In Fig. 6c and d removal efficiencies of 1 and 0.5m particles
are presented, respectively. In these curves by increasing the inlet
air flow rate, the removal efficiency falls down, afterwards it begins
growing again. This unexpected behavior might be due to the complex
hydrodynamics of the fine particles in the mixing chamber
of the scrubber. As afore mentioned, the particles in size range of
0.1–1m cannot leave the streamlines, and travel with air stream
adjacent to surface of droplets. Increasing of the inlet air flow rate
mayimprovethe interception mechanism. It seems that the particle
residence time and particle removal by the interceptionmechanism
are in competition with each other which lead to these curves. In
the other words, although the residence time becomes shorter by
increasing of the inlet air flow rate, but the improvement of the
turbulency (due to the higher air flow rate) in the mixing chamber,
deviates particles from their streamlines and force them to contact
with water droplets.
In Fig. 6c and d removal efficiencies of 1 and 0.5m particlesare presented, respectively. In these curves by increasing the inletair flow rate, the removal efficiency falls down, afterwards it beginsgrowing again. This unexpected behavior might be due to the complexhydrodynamics of the fine particles in the mixing chamberof the scrubber. As afore mentioned, the particles in size range of0.1–1m cannot leave the streamlines, and travel with air streamadjacent to surface of droplets. Increasing of the inlet air flow ratemayimprovethe interception mechanism. It seems that the particleresidence time and particle removal by the interceptionmechanismare in competition with each other which lead to these curves. Inthe other words, although the residence time becomes shorter byincreasing of the inlet air flow rate, but the improvement of theturbulency (due to the higher air flow rate) in the mixing chamber,deviates particles from their streamlines and force them to contactwith water droplets.
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