The blending efficiencies of some impellers in batch mixing

✍ Scribed by M. Moo-Young; K. Tichar; F. A. L. Dullien

• Publisher: American Institute of Chemical Engineers
• Year: 1972
• Tongue: English
• Weight: 450 KB
• Volume: 18
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690180133

✦ Synopsis

Mixing times for the blending of viscous liquids with tracer materials have been measured

in a mechanically agitated tank using two conventional agitator types (turbine, helical ribbon) and a series of novel tubular-type agitators. The range of conditions studied were: viscosity = 1 to 70,000 cP, agitator Reynolds number = 5 to lo5, tank diameter = 11.5 in. It was found that in terms of agitator power requirement, the tubular agitators were generally more efficient for viscosities greater than lOOcP than the others for the blending process.

The effects of pseudoplastic non-Newtonian fluid behavior, of tank-baffles, and of tank size on mixing times have also been examined in several of the above cases. 6. double tubular agitator 11: D (upper and lower) = 7.0 in., I.D. of main tube = 0.69 in. (O.D. = 0.75 in.), I.D. of arms (upper and lower) = 0.44 in. (O.D. = 0.50 in.), C = 1.5 in., C1 = 8 in., Cz = 4 in.