微波干燥吸湿性多孔材料过程表征
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摘要
微波干燥吸湿性多孔材料具有干燥时间短和节能高效的优势。然而干燥的不均匀和干燥品质不高的问题制约了微波干燥吸湿性多孔材料的广泛应用。微波干燥吸湿性多孔材料具有多物理场耦合、多时间尺度、多相态变化的特点。文章给出了微波干燥多孔材料传热传质过程涉及的连续性方程、动量守恒方程和能量守恒方程,从而为数值仿真计算获得微波干燥过程温度变化和湿分的迁移情况提供基础。
Microwave drying hygroscopic porous materials has the advantages of short drying time, energy saving and high efficiency. However, the uneven drying and low drying quality restrict the wide application of microwave drying hygroscopic porous materials. Microwave drying hygroscopic porous materials have the characteristics of multi-physical field coupling, multi-time scale and multi-phase state change. In this paper, the continuity equation, momentum conservation equation and energy conservation equation involved in the heat and mass transfer process of microwave drying porous materials are given, which provides a basis for numerical simulation to obtain the temperature change and moisture transfer in microwave drying process.
Microwave drying hygroscopic porous materials has the advantages of short drying time, energy saving and high efficiency. However, the uneven drying and low drying quality restrict the wide application of microwave drying hygroscopic porous materials. Microwave drying hygroscopic porous materials have the characteristics of multi-physical field coupling, multi-time scale and multi-phase state change. In this paper, the continuity equation, momentum conservation equation and energy conservation equation involved in the heat and mass transfer process of microwave drying porous materials are given, which provides a basis for numerical simulation to obtain the temperature change and moisture transfer in microwave drying process.
引文
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[8]宋瑞凯,张付杰,杨薇,等.马铃薯微波干燥动力学建模与仿真[J].湖南农业大学学报(自然科学版),2018,44(2):204-209.
[2]刘伟,范爱武,黄晓明.多孔介质传热传质理论与应用[M].科学出版社,2006.
[3]刘兴鹏,严丹丹.吸湿性多孔材料介电特性表征[J].科技创新与应用,2018(9):10-11.
[4]Ni H,Datta A K,Torrance K E.Moisture transport in intensive microwave heating of biomaterials:a multiphase porous media model[J].International Journal of Heat and Mass Transfer,1999,42(8):1501-1512.
[5]Chen J,Pitchai K,Birla S,et al.Simulation of Microwave Heating of Porous Media Coupled with Heat,Mass and Momentum Transfer[J].2012.
[6]Defraeye T.Advanced computational modelling for drying processes-A review[J].Applied Energy,2014,131:323-344.
[7]姚连升.褐煤微波干燥及水分迁移特性试验研究[D].山东大学,2015.
[8]宋瑞凯,张付杰,杨薇,等.马铃薯微波干燥动力学建模与仿真[J].湖南农业大学学报(自然科学版),2018,44(2):204-209.