An Application of Computational Fluid Dynamics to Optimize Municipal Sewage Networks; A Case of Tororo Municipality, Eastern Uganda.

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).

Application of Computational Fluid Dynamics in Simulation and Optimization of a Fluidized Sugar Bed Dryer

“…Hence, its application and simulation use cannot be overemphasised especially in the drying processes. The use of CFD in numerical analysis has shown good results in solving problems of fluid flow with heat and mass transfer, [10] and this has attracted many researchers due to its industrial, environmental, and scientific applications, [11], [12], [13], [14], [15], [16], [17], [18]. [19], analyzed the process of using CFD modeling with the developed threedimensional FBD model while, [20], studied a bubbling flow in a 2D pulsed fluidized bed dryer using the Eulerian approach, and their results showed that pressure changes inside the bed, was due to the formation of air bubbles at minimal frequency pulsating inlet flow causing intermittent fluidized state.…”

A Mathematical Model on Linkage Leakage in Sewage Pipes Laid in a Porous Ground Using Computation Fluid Dynamics.

“…The pipeline system is one of the most commonly used methods of fluid transportation all over the world. Research on urban sewer pipelines focuses on hydraulics such as pipe slopes and flow rate so that sewage and faecal sludge are to be delivered efficiently (Semwogerere et al, 2020). The flows at the proximity of these structures are typically highly turbulent and often characterized by changes between the open channel and pressurized conditions.…”