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Numerical Simulation of Aerocyclone Performance and Effect of Body Profile
Salehi, Masood | 2014
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 46250 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): moosavi, Ali; noori brojerdi, Ali
- Abstract:
- A gas cyclone is a fixed mechanical device that uses centrifugal force to separate solid particles from gas. Gas containing particles is brought tangentially into the cyclone. This results in the development of a vortex, which applies strong centrifugal forces to the particles. The larger particles move toward the outer wall of the system as a result of centrifugal forces. gases spiral down from a tangential inlet towards the conical section, where the flow is reversed and the particles are collected in a hopper. The gas phase then proceeds upward in an inner vortex towards the gas exit via the vortex finder.
In this study swirling flow of two-phase gas-solid in cyclone separator is simulated. The numerical simulations of cyclone flow were carried out by solving the three-dimensional Reynolds averaged Navier-Stokes (RANS) equations combined with Reynolds stress turbulence model (RSM). The Euler Lagrangian method was used to track the particle motion and calculate the cyclone efficiency. The Fluent software version 12 was used for the CFD simulations and Gambit for mesh generation. Using the experimental data available in the literature, simulation is verified and performance of cyclone is studied in terms of pressure loss and collection efficiency.
Then the effect of vortex finder length on the performance and flow field pattern has been investigated. Results show that effect of vortex finder length is not significant and flow field pattern is similar for cyclones with different vortex finder length. Also effect of cone height is considered. Tangential velocity increases by increasing cone height resulting in more pressure loss. Increasing the cone height separation efficiency also increased about 5 percent.
In the end effect of body profile on flow pattern and separation efficiency is studied for four cyclones. Results show 8 percent increase in separation efficiency for p1 cyclone - Keywords:
- Gas Cyclone ; Computational Fluid Dynamics (CFD) ; Turbulent Swirling Flow ; Discrete Particle Model (DPM) ; Simulation ; Optimization
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