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    process originating from large eddies. The presence of uniform
    structure helps to maintain similarity in the flow throughout thus
    making the energy distribution uniform. Moreover, since there
    are no fluid sweeping blades, the formation of large eddies is
    avoided, and the impeller basically cuts the fluid continuously.
    This practically eliminates the typical energy dissipation and
    shear zones observed in conventional impellers. Also, the ab-
    sence of any wakes behind the blades helps further reduce the
    drag and hence the energy consumption. Reduction in the
    contact area of the impeller also helps to decrease the extent of
    form and skin drag. The design yields stream lines that would
    follow the flow separation over the blades and interaction with
    other streamlines in the compartments formed due to self-similar
    feature. This specifically reduces the value of form drag to a great
    extent, and also the possibility of any wake formation behind the
    blade is almost zero. However, continuous passage of blades in
    the same plane helps develop local circulation zones restricted to
    the blade dimensions thereby creating several similar local
    circulating zones that interact with each others. More detailed
    work on flow visualization of the zones and the interacting
    circulation zones is in progress. Different design alternatives
    with varied blade angles, etc. may yield better flow, and more
    efforts on understanding the effect of design of the FI on the
    performance are under investigation. To further characterize the7670 7667–7676
    performance of FI, we studied the liquidsolid suspension,
    gasliquid dispersion, and the mixing time.
    3.2. Suspension. Usually, the flow pattern from an axial flow
    impeller is conducive to easier suspension than that of by a radial
    flow impeller, while the mixed flow impellers show an inter-
    mediate performance. Suspension of solids in liquid in a stirred
    tank reactor has been studied over many decades, and certain
    guidelines on the selection of suitable impeller is known.
    68
    Typically weak recirculation induced loops occur just below the
    impeller and also at the junction of the tank base and the wall. For
    the case of the impeller operating close to the tank base, the
    efficiency of energy transfer from impeller to particles is max-
    imum. The particulate mass trapped in the stagnant zone below
    the impeller is, therefore, easily driven to the corners with enough
    velocity to get suspended. If the off-bottom clearance of the
    impeller is increased, then the stagnant zone below the impeller
    also increases and more particles get accumulated there. In such
    cases, higher impeller rotation speed would be needed to lift the
    particles from the bottom and then get completely suspended at
    further greater impeller rotation speeds.
    The flow generated by the FI is largely a tangential flow as all
    the blades simply cut the fluid in different planes thereby
    avoiding any possibility of sweeping or pushing the fluid in its
    path. Thus, the flow separation over the blades is a prominent
    phenomena, and the fluid interacting with different rotating
    zones mix with each other. This results in a strong tangential
    flow at the bottom of the impeller, and thus helps to lift the
    particles while pushing them toward the wall; however, once
    these particles are lifted, they are trapped in the rotating structure
    which keeps the particle floating between different zones. Also,
    the velocity gradients in the vicinity of the blade were seen to help
    get the particles lifted in the direction perpendicular to the
    motion of the blade. For different suspension densities of the
    resin particles (as mentioned in section 2), the value of PW was
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