| 湍流场中物质微元的形态特征及相应的模型 |
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| 引用本文： | 李希,陈建峰,陈甘棠.湍流场中物质微元的形态特征及相应的模型[J].力学学报,1994,26(3):266-274. |
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| 作者姓名： | 李希 陈建峰 陈甘棠 |
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| 作者单位： | 杭州市浙江大学化工系联合所，310027 |
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| 摘 要： | 运用高速显微摄影方法对１０￣１…１０￣３ｕｍ尺度上的微观混和过程进行了实验观察，将物质微元的形态特征归结为片状与条状两类。在此基础上，提出了片状结构模型，将微观混和描述为片状微元上的收缩变形与分子扩散。分析表明，由于变形与扩散之间的相互作用，微元上分子扩散区的宽度将趋于某一尺度δ＝１２λＢ，从而使微元体积呈指数增长，ｖ～ｅｘｐ（ｓｆ）．微观混和对化学反应的影响可用Ｄａｍｋ６ｈｌｅｒ数Ｄａ来表征，模型能够正确模拟这种影响。
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| 关 键 词： | 湍流混和，微观混和，高速显微摄影 |
MORPHOLOGICAL CONFIGURATIONS OF MATERIALELEMENTS DURNG TURBULENT MIXING──EXPERIMENTAL STUDY AND MODELLING |
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| LiXi, ChenJianfeng, ChenGantang.MORPHOLOGICAL CONFIGURATIONS OF MATERIALELEMENTS DURNG TURBULENT MIXING──EXPERIMENTAL STUDY AND MODELLING[J].chinese journal of theoretical and applied mechanics,1994,26(3):266-274. |
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| Authors: | LiXi ChenJianfeng ChenGantang |
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| Abstract: | Different morphology of the materials of the Kolmogoroff scale seemsto be the main difference among the several mechanistic models of nncromining. A highspeed microphotography method was employed to investigate the configuration of materialelements of 10￣1-10￣3um during turbulent intong. The microphotographs showed that theelements tend to exhibit slice-like and striplike configurations during mixing. Based onthis evidence a new micromixing model was proposed. The element was modelled by aslab surrounded by... |
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| Keywords: | turbulent mixing micromixing high speed microphotography morphol-ogy |
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