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Visar resultat 1 - 5 av 111 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Mathematical and Experimental Study on Filtration of Solid Inclusions from Molten Aluminium and Steel

   Författare :Shahin Akbarnejad; Pär Jönsson; Dong-Yuan Sheng; Björn Glaser; Torbjörn Carlberg; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Filtration; Porous Media; Permeability; Water modeling; Fluid Bypassing; Stacked Filters; Ceramic Foam Filter; Monolithic Ceramic Filter; Alumina CFF; Particle Tracing; Aluminum Filtration; Steel Filtration; CFD; Alumina Inclusion; Filtrering; porösa medier; permeabilitet; vattenmodellering; vätskebypass; staplade filter; keramiskt skumfilter; monolitiskt keramiskt filter; aluminiumoxid CFF; partikelspårning; aluminiumfiltrering; stålfiltrering; CFD; aluminiumoxidinkludering; Materials Science and Engineering; Teknisk materialvetenskap;

   Sammanfattning : Aluminum and steel have been the most produced metal and alloy, respectively, for many years. Their extensive use in various industries, their fundamental role in our everyday life, and their excellent recycling characteristics are the major driving forces for development of their production towards more sustainable processes. LÄS MER

3. 2. Thermomechanical Processing of Nickel-Base Alloy 825

   Författare :Munir Al-Saadi; Pär Jönsson; Christopher Hulme-Smith; Göran Engberg; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Alloy 825; Cast and wrought structures; Hot compression test; Microstructural evaluation; Modelling; Yield strength; Strengthening mechanisms; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : Alloy 825 material was studied using a Gleeble-3800 thermosimulatorby performing single-hot compression experiments.Optical microscopy and electron backscatter diffraction wereutilized to characterize the microstructure. Dynamicrecrystallization is not considerable in the as-cast alloy anddislocation recovery is deemed to be dominant. LÄS MER

4. 3. Study of pyrolysis and gasification of biomass from the self-organization perspective

   Författare :Aliaksandr Alevanau; Ersson Mikael; Weihong Yang; Pär Jönsson; Sylwester Kalisz; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pyrolisys; pellets; hydrogen; gasification; Materials Science and Engineering; Teknisk materialvetenskap; Chemical Engineering; Kemiteknik;

   Sammanfattning : This thesis focuses on the analysis of kinetics of i) low-temperature pyrolysis of gaseous hydrocarbons, ii) high-temperature steam gasification of char of wood pellets (>700oC), iii) high temperature pyrolysis of straw pellets in an atmosphere of argon and steam, and iv) high temperature pyrolysis of slices of transversally cut wooden sticks. The results of the kinetic measurements in the high-temperature cases are approximated using a least-square based optimization software, which was specially developed to analyse kinetics prone for deviation from the Arrhenius law. LÄS MER

5. 4. Coupling of a fundamental mathematical fluid flow model with computational thermodynamics model to study the decarburisation

   Författare :Nils Å. I. Andersson; Pär Jönsson; Seppo Louhenkilpi; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : .... LÄS MER

7. 5. Numerical Study of the Gas Flow and Heat Transfer during Electromagnetic Stirring and Post Combustion in EAFs

   Författare :Niloofar Arzpeyma; Pär Jönsson; Dongyuan Sheng; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; EMS; EAF; post combustion; heat transfer; duct system;

   Sammanfattning : The effect of electromagnetic stirring on scrap melting and post combustion in two different electric arc furnaces (EAFs) have been studied using numerical modelling. The effect of electromagnetic stirring on melting of a piece of scrap located at the eccentric bottom tapping (EBT) region of an EAF has been studied. LÄS MER