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1 International Journal of Applied Mechanics and Engineering

1 2005

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Distributions of the local shear rate values in boundary layer of the agitataed vessel

Broniarz-Press L., Różańska S.

International Journal of Applied Mechanics and Engineering

2005

Vol. 10, no spec

213-218

The results of experimental studies on the distribution of shear rate on the vertical wall agitated vessel, equipped with four various impellers, have been presented. The experimental studies were carried out for two model polymer solutions, carboxymethylcellulose sodium salt (Na-CMC) and guar gum. The experimental results of the local shear rate distribution in non-Newtonian liquid agitated by different impellers, have been presented. It has been established that for studies on hydrodynamics in boundary layer and evaluation of local values of shear rate in Na-CMC and guar gum aqueous solutions by the electrochemical method the following solution of 0.005 [kmol/m3] K3[Fe(CN)6], 0.005 [kmol/m3] K4[Fe(CN)6] and 0.3 [kmol/m3] K2SO4 can be recommended. The greatest values of shear rate have been obtained for Rushton turbine whereas the lowest values occurred for paddle with 6 pitched blade of the angles of 135°.