Part 11: Characteristic Numbers·115 entries

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11-6.4

Nusselt number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-6.4

https://metanorma.github.io/isq-smart/quantities/part-11/t11-6.4
urn:iso:std:iso:80000:-11:ed-2:en:item:11-6.4

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-6.4

IEC

urn:iec:std:iec:80000-11:2019:::item:11-6.4

Designations

ENNusselt number

FRnombre de Nusselt

Symbol

N u *

Notation systems

Rendered

N u *

AsciiMath

N u**

LaTeX

N u \ast

Definition

relation between mass flux at an interface and specific flux by pure molecular diffusion in a layer of thickness $l$ for mass transfer at the boundary of a fluid, expressed by

$N u * = k' l / (ρ D)$ ; where

$k'$ :: is mass flux density $q_{m} / A$ through the surface, where

$q_{m}$ ::: is mass flow rate (ISO 80000-4: Mechanics), and

$A$ ::: is area (ISO 80000-3: Space and time),

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

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

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

relation entre le flux de masse au niveau d'une interface et le flux spécifique par diffusion moléculaire pure dans une couche d'épaisseur $l$ dans le contexte du transfert de masse à la limite d'un fluide, exprimée par:

$N u * = k' l / (ρ D)$ ; où

$k'$ :: est le débit-masse surfacique $q_{m} / A$ à travers la surface; où

$q_{m}$ ::: est le débit-masse (ISO 80000-4: Mechanics); et

$A$ ::: est l'aire (ISO 80000-3: Space and time);

$l$ :: est l'épaisseur (ISO 80000-3: Space and time);

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

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

Notes

Sometimes this quantity is called the Sherwood number, $S h$ . +

Compare with Nusselt number <heat transfer>, Nusselt number for heat transfer.

Parfois, cette grandeur est appelée nombre de Sherwood, $S h$ .

Comparer avec Nusselt number <heat transfer>, nombre de Nusselt pour transfert de chaleur.

Referenced by

Stanton 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:t11-6.4

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-6.4
skosxl:prefLabel	"Nusselt number <mass transfer>"@en
skosxl:altLabel	"N u**"@en
skos:definition	relation between mass flux at an interface and specific flux by pure molecular diffusion in a layer of thickness stem:[l…
skos:note	Sometimes this quantity is called the Sherwood number, stem:[Sh]. + Compare with <<t11-5.5>>, Nusselt number for heat t…
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