The Effect of Liquid Viscosity on Critical Impeller Speed in an Agitated Vessel

Author(s): Chitra Devarajulu*, Muruganandam Loganathan.

Journal Name: Recent Innovations in Chemical Engineering
Formerly: Recent Patents on Chemical Engineering

Volume 10 , Issue 2 , 2017

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Graphical Abstract:


Background: Solid suspension in liquids is an important unit operation generally encountered in the process industry. In the present work solid−liquid suspensions are explored in an agitated vessel with different liquids using two radial impellers namely Rushton turbine and straight blade; two axial impellers namely pitched blade turbine and A320. The critical impeller speed (Njs) at which all solid particles get suspended and the relevant power requirements (Pjs) are evaluated. The effect liquid viscosity on these two parameters is investigated.

Conclusion: Results show that critical impeller speed and power consumption decreases as liquid viscosity increases. The critical impeller speed was found to be highest for straight blade impeller and lowest for pitched blade turbine. A320 impeller showed strong dependence of viscosity on critical impeller speed. In addition, the power consumption was found to be least for A320 impeller among the impellers investigated in this study.

Keywords: Impeller type, impeller clearance, liquid viscosity, solid suspension, critical impeller speed, wastewater treatment.

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Article Details

Year: 2017
Page: [127 - 138]
Pages: 12
DOI: 10.2174/2405520410666171003162128
Price: $65

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