Impeller/Agitator: Reynolds Number Range 10-10^6

Q: What is the difference between axial and radial flow impellers?

Axial flow impellers (like pitched blade turbines) push fluid parallel to the shaft axis, creating top-to-bottom circulation ideal for blending and solid suspension. Radial flow impellers (like Rushton turbines) discharge fluid perpendicular to the shaft, generating high shear suitable for gas dispersion and emulsification.

Q: How do I select impeller material for corrosive applications?

Material selection follows corrosion charts: 316L SS for mild acids/alkalis, Hastelloy for oxidizing acids, titanium for chlorides, and fluoropolymers for aggressive chemicals. Consider temperature, concentration, and presence of halides. Always conduct corrosion testing for critical applications.

Q: What causes impeller imbalance and how is it corrected?

Imbalance results from manufacturing tolerances, material inhomogeneity, erosion, or buildup. Dynamic balancing to ISO 1940 G2.5 standard is required. Correction methods include material removal/addition at specific radii or using balancing rings. Imbalance above 0.5 mm/s vibration requires immediate correction.

Component Specifications

Definition

An impeller/agitator is a precision-engineered rotating component installed in mixing vessels, reactors, or tanks that converts mechanical energy from a drive system into fluid motion. It creates controlled flow patterns (axial, radial, or tangential) to achieve specific process objectives such as blending multiple phases, suspending solids, enhancing heat/mass transfer, or promoting chemical reactions. Critical design parameters include blade geometry, diameter-to-tank ratio, rotational speed, and power number.

Working Principle

Operates on fluid dynamics principles where rotational motion generates velocity gradients and shear forces. Blade geometry determines flow pattern: axial-flow impellers (like propellers) create top-to-bottom circulation for blending; radial-flow impellers (like turbines) produce high shear for dispersion; mixed-flow designs combine characteristics. The impeller's rotation induces primary flow while creating secondary vortices and turbulence that enable mixing at molecular or droplet level.

Materials

Selection depends on process requirements: 316L stainless steel (corrosion resistance for chemical/pharmaceutical), Hastelloy C-276 (extreme corrosion resistance), titanium (chloride environments), carbon steel (non-corrosive applications), polypropylene/PTFE (chemical inertness), or ceramic-coated (abrasion resistance). Surface finishes range from Ra 0.8μm for sanitary applications to epoxy coatings for corrosion protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	100-3000 mm
Tip Speed	1-25 m/s
Blade Count	2-6 blades
Solidity Ratio	0.1-0.8
Hub Configuration	Keyed, splined, or tapered
Power Number (Np)	0.3-5.0
Reynolds Number Range	10-10^6

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 2858, DIN 28131, ASME B73.1, 3-A Sanitary Standards

Parent Products

This component is used in the following industrial products

Mixing Equipment

Equipment used to blend and homogenize drilling mud components within a mud system.

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Engineering Analysis

Risks & Mitigation

Cavitation damage from low NPSH
Fatigue failure at blade root
Corrosion under deposits
Bearing overload from fluid forces
Fouling reduces efficiency

FMEA Triads

Trigger: Cavitation due to insufficient NPSH or high tip speed
Failure: Pitting erosion leading to blade material loss and imbalance
Mitigation: Maintain NPSH > 1.3 × NPSHr, limit tip speed < 15 m/s, use cavitation-resistant materials

Trigger: Corrosion fatigue from cyclic stress in corrosive environment
Failure: Crack initiation at stress concentrators (weld joints, sharp transitions)
Mitigation: Specify corrosion fatigue resistant alloys, eliminate stress risers, apply compressive residual stress treatments

Trigger: Abrasive wear from suspended particles
Failure: Progressive blade thinning altering hydrodynamic performance
Mitigation: Hard-facing with tungsten carbide, ceramic coatings, or replaceable wear plates

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerance per ISO 2768-m, balance tolerance ISO 1940 G2.5, runout < 0.1 mm TIR

Test Method

Hydrodynamic performance testing per ISO 3219, material certification per ASTM/EN standards, NDE per ASME V

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Impeller/Agitator

Manufacturer profiles associated with Impeller/Agitator.

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Frequently Asked Questions

What is the difference between axial and radial flow impellers?