An LDA Study of Shear rate profiles of Rushton turbine in mixing tanks

An LDA Study of Shear rate profiles of Rushton turbine in mixing tanks

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Part of #An LDA Study of Shear rate profiles of Rushton turbine in mixing tanks# :

Publishing year : 2007

Conference : 5th International Congress of Chemical Engineering

Number of pages : 8

Abstract: In this article, the distribution of local shear rates for the Rushton turbine impeller has been studied using laser doppler anemometry (LDA) for viscoelastic liquids. The normalized local tangential velocity and local shear rate profiles are independent of the Rushton's turbine impeller speeds and the main variations of shear rate occur in the vicinity of the impeller. This is due to the large variations in tangential velocity in this region. In the transition region, i. e. 30 & lt; Re & lt; 2000, tangential velocity component and local shear rate, are shown to be negligible at the axial coordinate of z = 0.0315 m above the tipper plane of the impeller, i. e. z = 0