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

11-4.15

Bejan number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-4.15

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-11/t11-4.15
urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.15

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.15

IEC

urn:iec:std:iec:80000-11:2019:::item:11-4.15

Designations

ENBejan number

FRnombre de Bejan

Symbol

B e

Notation systems

Rendered

B e

AsciiMath

Be

LaTeX

B e

Definition

quotient of mechanical work and frictional energy loss in fluid dynamics in a pipe, expressed by

$B e = \frac{Δ p l^{2}}{η v} = \frac{ρ Δ p l^{2}}{η^{2}}$ ; where

$Δ p$ :: is drop of pressure (ISO 80000-4: Mechanics) along the pipe,

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

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

$v$ :: is kinematic viscosity (ISO 80000-4: Mechanics), and

$ρ$ :: is mass density (ISO 80000-4: Mechanics).

quotient du travail mécanique par la perte d'énergie par frottement en dynamique des fluides dans un tube, exprimé par:

$B e = \frac{Δ p l^{2}}{η v} = \frac{ρ Δ p l^{2}}{η^{2}}$ ; où

$Δ p$ :: est la chute de pression (ISO 80000-4: Mechanics) le long du tube;

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

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

$v$ :: est la viscosité cinématique (ISO 80000-4: Mechanics); et

$ρ$ :: est la masse volumique (ISO 80000-4: Mechanics)

Notes

A similar number exists for heat transfer (Bejan number <heat transfer>).

The kinematic viscosity is also called momentum diffusivity.

Un nombre similaire existe pour le transfert de chaleur (Bejan number <heat transfer>).

La viscosité cinématique est également appelée diffusivité de quantité de mouvement.

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:t11-4.15

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-4.15
skosxl:prefLabel	"Bejan number"@en
skosxl:altLabel	"Be"@en
skos:definition	quotient of mechanical work and frictional energy loss in fluid dynamics in a pipe, expressed by stem:[Be = (Delta p l^…
skos:note	A similar number exists for heat transfer (<<t11-5.9>>). The kinematic viscosity is also called momentum diffusivity.
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