CFD‐Modellrechnungen zum Auftreffgrad von Partikeln auf Tropfen

For wet scrubber simulation the knowledge of collision efficiencies of particles with droplets is needed with high resolution and in a wide range of droplet Reynolds numbers. CDF simulations enabled the calculation of collision efficiencies as a function of droplet Reynolds numbers in high resolution. For every droplet Reynolds number between 0.1 and 100 the Stokes‐Number was varied via the particle diameter, whose ratio to the droplet diameter was always smaller than 0.15. The calculated collision efficiencies presented here to some extend differ distinctively from the results known from the literature.     

Simulation komplexer fluider Transportvorgänge in der Verfahrenstechnik

Simulation of Complex Liquid Transport Processes in Chemical Engineering The numerical calculation of flows has become a universal tool in several scientific and technical applications to be able to better understand or control the transport processes in fluids. Still, in many areas of chemical engineering technology the use of numerical simulations is less developed. One of the reasons for this is the low reliability and efficiency of standard CFD techniques. How can simulation methods in combination with alternative grid generation techniques be used to generate reliable predictions of the operation behavior relation of components in the chemical industry? A new way is demonstrated here, whereby the described calculation techniques are based on one of the most rigorous models of the transport processes of fluids, namely the Boltzmann equation.     

CFD‐Simulation zur Berechnung der durch Gewebestrukturen induzierten Strömungsfelder mithilfe der Immersed‐boundary‐Methode

Woven structures are often used for separation of solid particles. The solid phase is separated when the fluid flows through the woven structure. Knowing the nature of the flow can be profitably used for the optimization of these structures (e.g., reduction of the pressure loss) and to predict the separation efficiency. In general, computational fluid dynamics allows the calculation of the flow field. In this paper, the immersed boundary method is shown as an efficient way to simulate the flow field within woven structures and reduce modeling efforts compared to the standard CFD method.     

Numerische Simulation disperser Gas/Flüssig‐Strömungen in Blasensäulen bei hohen Gasgehalten mit OpenFOAM® Teil 1 – Grundlagen der Modellierung

Various chemical products are synthesized in processes using gas/liquid reactors with bubbly flows. Hence, there is significant interest in a more efficient process design as well as in process intensification with a strong focus on this reactor class. However, the design of industrial gas/liquid reactors requires more detailed information about the flow structures and characteristics of two‐ or multiphase systems. The basic models for two‐fluid model simulations of dispersed gas/liquid flows in bubble columns at high gas fractions are presented..     

CFD‐Simulation und LDA‐Messung der Strömungsvorgänge beim Fluidphasenresonanzmischen

The principle of fluid phase resonance mixing is to apply harmonic oscillating pressure via a gas cushion on a liquid phase in a vessel and thus to cause the liquid phase to start oscillating. This principle is simulated as an unsteady flow of two separate phases with open source CFD software OpenFOAM and the results are verified with measurements by Laser Doppler Anemometry.     

Numerische Simulation disperser Gas/Flüssig‐Strömungen in Blasensäulen bei hohen Gasgehalten mit OpenFOAM®. Teil 2 – Numerische Simulation und Ergebnisse

The design of industrial gas/liquid reactors such as bubble columns requires detailed information with respect to the flow structure and characteristics of two‐ or multiphase systems in the reactor. The contribution is focused on the evaluation of the simulation results obtained by a selection of models. The results are further compared with those reported in literature. The simulations have been performed with the CFD software OpenFOAM®. The main focus of the numerical simulation was set on capturing the characteristic process and design parameters of bubble columns.