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

11-4.7

Knudsen number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-4.7

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-11/t11-4.7
urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.7

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.7

IEC

urn:iec:std:iec:80000-11:2019:::item:11-4.7

Designations

ENKnudsen number

FRnombre de Knudsen

Symbol

K n

Notation systems

Rendered

K n

AsciiMath

Kn

LaTeX

K n

Definition

quotient of free path length of a particle and a characteristic length, expressed by

$K n = λ / l$ ; where

$λ$ :: is mean free path (ISO 80000-9: Physical chemistry and molecular physics), and

$l$ :: is characteristic length (ISO 80000-3: Space and time)

quotient du libre parcours moyen d'une particule par une longueur caractéristique, exprimé par:

$K n = λ / l$ ; où

$λ$ :: est le libre parcours moyen (ISO 80000-9: Physical chemistry and molecular physics); et

$l$ :: est la longueur caractéristique (ISO 80000-3: Space and time)

Notes

The Knudsen number is a measure to estimate whether the gas in flow behaves like a continuum.

The characteristic length, $l$ , can be a characteristic size of the gas flow region like a pipe diameter.

Le nombre de Knudsen est une mesure permettant d'estimer si le gaz qui s'écoule se comporte comme un milieu continu.

La longueur caractéristique, $l$ , peut être une dimension caractéristique de la zone d'écoulement du gaz, telle que le diamètre d'un tube.

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:t11-4.7

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-4.7
skosxl:prefLabel	"Knudsen number"@en
skosxl:altLabel	"Kn"@en
skos:definition	quotient of free path length of a particle and a characteristic length, expressed by stem:[Kn = lambda // l]; where st…
skos:note	The Knudsen number is a measure to estimate whether the gas in flow behaves like a continuum. The characteristic length…
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