| 分形多孔介质中气体的非稳态扩散 |
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| 引用本文： | 马亮,何榕. 分形多孔介质中气体的非稳态扩散[J]. 化工学报, 2013, 64(9): 3139-3144. DOI: 10.3969/j.issn.0438-1157.2013.09.009 |
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| 作者姓名： | 马亮 何榕 |
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| 作者单位： | 清华大学热科学与动力工程教育部重点实验室, 北京 100084 |
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| 基金项目： | 国家自然科学基金项目，supported by the National Natural Science Foundation of China |
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| 摘 要： | 通过引入平均修正系数修正Fick第二扩散定律得到了描述分形多孔介质气体非稳态扩散的理论方程。基于“塞状流”扩散实验法建立了分形多孔介质非稳态扩散实验系统,对3个孔隙结构不同的分形多孔介质样品进行了非稳态扩散实验,通过实验对理论方程进行验证和修正。结果表明,Fick第二扩散定律不适用于分形多孔介质中气体非稳态扩散,分形多孔介质中气体非稳态扩散存在一定规律,且多孔介质孔隙结构不同其扩散规律不同。
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| 关 键 词： | 多孔介质 非稳态扩散 分形 孔隙结构 |
| 收稿时间： | 2013-01-21 |
| 修稿时间： | 2013-03-14 |
Unsteady state gas diffusion in fractal porous media |
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| MA Liang , HE Rong. Unsteady state gas diffusion in fractal porous media[J]. Journal of Chemical Industry and Engineering(China), 2013, 64(9): 3139-3144. DOI: 10.3969/j.issn.0438-1157.2013.09.009 |
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| Authors: | MA Liang HE Rong |
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| Affiliation: | Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China |
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| Abstract: | An average modified coefficient was used to modify Fick's second law and a theoretical equation was established to describe unsteady state gas diffusion in fractal porous media.The experimental system for unsteady state gas diffusion in fractal porous media was based on the plug flow diffusion.Three different porous medium samples were used to verify and modify the theoretical equation.The results indicate that Fick's second law is not applicable to unsteady state diffusion in fractal porous media,and unsteady state diffusion law in porous media is same under different conditions,and diffusion law in porous media with different pore structures is different. |
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| Keywords: | porous media unsteady state diffusion fractal pore structure |
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