Part 11: Characteristic Numbers·115 entries

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11-5.5

Nusselt number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-5.5

https://metanorma.github.io/isq-smart/quantities/part-11/t11-5.5
urn:iso:std:iso:80000:-11:ed-2:en:item:11-5.5

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-5.5

IEC

urn:iec:std:iec:80000-11:2019:::item:11-5.5

Designations

ENNusselt number

FRnombre de Nusselt

Symbol

N u

Notation systems

Rendered

N u

AsciiMath

N u

LaTeX

N u

Definition

relation between the internal thermal resistance of a body and its surface thermal resistance in a body transferring heat from a surface into its interior or vice versa, expressed by

$N$

$u = K l / λ = K l / (α ρ c_{p})$ where

$K$ :: is coefficient of heat transfer (ISO 80000-5: Thermodynamics) through the surface,

$l$ :: is length (ISO 80000-3: Space and time) of the body in direction of heat flow,

$λ$ :: is thermal conductivity (ISO 80000-5: Thermodynamics) of the surface,

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

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

$c_{p}$ :: is specific heat capacity at constant pressure (ISO 80000-5: Thermodynamics)

relation entre la résistance thermique interne d'un corps et sa résistance thermique superficielle dans le contexte du transfert de chaleur de la surface vers l'intérieur d'un corps ou inversement, exprimée par:

$N$

$u = K l / λ = K l / (α ρ c_{p})$ où

$K$ :: est le coefficient de transmission thermique (ISO 80000-5: Thermodynamics) à travers la surface;

$l$ :: est la longueur (ISO 80000-3: Space and time) du corps dans la direction du flux thermique;

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

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

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

$c_{p}$ :: est la capacité thermique massique à pression constante (ISO 80000-5: Thermodynamics)

Notes

The body under consideration can be a solid body, a fluid, or their combination, and additional heat transfer due to convective motion can occur.

In case of merely conductive heat transfer especially in a solid body, the "Biot number for heat transfer" (Biot number <heat transfer>) is used.

Le corps considéré peut être un corps solide, un fluide ou une combinaison des deux, et un transfert de chaleur supplémentaire dû à un mouvement de convection peut se produire.

Dans le cas d'un simple transfert de chaleur par conduction, notamment dans un corps solide, le «nombre de Biot pour transfert de chaleur» (Biot number <heat transfer>) est utilisé.

Referenced by

Biot number <heat transfer>Stanton number <heat transfer>Nusselt 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:t11-5.5

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-5.5
skosxl:prefLabel	"Nusselt number <heat transfer>"@en
skosxl:altLabel	"N u"@en
skos:definition	relation between the internal thermal resistance of a body and its surface thermal resistance in a body transferring hea…
skos:note	The body under consideration can be a solid body, a fluid, or their combination, and additional heat transfer due to con…
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