<Motor power>
P / V = Stirrer motor power [kW] / Stirring capacity [m3]
It is the value of the agitator motor power per unit agitation capacity, _and is used to roughly determine the agitation intensity.
In simple liquid-liquid stirring, P / V = about 0.2. For weak agitation such as aggregation, P / V = 0.1 to 0.15.
Increase the P / V when the polymer is highly dissolved _or viscous, _or when strong stirring is desired.
* The above is for reference only because the stirring capacity differs depending on the purpose of stirring, the stirring capacity, the blade diameter, the number of blade stages, _and the number of rotations.
If the P / V is small, sufficient stirring strength cannot be obtained, _and if the P / V is too large, the stirring strength becomes too strong _and causes problems such as shaft runout. Therefore, check the usage conditions, stirring purpose, etc. _and select an appropriate one. You need to do.

<Theoretical discharge amount>
① Q / V = theoretical discharge rate [m3 / min] / stirring capacity [m3]
② [Q / V] ・ t = Theoretical circulation number per unit time [min-1] × Resident time [min]
① is the number of theoretical circulations per unit time, _and ② is the number of theoretical circulations within the residence time, which is used to determine the stirring capacity.
In simple liquid-liquid stirring, Q / V = 1 to 1.5.
* Q / V tends to decrease as the stirring capacity increases, so it cannot be said unconditionally.
Standardly [Q / V] ・ t = 15 to 20.
* Since it is proportional to the cube of the blade diameter, the discharge amount tends to increase when the rotation speed is lowered _and the blade diameter is increased even with the same power.
As with P / V, if the Q / V is too small, sufficient stirring strength cannot be obtained, _and if it is too large, the stirring strength becomes too strong _and causes problems such as shaft runout. Therefore, check the usage conditions _and stirring purpose. It is necessary to make an appropriate selection.

<Blade tip speed [peripheral speed]>
Blade tip speed [m / s] = pi x blade diameter [m] x rotation speed [s-1]
The speed at the tip of the stirring blade is used to check the shear capacity [prevention of flock breakage, etc.] _and to judge whether _or not slipping is possible, _and there is an appropriate range depending on the blade shape.
Although it depends on the liquid properties _and the chemicals used, the blade tip speed is about 2 m / s for floc formation.
Even when idling, the blade tip speed should be about 2 m / s _or less, _and the number of blades should be 3 to 4 pitched paddles to improve stability.
If the blade tip speed is too low, a sufficient stirring effect cannot be obtained, _and if it is too high, the flocs may be destroyed _or problems such as shaft bending may occur when idling.