Sökning: "Konvektion"

Visar resultat 11 - 15 av 64 uppsatser innehållade ordet Konvektion.

  1. 11. Modelling of Laser Welding of Aluminium using COMSOL Multiphysics

    Master-uppsats, KTH/Materialvetenskap

    Författare :Jie Chen; [2020]
    Nyckelord :laser welding process; aluminium alloy; thermal-mechanical; COMSOL Multiphysics; hot cracking; thermal model; CFD model; mechanical model; Marangoni effect; lasersvetsningsprocess; aluminiumlegeringar; termisk-mekanisk; COMSOL-flerfysik; hetsprickning; termisk modell; CFD-modell; mekanisk modell; Marangoni-effekt;

    Sammanfattning : This thesis presents a modelling approach of laser welding process of aluminium alloy from the thermo-mechanical point of view to evaluate the occurrence of hot cracking based on simulation results and relevant criteria. The model was created stepwise in COMSOL Multiphysics, starting with the thermal model where heat conduction of solid and liquid phase was computed. LÄS MER

  3. 12. Fuktsäkerhet i ventilerade parallelltak

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Avdelningen för Byggnadsfysik

    Författare :Gabriel Odén; Gustav Månhardt; [2020]
    Nyckelord :Parallelltak; WUFI; blinda beräkningar; varierad luftomsättning; luftflödesmodell; fuktsäkerhet; MRD; termisk drivkraft; klimatdata; ventilerad luftspalt; värme och fukttransport; konvektion; analytisk lösning; fallstudie; Technology and Engineering;

    Sammanfattning : Parallel roofs are commonly used in Sweden when constructing new small house buildings and are also difficult to access for inspection. Furthermore, high demands are set in the Swedish building regulations, although there are no clear guidelines for their compliance. LÄS MER

  4. 13. Investigation of Emission Source Heights in FLEXPART 10.02 for the Wildfire in Pedrógão Grande, Portugal, 2017

    Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Anton Nygren; [2019]
    Nyckelord :wildfire; Pedrógão Grande; structural similarity; SSIM; FLEXPART; MERRA2; CO; emission source height; skogsbränder; Pedrógão Grande; strukturell likhet; SSIM; FLEXPART; MERRA2; CO; utsläppshöjd;

    Sammanfattning : One of the worst wildfires in Portugal in 2017 on June17- 21 started at the central part of Pedrógão Grande and spread fast to the surrounding areas Góis, Pampilhosa da Serra and Arganil. The wildfire took 64 lives and a large smoke plume was observed. LÄS MER

  5. 14. Solcellers effektivitet vid integrerat eller applicerat montage

    Master-uppsats, Karlstads universitet/Avdelningen för energi-, miljö- och byggteknik

    Författare :August Larsson; [2019]
    Nyckelord :BIPV; air cavity; naturally convection; BIPV; luftspalt; skorstenseffekten; naturlig konvektion;

    Sammanfattning : Sweden has a climate target to get a total renewable electricity production by 2040, in order to succeed with the goal, the proportion of solar energy needs to increase. Increased environmental awareness and increased profitability of solar cells have led to an increase. LÄS MER

  7. 15. Design benefits with Additive Manufacturingfrom a convective heat transfer perspective

    Master-uppsats, KTH/Flygdynamik

    Författare :Joakim Storfeldt; [2019]
    Nyckelord :;

    Sammanfattning : Nowadays manufacturing processes are rapidly developing. Salt-bath dip brazing is a conventional manufacturing method commonly used by Saab AB to fuse aluminium components in a high temperature salt bath. However conventional manufacturing methods have shown some limitations. LÄS MER