Part 11: Characteristic Numbers·115 entries

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11-5.9

Bejan number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-5.9

https://metanorma.github.io/isq-smart/quantities/part-11/t11-5.9
urn:iso:std:iso:80000:-11:ed-2:en:item:11-5.9

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-5.9

IEC

urn:iec:std:iec:80000-11:2019:::item:11-5.9

Designations

ENBejan number

FRnombre de Bejan

Symbol

B e_{1}

Notation systems

Rendered

B e_{1}

AsciiMath

Be_1

LaTeX

B e_{1}

Definition

quotient of mechanical work and frictional and thermal diffusion energy losses for a forced flow, expressed by

$B e_{1} = \frac{Δ p l^{2}}{η α}$ ; where

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

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

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

$α$ :: is thermal diffusivity (ISO 80000-5: Thermodynamics)

quotient du travail mécanique par les pertes d'énergie par frottement et par diffusion thermique pour un écoulement pulsé, exprimé par:

$B e_{1} = \frac{Δ p l^{2}}{η α}$ ; où

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

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

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

$α$ :: est la diffusivité thermique (ISO 80000-5: Thermodynamics)

Referenced by

Bejan number Bejan number <mass 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:t11-5.9

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-5.9
skosxl:prefLabel	"Bejan number <heat transfer>"@en
skosxl:altLabel	"Be_1"@en
skos:definition	quotient of mechanical work and frictional and thermal diffusion energy losses for a forced flow, expressed by stem:[Be…
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