rördiameter2

Rördiameter2 is a variable used in piping systems and fluid dynamics to denote the inner diameter of the second pipe segment in a network or schematic. The name suggests a regional spelling; in English contexts the same concept is commonly labeled D2. It is usually expressed in meters (m) or millimeters (mm).

In hydraulic calculations, rördiameter2 determines the cross-sectional area A2 = π (D2/2)^2, which in turn affects volumetric flow rate Q and velocity v when other quantities are known. The diameter also influences the friction factor and pressure drop according to models such as Darcy–Weisbach or Hazen-Williams.

In network models, D2 may be constant along pipe 2 or may change if pipe 2 has steps or transitions. When performing simulations, D2 can be a fixed parameter or a function of position x for non-uniform pipes. If multiple pipes connect, each segment has its own diameter variable, such as D1, D2.

Measurement and notation: D2 is typically provided by design drawings, CAD models, or hydraulic data sheets. In some software, rördiameter2 is defined as an input parameter that propagates into mass conservation, momentum equations, and boundary conditions.

Example: If D2 = 0.04 m, A2 = π*(0.04)^2/4 ≈ 0.001256 m^2. For a mean velocity v2 = 2 m/s, Q2 ≈ 0.00251 m^3/s. This illustrates how changes in rördiameter2 propagate through the flow calculations and influence system performance.