Part 11: Characteristic Numbers·115 entries

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11-6.16

Bejan number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-6.16

https://metanorma.github.io/isq-smart/quantities/part-11/t11-6.16
urn:iso:std:iso:80000:-11:ed-2:en:item:11-6.16

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-6.16

IEC

urn:iec:std:iec:80000-11:2019:::item:11-6.16

Designations

ENBejan number

FRnombre de Bejan

Symbol

B e *

B e_{2}

Notation systems

Rendered

B e *

Rendered

B e_{2}

AsciiMath

Be**

AsciiMath

Be_2

LaTeX

B e \ast

LaTeX

B e_{2}

Definition

quotient of mechanical work and frictional and diffusion energy loss in viscous flow of fluids in pipes, expressed by

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

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

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

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

$D$ :: is diffusion coefficient (ISO 80000-9: Physical chemistry and molecular physics), mass diffusivity

quotient du travail mécanique par la perte d'énergie par frottement et par diffusion dans un écoulement visqueux de fluides dans des tubes, exprimé par:

$B e * = \frac{Δ p l^{2}}{η D}$ ; où

$Δ p$ :: est la chute de pression (ISO 80000-4: Mechanics) le long d'un tube ou d'un conduit;

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

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

$D$ :: est le coefficient de diffusion (ISO 80000-9: Physical chemistry and molecular physics), diffusivité massique

Notes

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

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

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:t11-6.16

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-6.16
skosxl:prefLabel	"Bejan number <mass transfer>"@en
skosxl:altLabel	"Be**"@en"Be_2"@en
skos:definition	quotient of mechanical work and frictional and diffusion energy loss in viscous flow of fluids in pipes, expressed by s…
skos:note	A similar quantity exists for heat transfer (<<t11-5.9>>).
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