型,结合隐式有限差分法对其进行了离散求解,在处理方程的非线性效应时采用了预估-校正算法.模拟得到了湿含量随干燥时间的变化,并与文献中实验结果做了比较,二者吻合较好,验证了模型的可靠性.模拟了干燥过程中温度、液相饱和度等参数随干燥时间的变化,研究分析了固体骨架的吸附效应对干燥过程的影响.“,”A theoretical model for hot-wind drying of porous media is built based on the Whitaker's volume averaging theory. The partial differential equations are discretized and solved fully implicitly via the finite difference method with a predicator-corrector algorithm being adopted for the non-linear terms. The variations of averaged moisture content with drying time are simulated and the obtained results are compared with those from literature, a good agreement is achieved between them, supporting the reliability of the numerical procedure. The evolutions of temperature and liquid saturation are also simulated and the effects of adsorption of water vapor onto solid matrix on the drying characteristics are investigated and analyzed.