MORPHOLOGICAL CONFIGURATIONS OF MATERIALELEMENTS DURNG TURBULENT MIXING──EXPERIMENTAL STUDY AND MODELLING
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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。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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Key words:
- turbulent mixing /
- micromixing /
- high speed microphotography
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