inviscid

(adjective)

A fluid with zero viscosity (internal friction). In reality viscosity is always present. However, it is often very small compared with other forces (e.g. gravity, pressure) and for common fluids (water and air) the fluid can be approximated as having zero viscosity.

Examples of inviscid in the following topics:

  • Application of Bernoulli's Equation: Pressure and Speed

    • Bernoulli's equation states that for an incompressible and inviscid fluid, the total mechanical energy of the fluid is constant .
    • (An inviscid fluid is assumed to be an ideal fluid with no viscosity. )
    • However, the assumption of inviscid flow remains in both the unsteady and compressible versions of the equation.

  • Torricelli's Law

    • This relationship applies for an "ideal" fluid (inviscid and incompressible) and results from an exchange of potential energy,