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A mixing time of 29 s was measured for a 4.5-ft baffled tank with a 1.5-ft six-blade turbine and a liquid depth of 4.8 ft. The turbine speed was 75 r/min, and the fluid has a viscosity of 3 cP and a density of 65 lb/ft’. Estimate the mixing times if an impeller one-quarter or one-half the tank diameter were used with the speeds chosen to give the same power per unit volume.

A mixing time of 29 s was measured for a 4.5-ft baffled tank with a 1.5-ft six-blade turbine and a liquid depth of 4.8 ft. The turbine speed was 75 r/min, and the fluid has a viscosity of 3 cP and a density of 65 lb/ft’. Estimate the mixing times if an impeller one-quarter or one-half the tank diameter were used with the speeds chosen to give the same power per unit volume.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
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A mixing time of 29 s was measured for a 4.5-ft baffled tank with a 1.5-ft six-blade turbine and a liquid depth of 4.8 ft. The turbine speed was 75 r/min, and the fluid has a viscosity of 3 cP and a density of 65 lb/ft³. Estimate the mixing times if an impeller one-quarter or one-half the tank diameter were used with the speeds chosen to give the same power per unit volume.
Transcribed Image Text:A mixing time of 29 s was measured for a 4.5-ft baffled tank with a 1.5-ft six-blade turbine and a liquid depth of 4.8 ft. The turbine speed was 75 r/min, and the fluid has a viscosity of 3 cP and a density of 65 lb/ft³. Estimate the mixing times if an impeller one-quarter or one-half the tank diameter were used with the speeds chosen to give the same power per unit volume.
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