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현재 위치

Froude number

작성자 Uploader : ezcivil 작성일 Upload Date: 2016-05-10변경일 Update Date: 2016-05-10조회수 View : 661

In continuum mechanics, the Froude number (Fr) is a dimensionless number defined as the ratio of the flow inertia to the external field (the latter in many applications simply due to gravity). Named after William Froude, the Froude number is based on the speed?length ratio as defined by him, and is defined as:

Fr = u / (g*l)^(1/2)
u : characteristic flow velocity.
g : in general a characteristic external field.
l : characteristic length.

For rectangular cross-sections with uniform depth d, the Froude number can be simplified to:

Fr = U / (gd)^1/2)
U : average flow velocity (m/s)
g : in particular the acceleration due to gravity (m/s^2)
d : flow depth (m)

For Fr < 1 the flow is called a subcritical flow, further for Fr > 1 the flow is characterised as supercritical flow. When Fr = 1 the flow is denoted as critical flow.

*** 참고문헌[References] ***

https://en.wikipedia.org/wiki/Froude_number

Fr = U / (g*d)^(1/2)


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현재 위치

Froude number

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