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RISFlow Regimes in a Dropshaft with Limited Air Supply
Publisher: American Society of Civil Engineers
Abstract: A physical model study was conducted to investigate the flow regimes in a plunging-type dropshaft under the conditions of no air supply and limited air supply. When the top of the dropshaft is sealed, three flow regimes ...
Unveiling the Impacts of China’s Carbon Reduction Policies on Emerging Air Pollutants under Technological Uncertainties
Publisher: American Society of Civil Engineers
Abstract: AbstractChina’s ambitious carbon mitigation targets, aimed at achieving peak CO2 emissions by 2030 and carbon neutrality by 2060, not only contribute to global climate
efforts but also yield significant air pollution ...
Erosion of Sand Beds with Translating Circular Turbulent Jets
Publisher: American Society of Civil Engineers
Abstract: AbstractLaboratory experiments were conducted to investigate the erosion of a sand bed by
a submerged translating circular jet. Deformation of the sand bed can be classified
as dynamic scour and static scour (after the jet ...
Unsteady Air Flow Induced by Pumping Events in Sewer Systems
Publisher: American Society of Civil Engineers
Abstract: AbstractPumping events can cause air pressure fluctuations in sanitary sewers and lead to
air ventilation through openings. In this study, field measurement of air flow was
conducted in a sewer system downstream of a pump ...
Experimental and Numerical Investigations on Withdrawal of Water-Capped Viscoplastic Fluid
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Withdrawal of water-capped viscoplastic fluid was investigated using laboratory experimentation and numerical modeling. The viscoplastic fluid was modeled using a Laponite suspension, which was withdrawn by a vertical pipe ...
Air Flow Modeling in a Prototype Sanitary Sewer System
Publisher: American Society of Civil Engineers
Abstract: Modeling air movement in sewer systems is important because of its importance in addressing sewer odor issues and pipe corrosion. In this study, a steady-state model was developed for simulating the air pressure and movement ...
Experimental Study of Plunging-Flow Dropshafts with an Internal Divider for Air Circulation
Publisher: American Society of Civil Engineers
Abstract: Plunging-flow dropshafts can entrain a large amount of air into sewer systems, pressurize downstream airspace, and cause potential sewer odor issues. In this study, a new design for a plunging-flow dropshaft is investigated ...
Analytical Solution for Steady-State Groundwater Inflow into a Circular Tunnel in Anisotropic Soils
Publisher: American Society of Civil Engineers
Abstract: An analytical solution for groundwater flow through a circular tunnel in anisotropic soils is derived based on conformal mapping and can be used to calculate the water flow rate into the tunnel and predict the pore water ...
Air–Water Flows in a Deep Tunnel Downstream of a Dropshaft
Publisher: American Society of Civil Engineers
Abstract: AbstractDropshafts of deep tunnel systems can entrain a large amount of air, and the resulting
air–water interactions cause potential safety issues. In this study, the air–water
flow characteristics along a tunnel under ...
Effects of Drop Structures and Pump Station on Sewer Air Pressure and Hydrogen Sulfide: Field Investigation
Publisher: American Society of Civil Engineers
Abstract: Understanding hydrogen sulfide (H2S) emission into sewer air space and the rate of ventilation to the atmosphere is important in preventing/mitigating odor and corrosion problems in sewer systems. This study presents the ...