Browse
Recent Submissions
Item To investigate near wall effects of UV water disinfection reactor using CFD(UMT, Lahore, 2019) Muhammad YasirMany improvements have been presented on the Ultra-violet (UV) disinfection reactor geometry in which lamp configuration, wall roughness and hydrodynamics were the main focus of the research. The turbulence of the fluid flow is significantly influenced by the presence of the wall, since it is modified by the nearness of the wall in a non-minor way. Unfortunately, no single model of turbulence is available that could deal the complexity of the fluid flow on the wall. Wall function is the pivotal to control the turbulence on the wall, different functions available which control the individual layer of the wall region. In our study we have used different wall function numerical approaches of the computational fluid dynamics (CFD) to study the effects of fluent turbulence on the reduction equivalent dose (RED) in the UV disinfection Reactor Model. For our turbulence model we used K-elipson to calculate RED under different wall functions (standard, scalable, non-equilibrium, enhanced wall treatment). Discrete ordinates radiation model was used and simulated for the UV lamp inside the reactor chamber, which has been ended up being a solid instrument for fluence rate (FR) displaying circulations in our UV reactor. Onwards critical parameter of wall functions was highlighted. We have investigated near wall effects of water disinfection and calculated the RED on each wall function with variable pathogen velocities. The simulation results provide the valuable understanding about how the RED differ or remains same between wall functions of single annular water disinfection reactor.