Froude number
E415502
The Froude number is a dimensionless quantity in fluid dynamics that compares inertial forces to gravitational forces, commonly used to characterize flow regimes in open channels and around ships.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Froude number canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4119140 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Froude number Context triple: [Mach number, relatedConcept, Froude number]
-
A.
Mach number
Mach number is a dimensionless quantity in fluid dynamics and aerodynamics that expresses the ratio of an object's speed to the local speed of sound, commonly used to characterize subsonic, transonic, supersonic, and hypersonic flows.
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B.
Chandrasekhar number
The Chandrasekhar number is a dimensionless quantity in magnetohydrodynamics that measures the relative importance of magnetic forces compared to viscous forces in a conducting fluid.
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C.
Callahan flow
Callahan flow is a notable basaltic lava flow associated with Medicine Lake Volcano in northern California, formed during one of its relatively recent volcanic eruptions.
-
D.
Saffman
Saffman is a surname most notably associated with Philip G. Saffman, a prominent British-American applied mathematician and fluid dynamicist.
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E.
Einstein bed-load function
The Einstein bed-load function is a seminal hydraulic engineering formula developed by Hans Albert Einstein to predict the transport rate of sediment particles rolling and sliding along a riverbed under flowing water.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Froude number Target entity description: The Froude number is a dimensionless quantity in fluid dynamics that compares inertial forces to gravitational forces, commonly used to characterize flow regimes in open channels and around ships.
-
A.
Mach number
Mach number is a dimensionless quantity in fluid dynamics and aerodynamics that expresses the ratio of an object's speed to the local speed of sound, commonly used to characterize subsonic, transonic, supersonic, and hypersonic flows.
-
B.
Chandrasekhar number
The Chandrasekhar number is a dimensionless quantity in magnetohydrodynamics that measures the relative importance of magnetic forces compared to viscous forces in a conducting fluid.
-
C.
Callahan flow
Callahan flow is a notable basaltic lava flow associated with Medicine Lake Volcano in northern California, formed during one of its relatively recent volcanic eruptions.
-
D.
Saffman
Saffman is a surname most notably associated with Philip G. Saffman, a prominent British-American applied mathematician and fluid dynamicist.
-
E.
Einstein bed-load function
The Einstein bed-load function is a seminal hydraulic engineering formula developed by Hans Albert Einstein to predict the transport rate of sediment particles rolling and sliding along a riverbed under flowing water.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
dimensionless quantity
ⓘ
hydraulic parameter ⓘ similarity parameter ⓘ |
| appliesTo |
channel transitions
ⓘ
free-surface flows ⓘ gravity currents ⓘ open-channel flow ⓘ river hydraulics ⓘ ship motion in water ⓘ sluice gate flows ⓘ spillway flows ⓘ wave–structure interaction ⓘ |
| assumes | dominance of gravitational forces over surface tension in many applications ⓘ |
| characterizes |
critical flow when Fr = 1
ⓘ
subcritical flow when Fr < 1 ⓘ supercritical flow when Fr > 1 ⓘ |
| definition |
Fr = U / sqrt(g L) in its common form
ⓘ
ratio of characteristic flow velocity to gravity wave celerity ⓘ |
| describes | ratio of inertial forces to gravitational forces ⓘ |
| dimension | dimensionless ⓘ |
| field |
coastal engineering
ⓘ
fluid dynamics ⓘ hydraulics ⓘ naval architecture ⓘ open-channel flow ⓘ |
| governs | similarity between hydraulic model and prototype under gravity effects ⓘ |
| hasParameter |
characteristic length
ⓘ
characteristic velocity ⓘ gravitational acceleration ⓘ |
| namedAfter | William Froude ⓘ |
| relatedTo |
Bond number
ⓘ
Mach number ⓘ Reynolds number ⓘ Weber number ⓘ |
| symbol | Fr ⓘ |
| usedFor |
analysis of flow over hydraulic structures
ⓘ
analysis of wave run-up and overtopping ⓘ characterizing flow regimes in open channels ⓘ characterizing gravity-dominated flows ⓘ characterizing ship resistance and wave-making ⓘ classifying subcritical and supercritical flow ⓘ design of spillways and weirs ⓘ model–prototype similarity in hydraulic models ⓘ predicting hydraulic jumps ⓘ scale effects in towing tank experiments ⓘ ship model testing ⓘ |
| usedIn |
dam spillway design
ⓘ
design of navigation channels ⓘ ship hull form optimization ⓘ towing tank experiments ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Froude number Description of subject: The Froude number is a dimensionless quantity in fluid dynamics that compares inertial forces to gravitational forces, commonly used to characterize flow regimes in open channels and around ships.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.