voolukiirus
Voolukiirus is a term from fluid dynamics referring to the magnitude of the velocity of a fluid element as it moves through space or across a cross-section. The word is Estonian for flow speed or flow velocity. It is a key quantity in calculating how much fluid passes a given area, how momentum and energy are transported, and how systems driven by fluids operate.
In general, the instantaneous flow velocity is a vector, whose magnitude is the flow speed. The average
In pipe flow, the velocity profile depends on the flow regime. Laminar flow in a circular pipe
In open-channel flow, velocity typically varies with depth and along the channel, requiring profiles or measurements
Applications of voolukiirus span engineering (pumps, pipelines, HVAC), environmental science (river discharge, rainfall-driven runoff), and meteorology