当前位置: X-MOL 学术Appl. Therm. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Conjugate modeling of flow and simultaneous heat and mass transfer in convective drying of porous substances
Applied Thermal Engineering ( IF 6.4 ) Pub Date : 2021-09-22 , DOI: 10.1016/j.applthermaleng.2021.117571
Anwen Zhao 1 , Xiaoting Rui 1 , Bao Rong 1 , Guoping Wang 1
Affiliation  

An in-depth understanding of the convective drying mechanism is significant for improving industrial production efficiency and reducing available energy consumption. In this research, a conjugate numerical model appropriate for representing the convective drying is developed and incorporated into the computational fluid dynamics framework, which adopts a non-equilibrium approach to depict the thermal transfer between the hot air and wet porous substances. The thermophysical properties of wet porous substances are formulated to change dynamically in response to the variation of moisture content. A concept of two-resistance dynamic equilibrium is introduced to characterize the interstitial mass exchange between phases, in which the void surfaces of wet porous substances are treated as phase interfaces. That numerical model is then validated by simulating the convective drying of apple slices for different airflow conditions. Calculation results show that the numerical model is capable of accurately predicting the time history of moisture content. The simulative results are in excellent agreement with experimental data as well. The flow distribution of field variables, the non-equilibrium thermal transfer, and the interstitial mass exchanges are also effectively captured. It indicates that the present conjugate numerical model can predict the pivotal physical phenomena involved in convective drying.



中文翻译:

多孔物质对流干燥中流动和同时传热传质的共轭建模

深入了解对流干燥机理对于提高工业生产效率和降低可用能源消耗具有重要意义。在这项研究中,开发了一种适合表示对流干燥的共轭数值模型,并将其纳入计算流体动力学框架,该模型采用非平衡方法来描述热空气和湿多孔物质之间的热传递。湿多孔物质的热物理特性被制定为响应含水量的变化而动态变化。引入双电阻动态平衡的概念来表征相间的间隙质量交换,其中湿多孔物质的空隙表面被视为相界面。然后通过模拟不同气流条件下苹果切片的对流干燥来验证该数值模型。计算结果表明,该数值模型能够准确预测含水量的时程。模拟结果也与实验数据非常吻合。场变量的流动分布、非平衡热传递和间隙质量交换也被有效地捕获。这表明目前的共轭数值模型可以预测对流干燥中涉及的关键物理现象。模拟结果也与实验数据非常吻合。场变量的流动分布、非平衡热传递和间隙质量交换也被有效地捕获。这表明目前的共轭数值模型可以预测对流干燥中涉及的关键物理现象。模拟结果也与实验数据非常吻合。场变量的流动分布、非平衡热传递和间隙质量交换也被有效地捕获。这表明目前的共轭数值模型可以预测对流干燥中涉及的关键物理现象。

更新日期:2021-09-27
down
wechat
bug