Engineering Integrity Blog

Introducing the Sidewinder (Side Entry) GCD Mixer

February 6, 2017

Cleveland Mixer is pleased to announce the addition of the new Sidewinder GCD Mixer to our product Line. The Sidewinder features a high efficiency (up to 95%) gear reducer. It has an ultra-rigid, single piece, high density , cast iron housing, creating a foundation for bearing strength and a long life of trouble free service.

Mixing a broad range of volumes and viscosities is possible with this mixer. It mixes volumes up to 1,000,000 gallons as well. Due to its great strength, it is able to mix more with less horsepower. This translates to cost savings both on the initial purchase and on operating costs. Long intervals between oil changes and a two-stage gearbox concept reduce maintenance costs and the need for a large stock of spare parts.

This is a heavy duty, long lasting mixer that can handle almost any job.

To achieve the customer’s desired process result, the impeller type selected is the determinative factor. Why? In simple terms, it is the impeller that does the work in the fluid. Why is a hydrofoil impeller sometimes selected over other impeller types?

The selection process for an impeller looks at the following 4 critical elements:

    1. Tank Geometry & Liquid Levels
    2. Fluid Properties
    3. Reynolds Number Calculation
    4. Process Goal(s) or Classification

From these 4 elements an impeller design is selected. Hydrofoils, Axial Flow Turbines (aka pitched blade turbines), Radial Flow Impellers, or Close Clearance Impellers such as anchors and ribbons.

Hydrofoil impellers consume less HP per rotation than other impeller types. They have a narrower blade width ratio than other impeller types, they weigh less and they have proven to be well suited in a host of applications such as low viscosity blending, thermal uniformity and in some solids suspension applications.

While the Hydrofoil impeller is well applied in a multitude of applications, it does have its limits. Hydrofoils operate best in turbulent and transitional flow regimes (high and medium Reynolds Number environments). They do not effectively mix in Newtonian fluids where the Reynolds number is below 200.

Axial flow turbines have been used since the 1940’s. Their principle of operation is not dissimilar from Archimedes’ screw. They are available in 2,4,and 6 bladed designs. Their pitch can be adjusted from 20 up to 75 degrees.

Axial flow turbines are applied in those processes where

  1. Aggressive surface disturbance is required to blend relatively low density powders or liquids into fluids.
  2. Mixing/blending or stirring is required in transitional or laminar flow regimes where the impeller Reynolds number ranges from 50 to 500.
  3. Mass transfer applications that require high specific power input to achieve the reaction sought.
  4. Applications in tall vessels with relatively small diameters which prevent the use of hydrofoils and rquire a certain amount of invested power to achieve solids suspension or blending, wet-out performance.
 

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