EPTT 2022

13th Spring School on Transition and Turbulence

LES SIMULATION OF A WAVE-PLATE DEMISTER

Submission Author: Vinícius Basso de Godoy , SC
Co-Authors: Vinícius Basso de Godoy, Bárbara Braatz Vetter, Joseph Meyer, Jonathan Utzig, Henry França Meier
Presenter: Vinícius Basso de Godoy

doi://10.26678/ABCM.EPTT2022.EPT22-0073

 

Abstract

The mist elimination process is commonly used in many industrial sectors such as chemical, oil and gas, desalination, and mining industry. The equipment known as demister or mist eliminator is designed to remove liquid droplets from a gas stream by performing an intervention on the force balance of the drops. For the design and study of demisters, Computational Fluid Dynamics (CFD) is a valuable tool to predict the equipment behavior with relatively low cost. Effort has been made to numerically solve for separation efficiency using predominantly Reynolds Averaged Numerical Simulation (RANS) approach, whereas few studies considered LES on their analysis. Thus, the objective of this work is to analyze the performance of a wave-plate demister using LES approach rather than RANS by determining the separation efficiency of the equipment at different gas velocities and liquid volume fraction. To achieve this objective, numerical simulations will be performed by using the Eulerian-Lagrangian method for the two-phase flow considering the WALE turbulence model for the LES sub-grid scales. The demister performance is evaluated by means of separation efficiency. Results show that the demister used in this study works at best with higher concentration of droplets around 10% of volume fraction and at medium air velocities around 3.5 m/s, reaching a number separation efficiency of 99.11%. Additionally, the mesh quality analysis proved to be an easy method to conduct in a LES simulation.

Keywords

Computational fluid dynamics (CFD), mist elimination, Large Eddy Simulation (LES), Turbulent kinetic energy

 

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