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Abstract
Two-phase pipe flow is a common occurrence in many industrial applications such as sewage, water, oil, and gas transportation. Accurate prediction of liquid velocity, holdup and pressure drop is of vast importance to ensure effective design and operation of fluid transport systems. This paper aimed at the simulation of a two-phase flow of air and sewage (water) using an open source software OpenFOAM. Numerical Simulations have been performed using varying dimensions of pipes as well as their inclinations. Specifically, a Standard k- turbulence model and the Volume of Fluid (VOF) free water surface model is used to solve the turbulent mixture flow of air and sewage (water). A two dimensional, 0.5m diameter pipe of 20m length is used for the CFD approach based on the Navier-Stokes equations. Results showed that the flow pattern behaviour is influenced by the pipe diameters as well as their inclination. It is concluded that the most effective way to optimize a sewer network system for Tororo Municipality conditions and other similar situations, is by adjusting sewer diameters and slope gradients and expanding the number of sewer network connections of household and industries from 535 (i.e., 31.2% of total) to at least 1,200 (70% of total).
Highlights
In urban development history, Municipal Sewage systems were built to collect rain runoff, wastewater, and sewage rapidly
Research on urban drainage pipelines focuses on hydraulics such as pipe slopes and flow rate so that sewage and faecal sludge are to be delivered efficiently [2]
The main design challenge of the network structure is the allowance of overflows only after underdrain capacity is exceeded while minimizing head losses that reduce the underdrain flow capacity
Summary
Municipal Sewage systems were built to collect rain runoff, wastewater, and sewage rapidly These networks consist of pipes, pumping stations, force mains, manholes, and other facilities required to collect and transport wastewater [1]. The flows at or in the proximity of these structures are typically highly turbulent and often characterized by changes between the open channel (free surface) and pressurized conditions [3]. Such turbulent flows frequently involve complex interactions between air and water [4] as in the case of manholes with multiple in/out pipes, stepped spillways, and flow network structures. A second challenge is the prevention of significant backwater effects
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