Part 11: Characteristic Numbers·115 entries

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Section 11-442 entries

11-4.1Reynolds number 11-4.2Euler number 11-4.3Froude number 11-4.4Grashof number 11-4.5Weber number 11-4.6Mach number 11-4.7Knudsen number 11-4.8Strouhal number, Thomson number 11-4.9drag coefficient 11-4.10Bagnold number 11-4.11Bagnold number <solid particles>11-4.12lift coefficient 11-4.13thrust coefficient 11-4.14Dean number 11-4.15Bejan number 11-4.16Lagrange number 11-4.17Bingham number, plasticity number 11-4.18Hedström number 11-4.19Bodenstein number 11-4.20Rossby number, Kiebel number 11-4.21Ekman number 11-4.22elasticity number 11-4.23Darcy friction factor, Moody friction factor 11-4.24Fanning number 11-4.25Goertler number, Goertler parameter 11-4.26Hagen number 11-4.27Laval number 11-4.28Poiseuille number 11-4.29power number 11-4.30Richardson number 11-4.31Reech number 11-4.32Stokes number <time-related>11-4.33Stokes number <vibrating particles>11-4.34Stokes number <rotameter>, power coefficient <rotameter>11-4.35Stokes number <gravity>11-4.36Stokes number <drag>11-4.37Laplace number, Suratman number 11-4.38Blake number 11-4.39Sommerfeld number 11-4.40Taylor number <momentum transfer>11-4.41Galilei number 11-4.42Womersley number

11-4.39

Sommerfeld number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-4.39

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-11/t11-4.39
urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.39

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.39

IEC

urn:iec:std:iec:80000-11:2019:::item:11-4.39

Designations

ENSommerfeld number

FRnombre de Sommerfeld

Symbol

S o

S m

Notation systems

Rendered

S o

Rendered

S m

AsciiMath

So

AsciiMath

Sm

LaTeX

S o

LaTeX

S m

Definition

relation between viscous force and load force in a lubrication boundary, expressed by

$S o = \frac{η n}{p} {(\frac{r}{c})}^{2}$ ; where

$η$ :: is dynamic viscosity (ISO 80000-4: Mechanics) of the lubricant,

$n$ :: is rotational frequency (ISO 80000-3: Space and time),

$p$ :: is mean bearing pressure (ISO 80000-4: Mechanics),

$r$ :: is radius (ISO 80000-3: Space and time) of the shaft, and

$c$ :: is radial distance (ISO 80000-3: Space and time) between rotating shaft and annulus

relation entre la force visqueuse et la force de charge en lubrification limite, exprimée par:

$S o = \frac{η n}{p} {(\frac{r}{c})}^{2}$ ; où

$η$ :: est la viscosité dynamique (ISO 80000-4: Mechanics) du lubrifiant;

$n$ :: est la fréquence de rotation (ISO 80000-3: Space and time);

$p$ :: est la pression (ISO 80000-4: Mechanics) moyenne sur le palier;

$r$ :: est le rayon (ISO 80000-3: Space and time) de l'arbre; et

$c$ :: est la distance radiale (ISO 80000-3: Space and time) entre l'arbre en rotation et l'espace annulaire

Notes

Sometimes the inverse of this number is wrongly used.

Parfois, l'inverse de ce nombre est utilisé à tort.

Concept HierarchyPendrill (2024)

1dimensionless quantitiesLevel 0 · Kind

Broader concepts

◇ dimensionless quantities

Ontology
isq:Quantity smart:TermEntry

Class Hierarchy

smart:Entity smart:TermEntryisq:Quantity

A physical quantity as defined in ISO/IEC 80000, with associated symbols, definitions, and units of measurement.

Instance IRI

isq:t11-4.39

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-4.39
skosxl:prefLabel	"Sommerfeld number"@en
skosxl:altLabel	"So"@en"Sm"@en
skos:definition	relation between viscous force and load force in a lubrication boundary, expressed by stem:[So = (eta n)/p (r/c)^2]; wh…
skos:note	Sometimes the inverse of this number is wrongly used.
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-11

Related Entities

isq:QuantityShape isq:part-11 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry