Blade—The impeller element in a paddle wheel.

Brake or shaft power—The power given to the shaft by a prime mover. Flocculation—A unit operation aimed at enlarging small particles through a very slow agitation of the water suspending the particles. Fluid filament—A volume of fluid composed of several parcels. Fluid parcel—A volume of fluid composed of several molecules.

Gradient of velocity—The rate of change of velocity with respect to displacement.

Hydraulic mixers—Mixers that utilize, for the mixing process, the agitation that results in the flowing of the water.

Mixing—A unit operation that distributes the components of two or more materials among the materials producing in the end a single blend of the components.

Paddles—Impellers in which the lengths are equal to 50 to 80% of the inside diameter of the vessel in which the mixing is taking place.

Paddle arm—The element extending from the axis of rotation in a paddle wheel.

Paddle wheel—The paddle configuration in a flocculator compartment.

Pitch—Assuming no slippage, the ratio of the distance traveled by the water to the diameter of the impeller.

Pneumatic mixers—Mixers that uses gas or air bubbles to induce the agitation.

Power dissipation—In fluid motion, power lost due to frictional resistance and is equal to the power given by the agitator.

Propellers—Impellers in which the direction of the driven fluid is along the axis of rotation.

Reference dimension—The smallest number of groups of the groups formed from all the possible groupings of the basic dimensions of the physical variables in a given problem.

Rotational mixers—Mixers that use a rotating element to effect the agitation.

Shape factors—The normalized distance measurements in a body to one arbitrarily chosen reference distance in the body.

Slat—Same as paddle blade.

Square pitch—A pitch in which the axial distance traversed is equal to the diameter of the propeller.

Turbines—Impellers shorter than paddles and are only about 30 to 50% of the inside diameter of the vessel in which the mixing is taking place.

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