Simulation of an orifice scrubber performance based on Eulerian/Lagrangian method

CFD modeling of droplet dispersion in a Venturi scrubber

“…The characteristic velocity u can be considered equal to square root of turbulence kinetic energy, k. The characteristic length, l, can be defined in terms of turbulence characteristics [14] as follows:…”

“…The value of c 1 usually was determined by fitting with experimental data [14]. Rosin-Rammler function was applied for considering the size distribution of droplets according to Fernandez Alonso et al study [15]:…”

Improvement of Centrifugal Wet Scrubber Design Through Laboratory Experimentation and Computational Fluid Dynamics

“…Yung et al (1978) used it, along with the Nukiyama & Tanasawa relation (1938) for mean droplet size, to estimate the collection efficiency inside the venturi throat. It was also used by Viswanathan & Amanthanarayanan (1998) to predict the scrubbing efficiency of venturi scrubbers and by Mohebbi et al (2003) for an orifice scrubber, since the major collection mechanism is similar for both the scrubber types. However, since venturi scrubbers are often employed in industries where the dust particle size is much smaller than that required for inertial impaction to occur, other mechanisms such as diffusion should also be taken into account for better estimation of their collection efficiency.…”

“…For many industrial problems, the standard k− model generates acceptable results but modelling predictions deviate from experimental measurements when the flow is highly swirling, since standard k− model assumes isotropic eddy-viscosity, whereas when the flow is swirling, the eddyviscosity is anisotropic. Mohebbi et al (2003) used the standard k-model to predict the pressure drop across an orifice scrubber, concluding that the collection efficiency increased with increasing inlet velocity. In another published research (Mohebbi et al, 2002), they discussed typically employed boundary conditions using the standard k-model when no experimental boundary conditions are available, and validated the results by comparison to the experimental data of Taheri et al (1973).…”

“…The application of the Stokes number approach to calculate the collection efficiency is much more realistic in such cases. Mohebbi et al (2003) used this parameter for the CFD modelling of an orifice scrubber, using the Eulerian-Lagrangian approach. The collection efficiency was then calculated using a modified correlation, which was based on a least square curve fit of the original experimental data of Walton and Woolcock (1960).…”