enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Moody chart - Wikipedia

    en.wikipedia.org/wiki/Moody_chart

    In engineering, the Moody chart or Moody diagram (also Stanton diagram) is a graph in non-dimensional form that relates the Darcy–Weisbach friction factor f D, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe. It can be used to predict pressure drop or flow rate down such a pipe.

  3. Entrance length (fluid dynamics) - Wikipedia

    en.wikipedia.org/wiki/Entrance_length_(fluid...

    In fluid dynamics, the entrance length is the distance a flow travels after entering a pipe before the flow becomes fully developed. [1] Entrance length refers to the length of the entry region, the area following the pipe entrance where effects originating from the interior wall of the pipe propagate into the flow as an expanding boundary layer.

  4. Boundary conditions in fluid dynamics - Wikipedia

    en.wikipedia.org/wiki/Boundary_conditions_in...

    It acts as a mirror that reflects all the flow distribution to the other side. [5] The conditions at symmetric boundary are no flow across boundary and no scalar flux across boundary. A good example is of a pipe flow with a symmetric obstacle in the flow. The obstacle divides the upper flow and lower flow as mirrored flow.

  5. Reynolds number - Wikipedia

    en.wikipedia.org/wiki/Reynolds_number

    For flow in a pipe of diameter D, experimental observations show that for "fully developed" flow, [n 2] laminar flow occurs when Re D < 2300 and turbulent flow occurs when Re D > 2900. [13] [14] At the lower end of this range, a continuous turbulent-flow will form, but only at a very long distance from the inlet of the pipe. The flow in between ...

  6. Fluid dynamics - Wikipedia

    en.wikipedia.org/wiki/Fluid_dynamics

    A flow that is not a function of time is called steady flow. Steady-state flow refers to the condition where the fluid properties at a point in the system do not change over time. Time dependent flow is known as unsteady (also called transient [8]). Whether a particular flow is steady or unsteady, can depend on the chosen frame of reference.

  7. Outline of fluid dynamics - Wikipedia

    en.wikipedia.org/wiki/Outline_of_fluid_dynamics

    Couette flow – Model of viscous fluid flow between two surfaces moving relative to each other; Effusive limit; Free molecular flow – Gas flow with a relatively large mean free molecular path; Incompressible flow – Fluid flow in which density remains constant; Inviscid flowFlow of fluids with zero viscosity (superfluids)

  8. Boundary conditions in computational fluid dynamics - Wikipedia

    en.wikipedia.org/wiki/Boundary_conditions_in...

    In fully developed flow no changes occurs in flow direction, gradient of all variables except pressure are zero in flow direction The equations are solved for cells up to NI-1, outside the domain values of flow variables are determined by extrapolation from the interior by assuming zero gradients at the outlet plane

  9. Hagen–Poiseuille equation - Wikipedia

    en.wikipedia.org/wiki/Hagen–Poiseuille_equation

    The laminar flow through a pipe of uniform (circular) cross-section is known as Hagen–Poiseuille flow. The equations governing the Hagen–Poiseuille flow can be derived directly from the Navier–Stokes momentum equations in 3D cylindrical coordinates ( r , θ , x ) by making the following set of assumptions: