Computational fluid dynamics modelling of hydraulics and sedimentation in process reactors during aeration tank settling

Grey-box modelling of aeration tank settling.

A model of the concentrations of suspended solids (SS) in the aeration tanks and in the effluent from these during Aeration tank settling (ATS) operation is established. The model is based on simple SS mass balances, a model of the sludge settling and a simple model of how the SS concentration in the effluent from the aeration tanks depends on the actual concentrations in the tanks and the slud...

Modelling Sieve Tray Hydraulics Using Computational Fluid Dynamics

The ability of Computational Fluid Dynamics (CFD) to model the complex two-phase hydrodynamics of sieve trays is examined. The key to a proper description of the flow is the estimation of the momentum exchange, or drag, coefficient between the gas and liquid phases. In the absence of sound theoretical models, empirical correlations for the average gas fraction on the tray, such as those of Benn...

Modelling of UV disinfection reactors by means of Computational Fluid Dynamics

Nowadays, water disinfection with ultraviolet (UV) radiation becomes increasingly important. This work presents a simulation method to predict the disinfection efficacy of an UV disinfection reactor and compares the results to biodosimetric measurements. Computational Fluid Dynamics (CFD) calculations have been performed for a set of operation parameters. A discrete phase model was used to gene...

Computational Fluid Dynamics (CFD) Modeling of Photochemical Reactors

Computational fluid dynamics modelling in cardiovascular medicine

This paper reviews the methods, benefits and challenges associated with the adoption and translation of computational fluid dynamics (CFD) modelling within cardiovascular medicine. CFD, a specialist area of mathematics and a branch of fluid mechanics, is used routinely in a diverse range of safety-critical engineering systems, which increasingly is being applied to the cardiovascular system. By...