Page 357 - BOLA Catalogue

356
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TECHNICAL INFORMATION
Stirrer Shafts with rigid paddle
Stirrer with a narrow blade. The stirring effect is based on a radial and axial flow. The product is opposed to shear forces ranging from moderate to strong.
R = (0.70 to 0.9) x D H = (0.05 to 0.1) x R B = (0.10 to 0.2) x R
Stirrer Shafts with rigid blade
Solid, plane blade in user-defined form. Stirring effect due to different rotation speeds of the product displaced by stirring and the residual vessel content.
R = (0.4 to 0.5) x D H = (0.9 to 1) x R B = 0.3 x R
Stirrer Shafts with angular blades
Stirrer shaft with several inclined, rectangular, straight blades (special form a2 = 90 degrees, also curved blades). The stirring effect is based on an axially directed flow combined with an increased shear rate. Reversion of the flow can be obtained by changing the inclination of the blades or the rotation direction.
R = (0.30 to 0.40) x D H = (0.15 to 0.25) x R B = (0.50 to 1.00) x R
U-shaped stirrer shafts
Anchor stirrer blade adapted to the vessel’s wall, reaches from edge to edge. The stirring effect is based on a mainly tangential flow with poor axial forces.
R = (0.90 to 0.95) x D H = (0.50 to 1.00) x R B = (0.003 to 0.005) x R
Double impulse stirrer shafts
Stirrer shaft with two contrarily aligned blades on a radial arm. The stirring effect is based on an axial flow with poor radial forces. Analogue to the conveying direction of the blades an axial flow arises near to the shaft. The conveying direction of the outer paddles is adapted to the mixing demands.
R = 0.70 x D H = 0.20 x R B = 0.28 x R
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