Using the agitator-tank system described in curve 1 of Figure 20.28, calculate the speed for an agitator that imparts 0.01 hp/cu ft of tank contents in which the fluid under test is water at 70 degrees Fahrenheit, and the tank holds 50 cubic feet. For the system, z1/D' = 3.0. Calculate the power required for a 10 cubic foot tank at the same Reynolds Number. 

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PR N(D)5 No= 888 100, 80 60 40 20 1.2.3 10 1 0.8 0.6 0.4 0.2 0.1 4 Type of Impeller Marine propellers, 3 blades, pitch = 2D Same as #1 but pitch 1.05D Same as #1 but pitch 1.04 D' Same as #1 but pitch - D' 10 Froude function unnecessary 100 3.3 2.7 4.5 3 2₁ 2.7-3.9 0.75-1.3 2.7-3.9 2.7-3.9 0.75-1.3 2.3 Figure 20.28. Plot of Nro or No/N-108 2₁ D' 1000 a 2.7-3.9 0.75-1.3 2.1 No(D)² D'= impeller diameter D₁ = tank diameter z, elevation of impeller ₁ = elevation of liquid 1.7 0.75-1.3 0 b No. 18 1 18 2 18 3 18 4 10,000 100,000 Include Froude function as a function of Nae for unbaffled tanks (8). 1,000,000 PR N(D)5 No= 888 100, 80 60 40 20 1.2.3 10 1 0.8 0.6 0.4 0.2 0.1 4 Type of Impeller Marine propellers, 3 blades, pitch = 2D Same as #1 but pitch 1.05D Same as #1 but pitch 1.04 D' Same as #1 but pitch - D' 10 Froude function unnecessary 100 3.3 2.7 4.5 3 2₁ 2.7-3.9 0.75-1.3 2.7-3.9 2.7-3.9 0.75-1.3 2.3 Figure 20.28. Plot of Nro or No/N-108 2₁ D' 1000 a 2.7-3.9 0.75-1.3 2.1 No(D)² D'= impeller diameter D₁ = tank diameter z, elevation of impeller ₁ = elevation of liquid 1.7 0.75-1.3 0 b No. 18 1 18 2 18 3 18 4 10,000 100,000 Include Froude function as a function of Nae for unbaffled tanks (8). 1,000,000

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