Part 11: Characteristic Numbers·115 entries

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11-5.18

Pomerantsev number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-5.18

https://metanorma.github.io/isq-smart/quantities/part-11/t11-5.18
urn:iso:std:iso:80000:-11:ed-2:en:item:11-5.18

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-5.18

IEC

urn:iec:std:iec:80000-11:2019:::item:11-5.18

Designations

ENPomerantsev number

FRnombre de Pomerantsev

Symbol

P o

P o v

Notation systems

Rendered

P o

Rendered

P o v

AsciiMath

Po

AsciiMath

Pov

LaTeX

P o

LaTeX

P o v

Definition

relation between heat generated in a body and conducted heat in the body, expressed by

$P o = Q_{m} l^{2} / (λ Δ T)$ ; where

$Q_{m}$ :: is (constant) volumic heat generation rate,

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

$λ$ :: is thermal conductivity (ISO 80000-5: Thermodynamics), and

$Δ T = T_{m} - T_{0}$ :: is difference of thermodynamic temperature (ISO 80000-5: Thermodynamics) between that of the medium ( $T_{m}$ ) and the initial temperature of the body ( $T_{0}$ )

relation entre la chaleur générée dans un corps et la chaleur transférée par conduction dans le corps, exprimée par:

$P o = Q_{m} l^{2} / (λ Δ T)$ ; où

$Q_{m}$ :: est le débit (constant) de génération de chaleur volumique;

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

$λ$ :: est la conductivité thermique (ISO 80000-5: Thermodynamics); et

$Δ T = T_{m} - T_{0}$ :: est la différence de température thermodynamique (ISO 80000-5: Thermodynamics) entre celle du milieu ( $T_{m}$ ) et la température initiale du corps ( $T_{0}$ )

Notes

Similar numbers are known for areic, lineic and point sources of heat, each with decreasing power of length $l$ respectively.

Des nombres similaires sont connus pour des sources de chaleur surfaciques, linéiques et ponctuelles, chacune ayant respectivement une puissance décroissante de la longueur $l$ .

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:t11-5.18

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-5.18
skosxl:prefLabel	"Pomerantsev number <heat transfer>"@en
skosxl:altLabel	"Po"@en"Pov"@en
skos:definition	relation between heat generated in a body and conducted heat in the body, expressed by stem:[Po = Q_"m" l^2 // (lambda …
skos:note	Similar numbers are known for areic, lineic and point sources of heat, each with decreasing power of length stem:[l] res…
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