A tank 1.2 m in diameter and 2 m high is filled to a depth of 1.2 m with a latex having a viscosity of 10 P and a density of 800 kg/m3 . The tank is not baffled. A three blade 360 mm diameter propeller is installed in the tank 360mm from the bottom. The pitch is 1:1 (pitch = diameter). The available motor develops 8 kW.a) Is the motor adequate to drive this agitator at a speed of 800 r/min?b) What is the maximum speed the agitator may be driven if the liquid is replaced by one having a viscosity of 1 P and the same density?c) What would be the power requirement if a propeller 360mm in diameter turning 15 r/s is used and if four baffles, each 120mm wide, are installed?

The power of pump is function of speed,diameter of impeller and Np.Np is constant called as power…

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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

Section: Chapter Questions

Problem 1.1P

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A tank 1.2 m in diameter and 2 m high is filled to a depth of 1.2 m with a latex having a viscosity of 10 P and a density of 800 kg/m3 . The tank is not baffled. A three blade 360 mm diameter propeller is installed in the tank 360mm from the bottom. The pitch is 1:1 (pitch = diameter). The available motor develops 8 kW.

a) Is the motor adequate to drive this agitator at a speed of 800 r/min?
b) What is the maximum speed the agitator may be driven if the liquid is replaced by one having a viscosity of 1 P and the same density?
c) What would be the power requirement if a propeller 360mm in diameter turning 15 r/s is used and if four baffles, each 120mm wide, are installed?

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If the propeller in this problem is replaced by a six-bladed turbine of 400 mm diameter, and the fluid being stirred is a pseudoplastic liquid that follows the power law with an apparent viscosity of 15 P when the velocity gradient is 10 s-1, at what speed must the turbine rotate to provide 1 kW/m3 of liquid? For this fluid n′= 0.75 and ρ = 950 kg/m3.

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