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  2. Shear velocity - Wikipedia

    en.wikipedia.org/wiki/Shear_velocity

    The velocity profile near the boundary of a flow (see Law of the wall) Transport of sediment in a channel; Shear velocity also helps in thinking about the rate of shear and dispersion in a flow. Shear velocity scales well to rates of dispersion and bedload sediment transport. A general rule is that the shear velocity is between 5% and 10% of ...

  3. Shear stress - Wikipedia

    en.wikipedia.org/wiki/Shear_stress

    This relationship can be exploited to measure the wall shear stress. If a sensor could directly measure the gradient of the velocity profile at the wall, then multiplying by the dynamic viscosity would yield the shear stress. Such a sensor was demonstrated by A. A. Naqwi and W. C. Reynolds. [8]

  4. Boundary layer - Wikipedia

    en.wikipedia.org/wiki/Boundary_layer

    Similar approaches to the above analysis has also been applied for thermal boundary layers, using the energy equation in compressible flows. [15] [16] The additional term ′ ′ ¯ in the turbulent boundary layer equations is known as the Reynolds shear stress and is unknown a priori.

  5. Law of the wall - Wikipedia

    en.wikipedia.org/wiki/Law_of_the_wall

    The logarithmic law of the wall is a self similar solution for the mean velocity parallel to the wall, and is valid for flows at high Reynolds numbers — in an overlap region with approximately constant shear stress and far enough from the wall for (direct) viscous effects to be negligible: [3]

  6. Shear flow - Wikipedia

    en.wikipedia.org/wiki/Shear_flow

    In these instances, it can be useful to express internal shear stress as shear flow, which is found as the shear stress multiplied by the thickness of the section. An equivalent definition for shear flow is the shear force V per unit length of the perimeter around a thin-walled section. Shear flow has the dimensions of force per unit of length. [1]

  7. Shell balance - Wikipedia

    en.wikipedia.org/wiki/Shell_Balance

    The balance is determining what goes into and out of the shell. Momentum is created within the shell through fluid entering and leaving the shell and by shear stress. In addition, there are pressure and gravitational forces on the shell. From this, it is possible to find a velocity for any point across the flow.

  8. Von Kármán constant - Wikipedia

    en.wikipedia.org/wiki/Von_Kármán_constant

    where u is the mean flow velocity at height z above the boundary. The roughness height (also known as roughness length ) z 0 is where u {\displaystyle u} appears to go to zero. Further κ is the von Kármán constant being typically 0.41, and u ⋆ {\displaystyle u_{\star }} is the friction velocity which depends on the shear stress τ w at the ...

  9. Power-law fluid - Wikipedia

    en.wikipedia.org/wiki/Power-law_fluid

    A Newtonian fluid is a power-law fluid with a behaviour index of 1, where the shear stress is directly proportional to the shear rate: = These fluids have a constant viscosity, μ, across all shear rates and include many of the most common fluids, such as water, most aqueous solutions, oils, corn syrup, glycerine, air and other gases.