Determine the required width of the paddle blade and recommend a motor power (W) and rotational speed (rpm) for the horizontal shaft of a cross-flow paddle flocculator for the first compartment of a three-compartment flocculation basin shown in the figure below. (Note: There are three paddle wheels on each shaft.) The following assumptions are to be used in the design: Liquid volume = 257.2 m3 Velocity gradient = 40 s-1 Motor efficiency = 80% Paddle velocity relative to water = 0.5 m/s Water temperature = 15 C Drag coefficient = 1.8 No vertical baffles are present
Determine the required width of the paddle blade and recommend a motor power (W) and rotational speed (rpm) for the horizontal shaft of a cross-flow paddle flocculator for the first compartment of a three-compartment flocculation basin shown in the figure below. (Note: There are three paddle wheels on each shaft.) The following assumptions are to be used in the design: Liquid volume = 257.2 m3 Velocity gradient = 40 s-1 Motor efficiency = 80% Paddle velocity relative to water = 0.5 m/s Water temperature = 15 C Drag coefficient = 1.8 No vertical baffles are present
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Determine the required width of the paddle blade and recommend a motor power (W) and rotational speed (rpm) for the horizontal shaft of a cross-flow paddle flocculator for the first compartment of a three-compartment flocculation basin shown in the figure below. (Note: There are three paddle wheels on each shaft.) The following assumptions are to be used in the design:
Liquid volume = 257.2 m3
Velocity gradient = 40 s-1
Motor efficiency = 80%
Paddle velocity relative to water = 0.5 m/s
Water temperature = 15 C
Drag coefficient = 1.8
No vertical baffles are present
Transcribed Image Text:One paddle wheel
+
w=0.14 m
2.5 m-
w|
W
4.2 m
Transcribed Image Text:Flow -
Flow
10.3 m
1.0 m
çkus{uct ro
0.4 m
1.0 m
m
0.4 m
5.0 m
4.2 m
0.4
1
0.4 m
4.2 m
Plan
Baffle
e
0.8 m
4.2 m
15 m
Profile
0.8 m
Baffle
4.2 m
Three cross-flow
paddle wheels
on each shaft
0.4 m
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