Part 11: Characteristic Numbers·115 entries

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11-6.7

mass transfer factor, $j$ -factor

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-6.7

https://metanorma.github.io/isq-smart/quantities/part-11/t11-6.7
urn:iso:std:iso:80000:-11:ed-2:en:item:11-6.7

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-6.7

IEC

urn:iec:std:iec:80000-11:2019:::item:11-6.7

Designations

ENmass transfer factor

FRfacteur de transfert de masse

j

-factor

FRfacteur

j

Symbol

j *

Notation systems

Rendered

j *

AsciiMath

j**

LaTeX

j \ast

Definition

relation between mass transfer perpendicular to the surface of a fluid and mass transfer parallel to the surface in an open flow of fluids, expressed by

$j * = \frac{k}{v} {(\frac{v}{D})}^{2 / 3}$ ; where

$k$ :: is the mass transfer coefficient through the surface, $k = k' / ρ$ , where

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

$k'$ ::: 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),

$v$ :: is speed (ISO 80000-3: Space and time),

$v$ :: is kinematic viscosity (ISO 80000-4: Mechanics), and

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

relation entre la masse transférée perpendiculairement à la surface d'un fluide et la masse transférée parallèlement à la surface dans un écoulement libre de fluides, exprimée par:

$j * = \frac{k}{v} {(\frac{v}{D})}^{2 / 3}$ ; où

$k$ :: est le coefficient de transfert de masse à travers la surface, $k = k' / ρ$ , où

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

$k'$ ::: 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);

$v$ :: est la vitesse (ISO 80000-3: Space and time);

$v$ :: est la viscosité cinématique (ISO 80000-4: Mechanics); et

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

Notes

The mass transfer factor is also given by

$j_{m} = j * = S t * \cdot S c^{2 / 3}$ ; where

$S t *$ :: is the Stanton number for mass transfer (Stanton number <mass transfer>), and

$S c$ :: is the Schmidt number (Schmidt number).

See also heat transfer factor (heat transfer number).

Le facteur de transfert de masse est également donné par:

$j_{m} = j * = S t * \cdot S c^{2 / 3}$ ; où

$S t *$ :: est le nombre de Stanton pour le transfert de masse (Stanton number <mass transfer>); et

$S c$ :: est le nombre de Schmidt (Schmidt number).

Voir aussi le facteur de transfert de chaleur (heat transfer number).

Referenced by

stem:[j]-factor <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:t11-6.7

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-6.7
skosxl:prefLabel	"mass transfer factor"@en
skosxl:altLabel	"stem:[j]-factor <mass transfer>"@en"j**"@en
skos:definition	relation between mass transfer perpendicular to the surface of a fluid and mass transfer parallel to the surface in an o…
skos:note	The mass transfer factor is also given by stem:[j_m = j = St * Sc^(2//3)]; where stem:[St**]:: is the Stanton numb…
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