Sökning: "heat release rate"

Visar resultat 1 - 5 av 66 avhandlingar innehållade orden heat release rate.

  1. 1. A model for heat and mass transfer in timber structures during fire: a theoretical, numerical and experimental study

    Detta är en avhandling från Lund University, Department of Fire Safety Engineering

    Författare :Bertil Fredlund; [1988]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wood; pyrolysis; temperature; pressure; moisture content; finite element method; mass flow; permeability; gamma-ray technique; specific heat; charring; rate of heat release; heat production;

    Sammanfattning : A model has been formulated for the pyrolysis of wood. This model includes heat and mass transfer. Heat transfer in the material is assumed to take place by thermal conduction and convection. Mass transfer of volatile pyrolysis products and water vapour occurs under the influlence of gradients in to tal pressure. LÄS MER

  2. 2. Processes in Optical Diesel Engines - Emissions Formation and Heat Release

    Detta är en avhandling från Lund University, Department of Fire Safety Engineering

    Författare :Ulf Aronsson; Lunds universitet.; Lund University.; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Diesel Engines; Optical Engines; Heat Release; Combustion; Emissions Formation; Mechanical Deformation;

    Sammanfattning : Popular Abstract in Swedish Dieselmotorn, uppkallad efter sin uppfinnare Rudolf Diesel, patenterades 1892 och har sedan dess bidragit väsentligt till utvecklingen av samhället. Den viktigaste användningen är som kraftkälla i fordon och detta användningsområde ökar fortfarande. LÄS MER

  3. 3. Fundamental studies of non-premixed combustion in turbulent wall jets using direct numerical simulation

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Zeinab Pouransari; KTH.; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulence; non-premixed combustion; global reaction; direct numerical simulation; wall-jet; heat release; mixing scales; heat transfer; TECHNOLOGY Engineering mechanics Other engineering mechanics; TEKNIKVETENSKAP Teknisk mekanik Övrig teknisk mekanik;

    Sammanfattning : The present thesis deals with the fundamental aspects of turbulent mixingand non-premixed combustion in wall-jet flows. Direct numerical simulations(DNS) of compressible turbulent flows are performed in a wall-jet configura-tion, which has a close resemblance to many industrial combustion applica-tions. LÄS MER

  4. 4. Melt flow and surface stability effects on polymer flammability : A study on polystyrene, flexible polyurethane foam and polyolefin composites

    Detta är en avhandling från Stockholm : KTH

    Författare :Roland H. Krämer; KTH.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Melt; flow; dripping; collapse; combustion; pool fire; feed‐back; gasification; heat release; flammability; nanocomposites; molar mass; intumescence; polyurethane; NATURAL SCIENCES Chemistry Organic chemistry Polymer chemistry; NATURVETENSKAP Kemi Organisk kemi Polymerkemi;

    Sammanfattning : Our ability to accurately determine the flammability properties of polymers is hampered bythe erratic effects of deformation and liquid flow that occur during polymer combustion.This study aims to improve the understanding of such effects at several levels:The often obvious impact of melt flow on standardized flammability test methods forelectrical appliances is described to identify the need and to motivate others to worktowards an improved material characterization. LÄS MER

  5. 5. On the Characteristics of Fires in Tunnels

    Detta är en avhandling från Department of Fire Safety Engineering and Systems Safety, Lund University

    Författare :Anders Lönnermark; Lunds universitet.; Lund University.; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; experiments; tunnel fire; heat release rate; temperature; fire spread; ventilation; backlayering; pulsations; thermoacoustic instability; equivalence ratio; emissions; gas concentrations; toxicity; Technological sciences; Teknik; Building construction; Byggnadsteknik; Road transport technology; Vägtransportteknik; Railway transport technology; Järnvägstransportteknik;

    Sammanfattning : Popular Abstract in Swedish I avhandlingen presenteras viktiga fenomen i samband med bränder i tunnlar. Detta baseras både på experimentellt och teoretiskt arbete. Tyngdpunkten ligger på de brandförsök i fullskala som genomfördes 2003 i Runehamartunneln i Norge. LÄS MER