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A numerical quantity used as an index to characterize the type of flow in
a hydraulic structure in which resistance to motion depends on the
viscosity of the liquid in conjunction with the resisting force of
inertia. It is the ratio of inertia forces to viscous forces, and is equal
to the product of a characteristic velocity of the system (e.g., the mean,
surface, or maximum velocity) and a characteristic linear dimension, such
as diameter or depth, divided by the kinematic viscosity of the liquid;
all expressed in consistent units in order that the combinations will be
dimensionless. The number is chiefly applicable to closed systems of flow,
such as pipes or conduits where there is free water surface, or to bodies
fully immersed in the fluid so the free surface need not be considered.
AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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