Page 267 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Mechanical Separations 237

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TERMINAL VELOCITIES
FOR
2 F---J,�l-::,-f-::,f"":J,-"&l"r�-4.>..,...7"1"-...-<::...,,..'re>�-+-+-+-t-+-+----+----t---+--+--; SOLID SPHERIC AL PAR TIC LES
IN
STANDARD AIR
:.o t:.-LJ..L...=...i::_JL!_Le.L- _ _L_._.__ _ _,_ _ _,__,_--l.-1..->-1-l.--1-.--'---L---'--L-.L-L.l_L.L_ _ _L___.J
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.3 .4 .s .s .7 .e 1.0 1.s 2.0 3.o 4.o so 60 1.0 eo 10 15 20 30 40 so so 10 so ICO 150 200 300 400
TERMINAL VELOCITY - INCHES PER MINUTE
Air/ VISCOSITY= 0.0181 CENTI POISE AND DENSITY= 0.0749 LBS. /CU. FT. AT 70° F.
Figure 4-7. Terminal velocities for solid spherical particles in standard air. Courtesy of American Blower Div. American Radiator and Standard
Sanitary Corporation.

1,000
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True ·specific Gravity of Particle£ v ,,, .... / ,,, "'
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CL. 10 .,. � / .,. I/ Fluid : Water at 70° F
.,.
,.,. Viscosity =0.981 Cenlipoise
� ,� ,, � Density = 62.3 lbs/cu. fl
/ .... j J .... Specific Gravity of Particlt
is Referred ta Water at
1
v v _,,/ 4 C (39.2°F) I
v.,.,, v
v
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0.0001 0.001 0.01 0.1 1.0
Terminal Settling Velocity, Feel/Second
Figure 4-8. Terminal settling velocity of particles in water. By permission, Lapple, C. E., Fluid and Particle Mechanics, 1st Ed., University of
Delaware, Newark, 195L.