Ulostulopinnan
Ulostulopinnan is a Finnish term used in engineering and physics to denote the boundary surface through which a substance, typically a fluid or gas, exits a system or component. The surface defines the exit plane of the domain and serves as a boundary for mass, momentum and energy transfer.
In practice, ulostulopinta can be the open end of a pipe or duct, the exit plane of
Design and analysis considerations include the surface’s orientation, cross-sectional area, roughness, and geometry, all of which
Etymology and usage: the term combines ulostulo (exit) and pinta (surface). It is a standard concept in