← Class ReferenceReferência de Classes
exported equivalent COPI_0000253
Diffuser
IRI: https://www.inf.ufrgs.br/ontologies/copi/COPI_0000253
Generated onGerado em 2026-04-16
Natural Language DefinitionDefinição em Linguagem Natural
EN
A diffuser is an assembly that has the designed function of converting kinetic energy of fluid flow into pressure energy through controlled deceleration in a diverging passage.
PT-BR
Um difusor é um conjunto que tem a função projetada de converter energia cinética do fluxo de fluido em energia de pressão através de desaceleração controlada em uma passagem divergente.
Formal AxiomsAxiomas Formais
Semi-formal (Aristotelian)Semi-formal (Aristotélico)
Every diffuser is an assembly that bears an energy diffusion function and has a diverging channel as component part at all times.
First-Order Logic TheoryTeoria em Lógica de Primeira Ordem
[Definition]∀x (Diffuser(x) ↔ Assembly(x) ∧ ∃f (EnergyDiffusionFunction(f) ∧ bearerOf(x,f))) — Steps 1–3: genus + identity-giving function [Function axiom: EnergyDiffusionFunction]∀f (EnergyDiffusionFunction(f) → ∀p (realizedIn(f,p) → EnergyDiffusionProcess(p)) ∧ ∃p (EnergyDiffusionProcess(p) ∧ realizedIn(f,p))) — Step 1: ∀ preserves type-type identity; ∃ rules out vacuous functions never realised [Necessary part: DivergingChannel]∀x (Diffuser(x) → ∃p (DivergingChannel(p) ∧ hasComponentPartAtAllTimes(x,p))) — Step 4: mereological commitment — every instance must have this part [Process participation signature]∀x ∀f ((Diffuser(x) ∧ EnergyDiffusionFunction(f) ∧ bearerOf(x,f)) → ∃m (FluidPortion(m) ∧ participatesIn(m,f)) ∧ ∃e (FluidPortion(e) ∧ participatesIn(e,f)) ∧ processType(f,PressureIncrease)) — Step 5: typed participants in the realising process
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> . @prefix : <https://www.inf.ufrgs.br/ontologies/copi/> . @prefix owl: <http://www.w3.org/2002/07/owl#> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . @prefix bfo: <http://purl.obolibrary.org/obo/> . @prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> . @prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> . @prefix skos: <http://www.w3.org/2004/02/skos/core#> . @prefix qudt: <http://qudt.org/schema/qudt/> . @prefix dcterms: <http://purl.org/dc/terms/> . @prefix foaf: <http://xmlns.com/foaf/0.1/> . @prefix apv: <http://inf.ufrgs.br/ontologies/apv#> . ### COPI — Core Ontology for Petroleum Installations ### Class module: Diffuser <https://www.inf.ufrgs.br/ontologies/copi> rdf:type owl:Ontology ; dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ; dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ; dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ; skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ; skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ; skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ; skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ; owl:versionInfo "1.1.0-104-g4d16eff" ; owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ; owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ; dcterms:creator "Nicolau Oyhenard dos Santos"@en ; dcterms:contributor "Cauã Antunes" ; dcterms:contributor "Haroldo Rojas" ; dcterms:contributor "Rafael Petry" ; dcterms:contributor "Régis Romeu" ; dcterms:contributor "Mara Abel" ; dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ; dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ; dcterms:license <https://creativecommons.org/licenses/by/4.0/> ; dcterms:created "2026-04-08"^^xsd:date ; dcterms:modified "2026-07-13"^^xsd:date ; apv:GlobalMinLanguageCoverage "en pt-br" ; apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ; apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" . iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ; apv:MinAnnotationLength 20 . ### Identity-giving function :EnergyDiffusionFunction rdf:type owl:Class ; rdfs:subClassOf iof-core:DesignedFunction ; rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty bfo:BFO_0000054 ; # realizedIn owl:allValuesFrom :EnergyDiffusionProcess ] ; rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty bfo:BFO_0000054 ; # realizedIn owl:someValuesFrom :EnergyDiffusionProcess ] ; rdfs:label "energy diffusion function"@en ; rdfs:label "função de difusão de energia"@pt-br . ### Process type :EnergyDiffusionProcess rdf:type owl:Class ; rdfs:subClassOf iof-core:PlannedProcess ; rdfs:label "energy diffusion process"@en ; rdfs:label "processo de difusão de energia"@pt-br . :EnergyDiffusionProcess rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty iof-core:hasInput ; owl:someValuesFrom :FluidPortion ] ; rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty iof-core:hasSpecifiedOutput ; owl:someValuesFrom :FluidPortion ] . ### Equipment universal: Diffuser :Diffuser rdf:type owl:Class ; owl:equivalentClass [ rdf:type owl:Class ; owl:intersectionOf ( iof-core:Assembly [ rdf:type owl:Restriction ; owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart) owl:someValuesFrom :EnergyDiffusionFunction ] [ rdf:type owl:Restriction ; owl:onProperty iof-core:hasComponentPartAtAllTimes ; owl:someValuesFrom :DivergingChannel ] ) ] ; rdfs:label "diffuser"@en ; rdfs:label "difusor"@pt-br ; iof-av:naturalLanguageDefinition "A diffuser is an assembly that has the designed function of converting kinetic energy of fluid flow into pressure energy through controlled deceleration in a diverging passage."@en ; skos:definition "A diffuser is an assembly that has the designed function of converting kinetic energy of fluid flow into pressure energy through controlled deceleration in a diverging passage."@en ; iof-av:naturalLanguageDefinition "Um difusor é um conjunto que tem a função projetada de converter energia cinética do fluxo de fluido em energia de pressão através de desaceleração controlada em uma passagem divergente."@pt-br ; iof-av:semiFormalNaturalLanguageAxiom "Every diffuser is an assembly that bears an energy diffusion function and has a diverging channel as component part at all times."@en ; iof-av:firstOrderLogicAxiom "∀x(Diffuser(x) ↔ Assembly(x) ∧ ∃f(EnergyDiffusionFunction(f) ∧ bearerOf(x,f)))"@en ; :DivergingChannel rdf:type owl:Class ; rdfs:subClassOf iof-core:MaterialArtifact ; rdfs:label "canal divergente"@pt-br ; rdfs:label "diverging channel"@en . # Disjointness: Diffuser and Nozzle [] rdf:type owl:AllDisjointClasses ; owl:members ( :Diffuser :Nozzle ) .
Axiomatization Decision LogRegistro de Decisões
1 Identity-Giving FunctionFunção Identitária
Function class
EnergyDiffusionFunction ⊑ DesignedFunction
Realized in
EnergyDiffusionProcess ⊑ PlannedProcess
The identity-giving function is the conversion of kinetic energy to pressure energy (potential energy) in fluid flows. This is what makes a diffuser a diffuser across all contexts - pumps, HVAC, turbomachinery, etc. The function is realized through controlled deceleration of fluid in a diverging passage.
2 Genus DeterminationDeterminação do Gênero
Assemblybfo:Object (BFO_0000030)
From the parent candidates, FunctionalObject is too abstract and 'other mechanical equipment' is not a proper ontological class. Diffuser is a mechanical component with multiple parts (typically housing, diverging channel walls, possibly vanes or guide elements) that work together as a causally unified assembly. It's procured, maintained, and operated as a single unit despite having internal structure.
3 Differentia SpecificaDiferença Específica
∃bearerOf.EnergyDiffusionFunction

A diffuser is distinguished from other assemblies by its designed function to convert kinetic energy in fluid flow to pressure energy through controlled deceleration.

The energy conversion function is the minimal differentiating condition. All diffusers perform this specific thermodynamic transformation regardless of application context (pump, compressor, HVAC, etc.).
4 Necessary PartsPartes Necessárias
Part classParentRelation
DivergingChannelMaterialArtifacthasComponentPartAtAllTimes
These parts are universal - any device performing energy diffusion must have a diverging geometry and flow guidance elements, though specific implementations vary by application.
Process Participation SignatureAssinatura de Participação em Processo
InputsEntradas
{'type': 'FluidPortion', 'count': 1, 'constraints': 'high kinetic energy, low pressure'}
OutputsSaídas
{'type': 'FluidPortion', 'count': 1, 'constraints': 'low kinetic energy, high pressure'}
TransformationTransformação
kinetic energy converted to pressure energy through controlled fluid deceleration
The signature captures the essential energy transformation - single fluid stream with kinetic energy reduced and pressure energy increased, maintaining mass conservation but transforming energy state.
Disjoint WithDisjunto com
Nozzle
C4: Nozzle. Nozzle performs opposite transformation (pressure to kinetic energy), Venturi creates pressure drop rather than pressure rise. These represent incompatible energy transformation signatures.
MetadataMetadados
COPI IDCOPI IDCOPI_0000253
IRIIRIhttps://www.inf.ufrgs.br/ontologies/copi/COPI_0000253
StatusStatusexported
Axiom modeModoequivalent
CreatedCriado2026-04-16
UpdatedAtualizado2026-06-28
LLM modelModelo LLMclaude-sonnet-4-20250514
VersionVersão2026-07-13
Quick factsDados rápidos
GenusGêneroAssembly
Root classClasse raizAssembly
Axiom modeModoequivalent
FunctionFunçãoEnergyDiffusionFunction
ProcessProcessoEnergyDiffusionProcess
PartsPartes1
Source DefinitionsDefinições nas Fontes 2 sources
ISO 15926-4 DIFFUSER
Definition text withheld (copyrighted standard) — follow the source link above.Texto da definição omitido (norma protegida por direitos autorais) — acesse o link da fonte acima.
CFIHOS diffuser
Definition text withheld (copyrighted standard) — follow the source link above.Texto da definição omitido (norma protegida por direitos autorais) — acesse o link da fonte acima.