Air entrainment relationship with water discharge of vortex drop structures
Vortex drop shafts are used to transport water or wastewater from over-stressed existing sewer systems to underground tunnels. During the plunge a large amount of air is entrained into the water and released downstream of the drop shaft into the tunnel. This air is unwanted and becomes costly to tre...
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University of Iowa
2011
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ndltd-uiowa.edu-oai-ir.uiowa.edu-etd-24472019-10-13T04:53:19Z Air entrainment relationship with water discharge of vortex drop structures Pump, Cody N. Vortex drop shafts are used to transport water or wastewater from over-stressed existing sewer systems to underground tunnels. During the plunge a large amount of air is entrained into the water and released downstream of the drop shaft into the tunnel. This air is unwanted and becomes costly to treat and move back to the surface. Determining the amount of air that will be entrained is a difficult task. A common method is to build a scale model and measure the air discharge and scale it back to prototype. This study investigated a possible relationship between the geometry of the drop structure, the water discharge and the amount of air entrained. The results have shown that air entrainment is still not entirely understood, however we are close to a solution. Using a relationship of the air core diameter, drop shaft length and terminal velocity of the water, a likely exponential relationship has been developed. 2011-05-01T07:00:00Z thesis application/pdf https://ir.uiowa.edu/etd/1062 https://ir.uiowa.edu/cgi/viewcontent.cgi?article=2447&context=etd Copyright 2011 Cody N. Pump Theses and Dissertations eng University of IowaOdgaard, A. Jacob Air Entrainment Drop Shaft Drop Structure Scaling Vortex Civil and Environmental Engineering |
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English |
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Others
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Air Entrainment Drop Shaft Drop Structure Scaling Vortex Civil and Environmental Engineering |
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Air Entrainment Drop Shaft Drop Structure Scaling Vortex Civil and Environmental Engineering Pump, Cody N. Air entrainment relationship with water discharge of vortex drop structures |
description |
Vortex drop shafts are used to transport water or wastewater from over-stressed existing sewer systems to underground tunnels. During the plunge a large amount of air is entrained into the water and released downstream of the drop shaft into the tunnel. This air is unwanted and becomes costly to treat and move back to the surface. Determining the amount of air that will be entrained is a difficult task. A common method is to build a scale model and measure the air discharge and scale it back to prototype. This study investigated a possible relationship between the geometry of the drop structure, the water discharge and the amount of air entrained. The results have shown that air entrainment is still not entirely understood, however we are close to a solution. Using a relationship of the air core diameter, drop shaft length and terminal velocity of the water, a likely exponential relationship has been developed. |
author2 |
Odgaard, A. Jacob |
author_facet |
Odgaard, A. Jacob Pump, Cody N. |
author |
Pump, Cody N. |
author_sort |
Pump, Cody N. |
title |
Air entrainment relationship with water discharge of vortex drop structures |
title_short |
Air entrainment relationship with water discharge of vortex drop structures |
title_full |
Air entrainment relationship with water discharge of vortex drop structures |
title_fullStr |
Air entrainment relationship with water discharge of vortex drop structures |
title_full_unstemmed |
Air entrainment relationship with water discharge of vortex drop structures |
title_sort |
air entrainment relationship with water discharge of vortex drop structures |
publisher |
University of Iowa |
publishDate |
2011 |
url |
https://ir.uiowa.edu/etd/1062 https://ir.uiowa.edu/cgi/viewcontent.cgi?article=2447&context=etd |
work_keys_str_mv |
AT pumpcodyn airentrainmentrelationshipwithwaterdischargeofvortexdropstructures |
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