| 范家骅.异重流交界面波动失稳条件[J].水利学报,2010,41(7): |
| 异重流交界面波动失稳条件 |
| Interfacial instability in density currents |
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| DOI： |
| 中文关键词: 异重流 异重流交界面 浮泥起动流速 盐水楔界面混合 |
| 英文关键词: Interfacial instability critical velocity for mud suspension interfacial wave breaking |
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| 摘要点击次数: 1982 |
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| 中文摘要: |
| 本文讨论盐水或浑水 （浮泥） 交界面在水流作用下，发生不同振幅和频率的交界面波动，乃至界面波失去稳定时的水力和介质密度性质的条件。通过试验观察浮泥层在水力作用下交界面波动以及界面波失去稳定时的物理现象，测定了界面波破碎的临界流速。该结果与盐水的临界流速试验结果，可用于估计两种异重流交界面的临界流速。进一步的研究发现用Keulegan的界面波失去稳定的条件，即Uc和( νgΔρ/ρ) 1/3的关系，也可估计其临界流速。由于盐水和浑水的运动黏滞系数ν与密度差的关系有相同的规律，故可用较简单的密度差和临界流速的关系线，估计界面波失去稳定时的临界流速。 |
| 英文摘要: |
| Critical velocity of wave breaking at the interface between clay mud suspension and interface of clear water and saline water was discussed. This physical phenomenon was observed in experiments. The critical velocities for wave breaking were recorded. Experimental curves of critical velocity Uc，versus(Δρ ) 1/2and Ucversus (νgΔρ/ρ ) 1/3 were plotted for the saline water and mud suspension. Because the relationship between the measured υ and ( Δρ) is the same for both the saline and turbid water layers，the curve of Uc versus ( Δρ) 1/2 can be used as a conventional method to estimate the critical velocity. |
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