Saffman lift force
E167642
The Saffman lift force is a hydrodynamic force acting on small particles in shear flow, causing them to migrate laterally due to velocity gradients in the surrounding fluid.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Saffman lift force canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1463726 — 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: Saffman lift force Context triple: [Philip G. Saffman, hasNotableConcept, Saffman lift force]
-
A.
Stokes flow
Stokes flow is a type of fluid motion dominated by viscous forces and characterized by very low Reynolds numbers, where inertial effects are negligible.
-
B.
An Introduction to Fluid Dynamics
An Introduction to Fluid Dynamics is a classic graduate-level textbook that rigorously develops the theoretical foundations of fluid mechanics and has become a standard reference in the field.
-
C.
On the Motion of Small Particles Suspended in Liquids at Rest Required by the Molecular-Kinetic Theory of Heat
"On the Motion of Small Particles Suspended in Liquids at Rest Required by the Molecular-Kinetic Theory of Heat" is Albert Einstein’s 1905 paper that provided a theoretical explanation of Brownian motion, offering strong evidence for the existence of atoms and molecules.
-
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.
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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: Saffman lift force Target entity description: The Saffman lift force is a hydrodynamic force acting on small particles in shear flow, causing them to migrate laterally due to velocity gradients in the surrounding fluid.
-
A.
Stokes flow
Stokes flow is a type of fluid motion dominated by viscous forces and characterized by very low Reynolds numbers, where inertial effects are negligible.
-
B.
An Introduction to Fluid Dynamics
An Introduction to Fluid Dynamics is a classic graduate-level textbook that rigorously develops the theoretical foundations of fluid mechanics and has become a standard reference in the field.
-
C.
On the Motion of Small Particles Suspended in Liquids at Rest Required by the Molecular-Kinetic Theory of Heat
"On the Motion of Small Particles Suspended in Liquids at Rest Required by the Molecular-Kinetic Theory of Heat" is Albert Einstein’s 1905 paper that provided a theoretical explanation of Brownian motion, offering strong evidence for the existence of atoms and molecules.
-
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 |
fluid mechanics concept
ⓘ
hydrodynamic force ⓘ lift force ⓘ |
| actsOn | small particles ⓘ |
| appliesTo |
non-Brownian particles in many derivations
ⓘ
particles smaller than the smallest flow length scale ⓘ |
| assumes |
creeping flow regime
ⓘ
nearly spherical particles ⓘ |
| category |
non-inertial lift mechanism
ⓘ
particle–fluid interaction force ⓘ |
| cause | lateral migration of particles ⓘ |
| dependsOn |
fluid density
ⓘ
fluid viscosity ⓘ particle diameter ⓘ relative slip velocity between particle and fluid ⓘ velocity gradient in the surrounding fluid ⓘ |
| derivedUnder |
Stokes flow approximation around the particle
ⓘ
linear shear flow assumption ⓘ |
| direction |
perpendicular to local flow direction
ⓘ
perpendicular to local shear gradient ⓘ |
| field |
aerosol dynamics
ⓘ
microfluidics ⓘ particle-laden flows ⓘ suspension mechanics ⓘ turbulent dispersion modeling ⓘ |
| firstDescribedIn | Journal of Fluid Mechanics ⓘ |
| firstPublishedIn | 1965 ⓘ |
| hasLimitation |
less accurate for highly non-spherical particles
ⓘ
less accurate for large particle Reynolds numbers ⓘ |
| influences |
cross-streamline migration of particles
ⓘ
particle dispersion in turbulent shear flows ⓘ particle focusing in channel flows ⓘ |
| mathematicallyDescribedBy | Saffman’s 1965 asymptotic solution for lift on a small sphere in shear flow ⓘ |
| namedAfter |
Philip G. Saffman
ⓘ
surface form:
Philip Geoffrey Saffman
|
| occursIn | shear flow ⓘ |
| proportionalTo |
fluid density
ⓘ
fluid viscosity to the power 1/2 ⓘ particle diameter squared ⓘ slip velocity between particle and fluid ⓘ square root of shear rate magnitude ⓘ |
| relatedTo |
Magnus lift force
ⓘ
Segré–Silberberg effect ⓘ inertial migration of particles ⓘ |
| usedIn |
design of microfluidic separation devices
ⓘ
modeling of particle migration in shear flows ⓘ prediction of particle trajectories in boundary layers ⓘ |
| validFor |
low shear Reynolds number
ⓘ
small particle Reynolds number ⓘ |
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: Saffman lift force Description of subject: The Saffman lift force is a hydrodynamic force acting on small particles in shear flow, causing them to migrate laterally due to velocity gradients in the surrounding fluid.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.