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

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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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

One paddle wheel
+
w=0.14 m
2.5 m-
w|
W
4.2 m
Transcribed Image Text:One paddle wheel + w=0.14 m 2.5 m- w| W 4.2 m
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
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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