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Overview Stirrers / Geometry

Overview Stirrers / Geometry

Product catalog summary

Overview: This document provides a comprehensive overview of various stirrer geometries and their applications in mixing processes. It highlights the importance of selecting the appropriate stirrer type for successful mixing operations.

Stirrer Types and Specifications:

Propeller (3-Bladed and 4-Bladed): These stirrers are designed for axial flow patterns with tip speeds ranging from 2 to 15 m/s. They are suitable for low to medium viscosity applications and provide low to medium shear forces. Common applications include homogenizing, suspending, and promoting circulation.
Dissolver: Known for very high shear forces, these stirrers operate at tip speeds of 8 to 20 m/s and are ideal for dispersing high shear materials and heat exchange processes.
Anchor and Spiral: These stirrers are used for high viscosity applications with tangential flow patterns and low shear forces. They are effective in homogenizing and heat exchange.
Rushton/Turbine and Paddle: These stirrers provide radial flow patterns with medium to high viscosity range and are used for dispersing very high shear materials and heat exchange.

Geometric Dimensions:

Preferred Geometric Dimension d2/d1: This ratio varies depending on the stirrer type, ranging from 0.1 to 0.98, indicating the relationship between stirrer diameter and container diameter.
Preferred Geometric Dimension h3/d1: Applicable to certain stirrers, this ratio ranges from 0.3 to 3, indicating the bottom distance relative to container diameter.
Preferred Geometric Dimension h1/d1: Generally set at 1.0, this ratio indicates the fill height relative to container diameter, except for the paddle stirrer, which is 0.75.

Conclusion: The document emphasizes the critical role of selecting the correct stirrer geometry to optimize mixing efficiency, considering factors such as viscosity, shear forces, and flow patterns.

Catalog excerpts

rushton/ spiral turbine paddle Flow pattern Tip Speed/ Circumferential 2 - 15 Speed (m/S) Viscosity range low - medium low - medium low Shear Forces very high Homogenize Homogenize Suspend Suspend Disperse - High Disperse - High Disperse - High Sheer Sheer Sheer Promote Promote circulation circulation Heat Exchange Homogenize Disperse - very Homogenize Heat Exchange high Sheer Heat Exchange Prefered geom. Prefered geom. Prefered geom. d1: container diameter d2: stirrer diameter h.: fill height h3: bottom distance iKA-Werke GmbH & Co. KG Janke & Kunkel-StraRe 10, 79219 Staufen, Germany Telefon:...

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