Reynolds number
E620784
The Reynolds number is a dimensionless quantity in fluid mechanics that characterizes the flow regime of a fluid, indicating whether it is laminar or turbulent based on the ratio of inertial to viscous forces.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Reynolds number canonical | 5 |
How this entity was disambiguated
This entity first appeared as the object of triple T6788380 — 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: Reynolds number Context triple: [Stokes' law, relatedTo, Reynolds number]
-
A.
Froude number
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.
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B.
Knudsen number
The Knudsen number is a dimensionless quantity in fluid dynamics that compares a gas’s molecular mean free path to a characteristic physical length scale, indicating whether continuum or rarefied flow models are appropriate.
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C.
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.
-
D.
Stokes' law
Stokes' law is a fundamental equation in fluid dynamics that describes the drag force experienced by small spherical particles moving slowly through a viscous fluid.
-
E.
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.
- 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: Reynolds number Target entity description: The Reynolds number is a dimensionless quantity in fluid mechanics that characterizes the flow regime of a fluid, indicating whether it is laminar or turbulent based on the ratio of inertial to viscous forces.
-
A.
Froude number
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.
-
B.
Knudsen number
The Knudsen number is a dimensionless quantity in fluid dynamics that compares a gas’s molecular mean free path to a characteristic physical length scale, indicating whether continuum or rarefied flow models are appropriate.
-
C.
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.
-
D.
Stokes' law
Stokes' law is a fundamental equation in fluid dynamics that describes the drag force experienced by small spherical particles moving slowly through a viscous fluid.
-
E.
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.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf | dimensionless quantity ⓘ |
| affects |
boundary layer behavior
ⓘ
drag coefficient ⓘ heat transfer coefficients ⓘ |
| appliesTo |
external flows
ⓘ
flow over bodies ⓘ internal flows ⓘ pipe flow ⓘ |
| basedOn | ratio of inertial forces to viscous forces ⓘ |
| characterizes | flow regime ⓘ |
| classification |
high Reynolds number flow
ⓘ
low Reynolds number flow ⓘ |
| dependsOn |
characteristic length
ⓘ
dynamic viscosity ⓘ fluid density ⓘ fluid velocity ⓘ |
| dimension | dimensionless ⓘ |
| field | fluid mechanics ⓘ |
| formula |
Re = (v L) / ν
ⓘ
Re = (ρ v L) / μ ⓘ |
| governs | similarity of flows at different scales ⓘ |
| highReCharacteristic | inertial forces dominate ⓘ |
| introducedInField | hydrodynamics ⓘ |
| lowReCharacteristic | viscous forces dominate ⓘ |
| namedAfter | Osborne Reynolds ⓘ |
| relatedTo |
Navier–Stokes equations
ⓘ
laminar flow ⓘ transitional flow ⓘ turbulent flow ⓘ |
| SIUnit | 1 ⓘ |
| symbol | Re ⓘ |
| transitionalRange | 2000 < Re < 4000 for pipe flow ⓘ |
| typicalLaminarThreshold | Re < 2000 for pipe flow ⓘ |
| typicalTurbulentThreshold | Re > 4000 for pipe flow ⓘ |
| usedFor |
distinguishing laminar and turbulent flow
ⓘ
model testing in wind tunnels ⓘ predicting onset of turbulence ⓘ scaling laboratory experiments to real systems ⓘ |
| usedIn |
aerodynamics
ⓘ
chemical engineering ⓘ heat transfer analysis ⓘ hydraulics ⓘ turbulence modeling ⓘ |
| usesParameter |
L (characteristic length)
ⓘ
v (velocity) ⓘ μ (dynamic viscosity) ⓘ ν (kinematic viscosity) ⓘ ρ (density) ⓘ |
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: Reynolds number Description of subject: The Reynolds number is a dimensionless quantity in fluid mechanics that characterizes the flow regime of a fluid, indicating whether it is laminar or turbulent based on the ratio of inertial to viscous forces.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.