Reactor Geometry 4 Diameter of the reactor T = 50.0 4 Height of the cylindrical portion H = 80.0 4 Z = 70.0 Total Volume of the reactor V = 2.8 m3 1 Select the type of Agitator Pitched Blade Turbine 4 D/T Ratio 0.5 Agitator rpm N = 110 rpm Fluid Properties Density ρ = 1100 kg/m3 Viscosity µ = 100 cp Calculation 1) Reynolds Number Diameter of the agitator D = 0.6 m Reynolds Number Re = 8132 2)Power Requirement Power Number Np = 1.37 Power Required P = 1.61 hp (Assuming 80% Loading) 3) Mixing Intensity Pumping Number Nq = 0.6 Equivalent Diameter Teq = 5.00 ft Volumetric flow rate Q = 9.9 ft3/sec Cross sectional area A = 13.6 ft2 Velocity V = 0.729 ft/sec Liquid level height in the reactor from bottom
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Agitator Power Requirement and Mixing Intensity Calculation
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Reactor Geometry
4 Diameter of the reactor T = 50.0
4 Height of the cylindrical portion H = 80.0
4 Liquid level height in the reactor from bottom Z = 70.0
Total Volume of the reactor V = 2.8 m3
1 Select the type of Agitator Pitched Blade Turbine
4 D/T Ratio 0.5
Agitator rpm N = 110 rpm
Fluid Properties
Density ρ = 1100 kg/m3Viscosity µ = 100 cp
Calculation
1) Reynolds Number
Diameter of the agitator D = 0.6 m
Reynolds Number Re = 8132
2)Power Requirement
Power Number Np = 1.37
Power Required P = 1.61 hp(Assuming 80% Loading)
3) Mixing Intensity
Pumping Number Nq = 0.6
Equivalent Diameter Teq = 5.00 ft
Volumetric flow rate Q = 9.9 ft3/sec
Cross sectional area A = 13.6 ft2
Velocity V = 0.729 ft/sec
Select the value from Power number chart based on Reynolds number
Use 5.5 for Rushton six blade turbine & 3.2 for concave 180 degree turbine
Select the value from Pumping number chart based on Reynolds number
Use 0.72 for Rushton six blade turbine & 0.7 for concave 180 degree turbine
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4) Agitator requiredNo of Agitators Required = 2Z/T = 1.40