Page 336 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

304 Applied Process Design for Chemical and Petrochemical Plants

(Ql/3J
1
.
l/3
N 113
i (Flot 6 Blade Turbine) N Q
4 b Diameter, D = --- -- (5 - 33)
2 0 ' I I
b Where using consistent units:
B
!Proptllerl
6
P = impeller power draw, FL/tor ML2/t 3
... I 4 t = time
�· 2 n=O when no Vort11 Pruenl F = fluid force on turbine, perpendicular to shaft, ML/t 2
.... Not,: n = O for Baflltd Tank L = length
&,
..
.
a
n=O Below NRe = 300
8 .
� 0 D = impeller diameter, L
0 Q = volumetric flow, L 3 /t
u
6 T = tank diameter, L
p = fluid density, M/L3
4
.is, µ=fluid viscosity, M/(Lt)
2 (Propeller) - __
I - �--� r---...... 't = torque, FL, or ML2/t2
0 (Flot 6 Blocle Turbine) Z = liquid depth
0 2 4
Ratio of Tank Diameter/Impeller Diameter NP = power number, dimensionless,
Figure 5-16. Factors in Froude number exponent, n. By permission,
Rushton, J. H., et al. [18]. (5-25)
150
140
130
120

110
500 Turbine, Flat Blade(6 or 8)
450 100
400 120 Turbine, Curved Blade (6)
110 1.5 90 Paddle 3/Shaft ( D/W: 6)
350 100
80 Paddle 2/Shaft (D/W=6)
300 80 Paddle I/Shaft (D/W =4
70
4 250 70 Turbine Pitched Blade(6) Figure 5-17. Power con-
Poddlt I/Shaft (D/W=6)
1,000 60 sumption by impeller
Paddle 1/Shaft(D/W: 8) type/dimensions for tur-
200 60 Shrouded Turbine + Stator bulent flow conditions.
-------------- Propeller Pitch = 20 Knowing impeller type,
3 .9 diameter, speed and
10 batch density; connect
150 ... �o RPM with diameter. The
.. 30 ......... ..... ...... intersection with "A,"
2 .. - .. ... .... connected to the density
..
scale, makes an inter-
:II
0
a.
100 .. .I Propeller Pitch = ID section on "B." A line
:! ,..,. 40": from this point to the
..
::,
1.5 90 0 20 .. ....,. impeller scale intersects
u
:c .01 �.6 ...
80 C) .... the horsepower scale at
the correct value. By per-
.. 70 15 -� mission, Quillen, C. S.,
a.
Q. E ts Chem. Engr., June 1954,
a:: 1.0 a:: ct Ill 0 12 en p. 177 [15].