Phase Behavior and ThermodynamicsFluid Properties
Newtonian Shear Stress from Viscosity Formula
Newtonian Shear Stress from Viscosity calculates shear stress for fluid properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (mu, du_dy) are known and the assumptions behind the cited fluid properties relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, tau equals 1.8 Pa.
muPa*s
0.012
du_dy1/s
150
Inputs
mu
Pa*sDynamic Viscosity
du_dy
1/sVelocity Gradient
Outputs
tau
Pa
Shear Stress
mu
Pa*s
Dynamic Viscosity
du_dy
1/s
Velocity Gradient
Source and review
reviewedEngineering LibreTexts. Slurry Transport, Section 2.4.5 Viscosities.
Source