Enter the shear stress, the distance between layers, and shear velocity into the calculator to determine the dynamic viscosity.

Dynamic Viscosity Formula

The following formula is used to calculate dynamic viscosity.

u = t * (y/v)
  • Where u is the dynamic viscosity
  • t is the shear stress
  • y is the distance between layers
  • v is the shear velocity

To calculate dynamic viscosity, divide the distance between layers by the shear velocity, then multiply by the shear stress.

Dynamic Viscosity Definition

Dynamic viscosity is defined as the resistance to movement of a fluid due to internal attractions and frictions within the fluid.

Dynamic Viscosity Example

How to calculate dynamic viscosity?

  1. First, determine the shear stress.

    Calculate the shear stress acting on the fluid due to the movement and the walls of the container.

  2. Next, determine the distance between layers.

    This will be the distance between the surfaces containing the fluid.

  3. Next, determine the shear rate.

    Calculate the rate of the shear that is being applied to the fluid.

  4. Finally, calculate the dynamic viscosity.

    Using the formula, calculate the dynamic viscosity.


What factors affect dynamic viscosity?

Dynamic viscosity is influenced by temperature, pressure, and the chemical composition of the fluid. As temperature increases, the viscosity of liquids typically decreases, while the viscosity of gases increases. Pressure can also affect viscosity, but its effect is more complex and depends on the type of fluid.

How is dynamic viscosity measured?

Dynamic viscosity can be measured using various instruments such as viscometers and rheometers. These devices measure the force required to move one layer of fluid in relation to another or the resistance a fluid exhibits to flow under an applied force.

Why is dynamic viscosity important in engineering and fluid mechanics?

Dynamic viscosity is crucial in engineering and fluid mechanics because it affects the flow behavior of fluids in systems. It is essential for designing and analyzing systems involving fluid flow, such as pipelines, hydraulic systems, and chemical process equipment. Understanding viscosity helps in predicting how fluids will behave under different conditions, which is vital for efficiency and safety.

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