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Experimental Investigation of Long time Behavior of Interfacial Waves in a Two Layer Immiscible Fluid

Safaie Nematollahi, Ammar | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43957 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jamali, Mirmosadegh
  7. Abstract:
  8. The motion of a surface wave in a two-layer fluid can lead to generation of sub-harmonic interfacial waves through a nonlinear resonant interaction mechanism. The interfacial waves grow exponentially in time until they reach a maximum amplitude and then oscillate down to a final amplitude, referred to as ultimate amplitude, in long term. This may lead to considerable mixing of the layers in miscible fluid and increase the thickness of the diffuse layer. Experiments show that the diffuse layer causes frequency shift and decreases the ultimate amplitude. In this study, long time behavior of interfacial waves in a two layer immiscible fluid was investigated. A two-layer immiscible system consisting of kerosene and fresh water was used to study the wave interaction phenomenon in absence of diffusion effects. Three image processing methods were presented for detection of interfacial waves forming a three-dimensional pattern at the interface between two fluid layers. The physical parameters of the interfacial and the surface waves such as frequencies and wave numbers, and the temporal variations of wave amplitudes were obtained by these methods. The results confirm the theoretical prediction of the exponential behavior of the interfacial wave and show an excellent agreement with Fazeli (2012)’s analytical model. However, in a same experiment with miscible fluid the analytical model overestimated the ultimate Amplitude which approves the importance of the diffusion effect
  9. Keywords:
  10. Immiscible Fluid ; Two-Layer Fluid ; Internal Waves ; Resonant Interaction

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