Page 328 - Chemical Process Equipment - Selection and Design

292 MIXING AND AGITATION
100
8060
40
20
10
8-
a 6
W
4
m
x 2
z
3
0.8- 1
5 0.6
0.4
a 0.2
0.1
0.01 0.1
1 10 100 1000 10000 100000 1000000 1 f0 fO* to3 yo4 Id f06
REYNOLDS NUMBER Re
(b) (C)
Figure lO.%(continued)
incorporation of TEL into gasoline where several hours may be
the following may serve as rough guides:
allowed for the operation.
Operation HP/1000 gal Tip Speed (f&/sec) Example 10.1 deals with the design and performance of an
agitation system to which the power input is specified. Some degree
Blending 0.2-0.5 of consistency is found between the several rules that have been
Homogeneous reaction 0.5-1.5 7.5-10 cited.
Reaction with heat transfer 1.5-5.0 10-15
Liquid-liquid mixtures 5 15-20
Liquid-gas mixtures 5-10 15-20 10.4. POWER CONSUMPTION AND PUMPING RATE
Slurries 10
These basic characteristics of agitation systems are of paramount
The low figure shown for blending is for operations such as importance and have been investigated extensively. The literature is

t
DISK E, VERTICAL DISK 6 VERT I CAL CURVED PITCHED
BLADE BLADE BLADE BLADE BLADE BLADE

CURVE I CURVE 2 CUi'VE 3 CURVE 4 CURVE 5 CURVE 6

100

50

In%
n
rr?
z
'"
IO
Ol
4
z "a 5 -
j
-
1

I I

0.5 I 1 1 ill
I IO I 0' to' I 0' I 0'
NRe = ND p/p
2
Figure 10.6. Power number against Reynolds number of some turbine impellers [Bates, Fondy, and Corpstein, Ind. Eng. Chem. Process.
Des. Dev. 2(4) 311 (1963)l.