Part 11: Characteristic Numbers·115 entries

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Section 11-442 entries

11-4.1Reynolds number 11-4.2Euler number 11-4.3Froude number 11-4.4Grashof number 11-4.5Weber number 11-4.6Mach number 11-4.7Knudsen number 11-4.8Strouhal number, Thomson number 11-4.9drag coefficient 11-4.10Bagnold number 11-4.11Bagnold number <solid particles>11-4.12lift coefficient 11-4.13thrust coefficient 11-4.14Dean number 11-4.15Bejan number 11-4.16Lagrange number 11-4.17Bingham number, plasticity number 11-4.18Hedström number 11-4.19Bodenstein number 11-4.20Rossby number, Kiebel number 11-4.21Ekman number 11-4.22elasticity number 11-4.23Darcy friction factor, Moody friction factor 11-4.24Fanning number 11-4.25Goertler number, Goertler parameter 11-4.26Hagen number 11-4.27Laval number 11-4.28Poiseuille number 11-4.29power number 11-4.30Richardson number 11-4.31Reech number 11-4.32Stokes number <time-related>11-4.33Stokes number <vibrating particles>11-4.34Stokes number <rotameter>, power coefficient <rotameter>11-4.35Stokes number <gravity>11-4.36Stokes number <drag>11-4.37Laplace number, Suratman number 11-4.38Blake number 11-4.39Sommerfeld number 11-4.40Taylor number <momentum transfer>11-4.41Galilei number 11-4.42Womersley number

11-4.23

Darcy friction factor, Moody friction factor

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-4.23

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-11/t11-4.23
urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.23

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-4.23

IEC

urn:iec:std:iec:80000-11:2019:::item:11-4.23

Designations

ENDarcy friction factor

FRcoefficient de frottement de Darcy

ENMoody friction factor

FRcoefficient de frottement de Moody

Symbol

f_{D}

Notation systems

Rendered

f_{D}

AsciiMath

f_"D"

LaTeX

f_{\text{D}}

Definition

representation of pressure loss in a pipe due to friction within a laminar or turbulent flow of a fluid in a pipe, expressed by

$f_{D} = \frac{2 Δ p}{ρ v^{2}} \frac{d}{l}$ ; where

$Δ p$ :: is drop of pressure (ISO 80000-4: Mechanics) due to friction,

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

$v$ :: is (average) speed (ISO 80000-3: Space and time) of the fluid in the pipe,

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

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

représentation de la chute de pression dans un tube due au frottement dans le contexte d'un écoulement laminaire ou turbulent d'un fluide dans un tube, exprimée par:

$f_{D} = \frac{2 Δ p}{ρ v^{2}} \frac{d}{l}$ ; où

$Δ p$ :: est la chute de pression (ISO 80000-4: Mechanics) due au frottement;

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

$v$ :: est la vitesse (moyenne) (ISO 80000-3: Space and time) du fluide dans le tube;

$d$ :: est le diamètre (ISO 80000-3: Space and time) du tube; et

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

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:t11-4.23

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-4.23
skosxl:prefLabel	"Darcy friction factor"@en
skosxl:altLabel	"Moody friction factor"@en"f_"D""@en
skos:definition	representation of pressure loss in a pipe due to friction within a laminar or turbulent flow of a fluid in a pipe, expre…
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