Where Can I Find Information on Drag Coefficients for Slow Speed Mixers?

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SUMMARY

This discussion focuses on the challenges of designing a slow speed mixer, specifically in calculating the drag coefficient and drag force on a rotating mixer blade. The fluid in question has a viscosity of approximately 100,000 poise and a density of 1.3 g/cm³, with a Reynolds number significantly less than 1 (Re << 1). The user seeks information beyond Stokes' Law (FD = 6πrVu) to accurately approximate the drag coefficient for a mixer blade with a cross-sectional footprint of approximately 3" x 1/3". The importance of obtaining fundamental design information from the mixer manufacturer is also emphasized.

PREREQUISITES
  • Understanding of Stokes' Law and its application in fluid dynamics
  • Knowledge of drag coefficients in low Reynolds number flows
  • Familiarity with fluid viscosity measurements (e.g., poise)
  • Basic principles of mixer design and operation
NEXT STEPS
  • Research methods for calculating drag coefficients for low Reynolds number flows
  • Explore fluid dynamics principles related to high-viscosity fluids
  • Investigate manufacturer guidelines for mixer design and performance specifications
  • Learn about computational fluid dynamics (CFD) simulations for mixer blade analysis
USEFUL FOR

Mechanical engineers, process engineers, and anyone involved in the design and optimization of mixing equipment, particularly in applications involving high-viscosity fluids.

B12se-R
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I'm kind of stuck in my search, hoped to be able to find some answers on this board.

Anyways, I've been taksed to design a slow speed mixer and I'm trying to look up information beyond Stokes Law of FD = 6 pi r V u

The fluid to be mixed is approx. 100000 poise, incompressible fluid. I'm trying to find how to approximate a proper drag coefficient and calculate a drag force on a rotating mixer blade. Cross sectional footprint of one tine passing through the fluid is approx. 3" x 1/3". Low speed, so Re << 1. density is 1.3 g/cm3

Can someone throw me a bone please?
 
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B12se-R said:
I'm kind of stuck in my search, hoped to be able to find some answers on this board.

Anyways, I've been taksed to design a slow speed mixer and I'm trying to look up information beyond Stokes Law of FD = 6 pi r V u

The fluid to be mixed is approx. 100000 poise, incompressible fluid. I'm trying to find how to approximate a proper drag coefficient and calculate a drag force on a rotating mixer blade. Cross sectional footprint of one tine passing through the fluid is approx. 3" x 1/3". Low speed, so Re << 1. density is 1.3 g/cm3

Can someone throw me a bone please?
The mixer manufacturer should supply such fundamental design information on how to use their product.
 

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