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Correlation and Verification of Homogenized Material Properties for Heat Exchanger Simulations by EMA and FEA
Blekinge Institute of Technology, School of Engineering.
2012 (English)Student thesisAlternative title
Correlation and Verification of Homogenized Material Properties for (Swedish)
Abstract [en]

Two heat exchangers from TitanX are used as test objects in this thesis. When FE-calculations are made by the simulation department at TitanX a method called “Homogenization Method” is used to simplify detail modelled fins of the heat exchangers by replacing them with very few blockshaped elements. Modal analyses are performed on the heat exchangers both experimentally and numerically (FE software). The results are used to check the validity of the “Homogenization Method” which is found to have a non-sufficient correlation with reality. Improved correlation of the homogenization method was found by changing the width of the brazed joints between tubes and fins to real measured values. The modeling of the tubes is briefly investigated and changed to correlate better with reality. The orthotropic material model that is used for the homogenized material in the FE-software is found to be insufficient to represent all the properties of the homogenized material.

Abstract [sv]

I detta Master-arbete används två kylare från TitanX som testobjekt. Då FE-beräkningar utförs på simuleringsavdelningen på TitanX görs en så kallad homogenisering. Metoden används för att förenkla kylarnas detaljmodellerade lameller (rankor) genom att ersätta dem med ett enda eller mycket få solidelement vilkas egenskaper motsvarar rankornas. Modalanalyser utförs på båda kylarna, både experimentella mätningar och numeriska FE-beräkningar. Resultatet från mätningarna används för att se hur väl homogeniseringsmetoden stämmer överens med verkligheten. Det visar sig att korrelationen med verkligheten inte är tillräckligt bra. Homogeniseringsmetoden uppdateras genom att mäta lödfogarna mellan rankor och rör och där efter implementera det uppmätta resultet i modelleringen av randvillkoren i homogeniseringsproceduren. Även modelleringen av rören i kylarna studeras samt materialmodellen som används i FE-beräkningarna. Den ortotropa materialmodell som är möjlig att använda i mjukvaran visar sig vara otillräcklig för att ge en fullständigt korrekt representation av rankorna efter homogenisering.

Place, publisher, year, edition, pages
2012. , 56 p.
Keyword [en]
Modal analysis, Homogenization, Heat exchanger, Fin, Orthotropic material model, Modalanalys, Homogenisering, Kylare, Ranka, Ortotropisk material modell
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:bth-5585Local ID: oai:bth.se:arkivex65F0ABFE3A73B57BC1257A05004151DDOAI: oai:DiVA.org:bth-5585DiVA: diva2:832970
Uppsok
Technology
Supervisors
Available from: 2015-04-22 Created: 2012-05-21 Last updated: 2015-06-30Bibliographically approved

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