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Power characteristics of inline rotor-stators with different head designs

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journal contribution
posted on 06.01.2022, 11:49 authored by Alex Hannam, Trevor Sparks, Gul Ozcan-TaskinGul Ozcan-Taskin
In-line rotor-stators are widely used for power intensive industrial applications, such as deagglomeration, emulsification. There is limited information on characteristic power numbers for different designs which can be used to calculate the average power input as a means to evaluate process performance. This study made use of 18 different rotor-stators, 17 of which were toothed designs with different geometry, and also a commercially available design, with the objectives of evaluating the applicability of different expressions for characteristic power numbers and establishing the effects of geometric variations on the power input.
The expression P = Po1 ρN3D5 + Po2 ρN2D2Q is found to account for the experimental data over a wide range of operating conditions.
Rotor diameter was found to have the most prominent effect on the power input: an increase in rotor diameter from 119.6 to 123.34 mm resulted in an increase in the average power draw. The effect of rotor diameter examined with geometrically similar set ups reducing the diameter from 123.34 to 61.44 mm, for which the mixing chamber was also proportionately smaller, showed a decrease in the power input at a given speed and flowrate as well. The effects relating to the percentage of open area of the stator and number of rotor teeth were less obvious. Increasing the open area resulted in an increase in the power input – an effect which could be observed more clearly as the flowrate (1 to 4 l/s) and rotor speed (at 2000 and 3000 rpm) were also increased. Increasing the number of stator teeth increased the power input and this effect was more prominent when operating at the highest rotor speed of 3000 rpm and at low flowrates (1–2 l/s).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Chemical and Process Engineering

Volume

42

Issue

2

Pages

91 - 104

Publisher

Polish Academy of Sciences Committee of Chemical and Process Engineering

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Polish Academy of Sciences Committee of Chemical and Process Engineering under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (CC BY-NC-ND 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

02/08/2021

Publication date

2021-12-20

Copyright date

2021

ISSN

0208-6425

eISSN

2300-1925

Language

en

Depositor

Dr Gul Ozcan-Taskin. Deposit date: 1 January 2022

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