Abstract
Venturi scrubbers are usually used for large particles cleaning in turbulent gaseous flow. In this work, submicron particles scrubbing in laminar forced convection dusty air flow in a rectangular venturi scrubber have been numerically simulated. Hydrodynamics effects and scrubbing process are investigated in detail. Results are presented as flow velocity, axial pressure, streamlines pattern, particles and droplets mass fraction profile, and collect efficiency. They show that venturi scrubbers can be efficient for submicron particles scrubbing. In fact, a better collect efficiency is obtained at high particles-droplets residence time, high ratio droplets concentration/particles concentration, low venturi diameter ratioand low Reynolds numbers. There is a critical Reynolds number value for which the collect efficiency becomes very low and tends to be constant.
Highlights
Venturi scrubbers are widely used for particles and gaseous collection from industrial exhaust
In dusty gas scrubbing process by droplets in wet scrubbers, large particles are principally collected by inertial impaction [2]
Basing on the inertial impaction hypothesis, they have shown that the collect efficiency is depending on gas liquid ratio, venturi geometry, particles and droplets size; And large particles lead to a better collect efficiency
Summary
Venturi scrubbers are widely used for particles and gaseous collection from industrial exhaust. In dusty gas scrubbing process by droplets in wet scrubbers, large particles are principally collected by inertial impaction [2]. Their large inertia allows them to leave the gas streamlines to impact onto water drops. This type of venturi is recommended for hot gas flow, adhesives and corrosives dust [9]-[11] They have shown that the fraction of liquid streaming as a film influences the collect efficiency and the pressure drop across the device. Despite their dangerousness for human health [13] [14], submicron particles have not been received much attention in venturi scrubbing process In these studies cited above, only large particles are considered and the collect hypothesis is only based on inertial impaction. Diffusive effects have been neglected in venturi scrubbing process
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