Problem 4 (Problem 6.9-Textbook) Design a vertical turbine flocculator to treat 75,700 m³/d of water per day at a detention time of 30 minutes. Use three parallel treatment trains with four compartments per train. The temperature of the water is 20°C, resulting in values of 1.002 x 103 kg/(m·s) and 998.2 kg/m³ for μ and p, respectively. The impeller diameter (D) to effective tank diameter (Te) ratio is 0.4. Assume a power number (Np) of 0.25 for a three-pitch blade with camber, and a mean velocity gradient of 70 s¹. Determine the following: a. Dimensions of each compartment assuming they are cubes (m). b. Impeller diameter (m). c. Power input per compartment (W). d. Rotational speed of each turbine (rpm).
Problem 4 (Problem 6.9-Textbook) Design a vertical turbine flocculator to treat 75,700 m³/d of water per day at a detention time of 30 minutes. Use three parallel treatment trains with four compartments per train. The temperature of the water is 20°C, resulting in values of 1.002 x 103 kg/(m·s) and 998.2 kg/m³ for μ and p, respectively. The impeller diameter (D) to effective tank diameter (Te) ratio is 0.4. Assume a power number (Np) of 0.25 for a three-pitch blade with camber, and a mean velocity gradient of 70 s¹. Determine the following: a. Dimensions of each compartment assuming they are cubes (m). b. Impeller diameter (m). c. Power input per compartment (W). d. Rotational speed of each turbine (rpm).
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Transcribed Image Text:Problem 4 (Problem 6.9-Textbook)
Design a vertical turbine flocculator to treat 75,700 m³/d of water per day at a detention time of
30 minutes. Use three parallel treatment trains with four compartments per train. The
temperature of the water is 20°C, resulting in values of 1.002 x 103 kg/(m·s) and 998.2 kg/m³
for μ and p, respectively. The impeller diameter (D) to effective tank diameter (Te) ratio is 0.4.
Assume a power number (Np) of 0.25 for a three-pitch blade with camber, and a mean velocity
gradient of 70 s¹. Determine the following:
a. Dimensions of each compartment assuming they are cubes (m).
b. Impeller diameter (m).
c. Power input per compartment (W).
d. Rotational speed of each turbine (rpm).
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