A 25-mgd water treatment plant has a flocculation tank 64 ft long and 100 ft wide with a water depth of 16 ft. The four horizontal shafts of paddle flocculators are in compartments separated by baffles. All the paddle units have four arms with three blades each with radius of 3.0, 4.5, and 6.0 ft measuring from the shaft to the center of the 0.80 ft-wide boards. The total length of the paddle boards across the tank is 50 ft. Assume a ratio of water velocity to paddle velocity of 0.3, rotational speed of 0.050 rev/sec, Ca = 1.8, and water temperature of 50°F. Calculate the velocity gradient. Given: p = 1.936 lb.sec/ft and u = 2.735 x 105 lb.sec/ft?
A 25-mgd water treatment plant has a flocculation tank 64 ft long and 100 ft wide with a water depth of 16 ft. The four horizontal shafts of paddle flocculators are in compartments separated by baffles. All the paddle units have four arms with three blades each with radius of 3.0, 4.5, and 6.0 ft measuring from the shaft to the center of the 0.80 ft-wide boards. The total length of the paddle boards across the tank is 50 ft. Assume a ratio of water velocity to paddle velocity of 0.3, rotational speed of 0.050 rev/sec, Ca = 1.8, and water temperature of 50°F. Calculate the velocity gradient. Given: p = 1.936 lb.sec/ft and u = 2.735 x 105 lb.sec/ft?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A 25-mgd water treatment plant has a flocculation tank 64 ft long and 100 ft wide with a water
depth of 16 ft. The four horizontal shafts of paddle flocculators are in compartments separated by
baffles. All the paddle units have four arms with three blades each with radius of 3.0, 4.5, and 6.0
ft measuring from the shaft to the center of the 0.80 ft-wide boards. The total length of the paddle
boards across the tank is 50 ft. Assume a ratio of water velocity to paddle velocity of 0.3,
rotational speed of 0.050 rev/sec, Ca = 1.8, and water temperature of 50°F.
Calculate the velocity gradient.
Given: p = 1.936 lb.sec/ft* and u = 2.735 x 10* lb.sec/ft?
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