Experimental Study of Two-Phase Slug Flow in Rectangular Tunnls with Adverse Slope

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Karimpour, Farid | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 40407 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Borghei, Mahmoud
Abstract:
Slug Flow is one of the most important schemes of two-phase air/water flow, which is quite complex and quite different to a single-phase flow. Also one of the common water conveyance systems is a rectangular tunnel which may have adverse slope at some parts of the tunnel. In this study the hydraulic of slug flow in rectangular tunnels with variable slope from horizontal to adverse have been considered using experimental setup. About 150 tests were carried out for different air/water discharge ratios and adverse slopes, and dynamic pressure fluctuations together with the slug period were measured. It was observed that the pressure fluctuations increase as the air to water ratio increases and the slug cross-section, and slug period increases with larger adverse slope. Also, it was observed that there is a relation between the slug period with the ratio of water Reynolds to air Reynolds numbers and the air to water density ratio. Also, there is a relation between air to water ratio and the average pressure in the section where the slope changes from horizontal to adverse slope. Finally the results are presented by diagrams and design relations
Keywords:
Two Phase Flow ; Experimental Model ; Slug Flow ; Rectangular Tunnel ; Adverse Slope ; Dynamic Pressure Fluctuations

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