Hydraulics & Waterways

Oral

397556 - Preliminary research on air pocket entrapments caused by shear-flow instabilities in rapid-filling pipes

Monday, June 4
4:00 PM - 5:30 PM
Location: Regency Room

“Preliminary research on air pocket entrapments caused by shear-flow instabilities in rapid-filling pipes”
Yasemin Eldayih
Jose G. Vasconcelos

The understanding of the behavior of air-water interactions in closed conduits is important for many existing urban water systems present these two fluids simultaneously. Among different mechanisms for air pocket appearance in closed conduits, shear flow instability is one that have significant capability to capture large volumes of air. Upon capture, air can impact surging and, upon uncontrolled release, lead to issues such as manhole cover displacement and/or geysering. This work present results from ongoing experimental and numerical research on air pocket entrapment based on shear flow instabilities. A fully-filled horizontal water pipe is partially opened at the downstream end and create a cavity flow. After some advance within the pipe, a second valve is maneuver at the upstream end, enabling pressurized flows from the upstream end. The pipe-filling bore that is created pushes air in high velocity over the air cavity. In some cases, air pocket entrapment follows and lead to interesting peaks of pressure that seem to be a characteristic of this type of these entrapments. Future work will deepen our knowledge in air pocket entrapment through further CFD simulation and more experimental investigations.

Yasemin Eldayih, MS

Graduate Student
Auburn University

BS in Kocaeli University, Turkey, 2013. MSc Istanbul Technical University Department of Hydraulic, 2013. Awarded from Republic of Turkey General Directorate Of State Hydraulic Works - DSİ for graduate study in the US., 2014. Currently, MSc in Auburn University Civil Engineering Department. Areas: Computational Fluid Dynamics, OpenFOAM, Watershed Management, Storm Water Management, Transient Flow, Mixed Flow, Gravity Current, Air Pocket Entrapment.

Presentation(s):

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Jose Goes Vasconcelos, PhD

Associate Professor
Auburn University

PhD in Environmental Engineering - University of Michigan, 2005
MSc in Environmental Technology and Water Resources - University of Brasilia, 2000
BS in Civil Engineering - University of Brasilia, 1995
Currently Associate Professor at Auburn University
Member of Editorial Board of the ASCE Journal of Hydraulic Engineering and CHI Journal of Water Management and Modeling
Chair of the ASCE EWRI Hydraulic Structures Committee
Chair of the ASCE EWRI Task Committee in Two-Phase Flow In Urban Water Systems
Member of the ASCE EWRI Computational Hydraulics Committee
Advisor to the Engineers Without Borders Student Chapter at Auburn University

Presentation(s):

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