Question

How to calculate rpm with shear stress or shear rate?

Answer 1

RPM to shear rate

When we perform rheological experiments with a viscometer, usually it gives us shear stress values corresponding to particular revolution per minute (rpm). Then we convert rpm into a shear rate by multiplying a factor 1.7.

Answer 2

Answer:

We convert rpm into a shear rate by multiplying a factor 1.7.

Explanation:

When rheological experiments with a viscometer is performed, usually it gives us shear stress values corresponding to particular revolution per minute (rpm).

The formula ​γ= V/x​ for shear rate ​γ​ ("gamma") in units of s⁻¹, velocity of the moving layer ​V​ and distance between the layers ​m​ in meters.

We can also relate shear rate ​γ​ to the shear stress ​τ​ ("tau") to viscosity, a fluid's resistance to flow, ​η​ ("eta") through

γ=η/τ

in which ​τ​ is the same units as pressure (N/m² or pascals Pa) and ​η​ in units of ​(​N/m² s). This ​viscosity​ describes the motion of the fluid and calculating a shear stress that's unique to the substance of the fluid itself.

This shear rate formula determine the intrinsic nature of sheer stress to the materials used in studying the biophysics of mechanisms such as the electron transport chain and chemical mechanisms such as polymer flooding.

1.7 should therefore be a combination of dimensions of your system.

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