AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
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Evaluation of Particle Release Map using Selected Turbulence Models on the T Junction for Cohesive Wall Treatment
YUKI TSUZUKI, Ralph Aldredge, University of California, Davis
Abstract Number: 173 Working Group: Aerosol Physics
Abstract The purpose of this research is to evaluate the discrepancies in the fate of the particles using the particle release map (PRM) under the treatment of cohesive particle to wall treatment in the T junction pipe using three selected turbulence models: Launder-Sharma k-epsilon, k-omega SST, and SSG Reynolds Stress Model (RSM). The results obtained from the particle laden flow in branched pipe systems plays a key role in a gas pipeline system such as transferring aerosolized sealants for sealing leaks or sedimentation of non-cohesive particles in the branched pipes. Current research provides in-depth particle analysis using depositional velocity and concentrations of particles distribution; however, the consequences of particle transfer rates to branched system from various turbulence models is not clear. This research is going to utilize the selected turbulence models to analyze the particle response under the T-junction pipe systems.
In this paper, the CFD simulation is conducted using the open-source software OpenFOAM, using the Lagrangian particle method. Observing parameters are particle distribution, particle diameter and T junction location with all under cohesive particle-wall interactions. The post processing comparison of the particle distribution is analyzed using PRM, which provides the connection between pre-branched to post-branched particle profile.
The computational results comparing the turbulent kinetic energy (TKE) associated with three models show differences from the DNS, seen in Hedlund et al. [1], where the peak of the TKE at near the wall, and TKE at the centre of the pipe can differ up to ~90% and ~40% respectively. This discrepancy will directly influence the particle distribution and alter the particle entering the daughter branches. Further research will be directed toward conducting and analyzing the effect of these models on the T-Junction geometry using PRM.
[1] A. Hedlund. Evaluation of RANS turbulence models for the simulation of channel flow. Technical report. Uppsala Universitet, Department of Engineering Sciences, 2014.