| 李洪,许唯临,李克锋,李嘉.悬浮颗粒在明渠剪切紊流中扩散系数计算公式研究[J].水利学报,2002,33(8):0047-0053 |
| 悬浮颗粒在明渠剪切紊流中扩散系数计算公式研究 |
| Study on particle diffusion coefficient of turbulent shear flow in open channel |
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| DOI： |
| 中文关键词: 固液两相流 扩散系数 速度差 |
| 英文关键词: environmental variable effective variable comprehensive evaluation weighted area |
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| 中文摘要: |
| 本文利用各向同性均匀紊流理论推导了明渠剪切紊流中心区固-液两相速度差的计算公式, 结果表明固液两相速度差依赖于颗粒密度、尺寸以及流体的平均速度和水力半径. 进而研究了悬浮颗粒在紊流中的扩散系数, 给出了紊流中的悬浮颗粒扩散系数的计算公式. 该公式充分考虑了悬浮颗粒粒径、密度等颗粒特征参数以及流体粘性系数、平均流速和水力半径等水流参数对悬浮颗粒在紊中的影响, 能够比较全面地描述悬浮颗粒在紊流中的扩散情况. 为了验证固-液两相流速度差计算公式, 作者进行了水槽实验, 实验结果与计算结果吻合良好. |
| 英文摘要: |
| The concept of distance is introduced to describe the comprehensive influence of environmental variables on affected variables in dam safety monitoring data analysis. Definitions of distance for various variables are defined. The weighted area distance is defined as the moment of the area, formed by the variation graph of environmental component and the base line, about the base line. Then, the rationality of the weighted area distance is demonstrated and the approach to calculate the base value is deduced. An application example is given for demonstration and the validity of proposed method is verified. |
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