Abstract
In the present study, through Computational Fluid Dynamics techniques, the performance characterization of a new Stairmand-type separator cyclone was carried out using the commercial software ANSYS Fluent. Four models for the geometrical cyclone separator were built, namely model A as per the dimensions reported in the literature and models B, C, and D by applying square and circular shape cavities as a passive flow control technique on the surface of its cylindrical section. The Navier-Stokes equations with the RSM turbulence model were formulated to solve the continuous phase of the cyclone separator and, the Lagrangian approach was adopted to track the solid particles with one way-coupling. The proposed model’s separation efficiency and pressure drop were compared against those recorded in the previous studies reported in the literature. Model D was the cyclone separator that stood out as the most valuable by demonstrating a separation efficiency and pressure drop decrement of 0.42% and 6.01%, respectively.
Highlights
Air pollution is defined as the presence of gases and small particles in the air that are conducive to health risks of people and the environment [1]
Flow in the cyclones can be modeled by using commercial software, such as ANSYS Fluent [37], which has several turbulence models that go from the two equation models (k-ε standard and RNG) to the seven equations Reynolds Stress Model (RSM), and the large-scale model (LES)
The separation efficiency in a cyclone is the relationship between the number of ticles captured with regards to the number of particles that enter by its inlet section [ 80% This collection capacity is denoted in terms of its global efficiency or the cut-off diam (d50), the latter being the particle diameter whose separation efficiency is 50% [10]
Summary
Air pollution is defined as the presence of gases and small particles in the air that are conducive to health risks of people and the environment [1]. Cyclone separators are mechanical collectors whose primary function is to separate solid particles from a gas using centrifugal force [10] This particulate matter collection equipment is the most used device in all industrial areas (energy, chemical, and cement, among others) because its simple design is absent of moving parts, which results in low maintenance costs. Issues revolving around the separation efficiency and the pressure drop are the most important parameters to keep in mind during the design process of cyclone separators In such a case, there are different physical and geometrical variables that directly come into play in association with these two parameters that include the density of the particles, the viscosity of the gas, the geometrical dimensions of the cyclone, the cut-off diameter of the particles, the inlet velocity, etc. Throughout this research the Stairmand high-efficiency cyclone will be called Model A, while cyclone separator models based on flow control techniques will be called models B, C, and D, respectively
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