4.1 Differentiate between mixing and agitation 4.2 State FOUR purposes of agitation 4.3 A disc turbine with six flat blades is installed centrally in a vertical baffled tank with a diameter of 2 metres. The turbine is 0.67 metres in diameter and is positioned 0.67 metres above the bottom of the tark. The turbine blades are 134mm wide. The tank is

Question

4.1 Differentiate between mixing and agitation 4.2 State FOUR purposes of agitation 4.3 A disc turbine with six flat blades is installed centrally in a vertical baffled tank with a diameter of 2 metres. The turbine is 0.67 metres in diameter and is positioned 0.67 metres above the bottom of the tark. The turbine blades are

134mm

wide. The tank is filled to a depth of 2 metres with an aqueous solution of

50%NaOH

at

65\deg C

, which has a viscosity of

12cP

and a density of

1500k(g)/(m^(3))

. The turbine impeller turns at

90rpm

. 4.3.1 What is the power required? 4.3.2 The agitation system in (a) is to be used to mix a rubber-latex compound having a viscosity of 120 Pas and a density of

1120k(g)/(m^(3))

. What power will be required? Will this power requirement change if the tank was baffled? Is there a need for baffles?

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