Sökning: "Flow Uniformity"

Visar resultat 1 - 5 av 32 avhandlingar innehållade orden Flow Uniformity.

  1. 1. Flow Maldistribution in Exhaust Aftertreatment Systems - Numerical Simulations

    Författare :Pratheeba Chanda Nagarajan; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Catalyst; Flow maldistribution; Transient; CFD Simulations; Reactive flows; Uniformity Index; Exhaust AfterTreatment Systems;

    Sammanfattning : To comply with the stringent emission norms under every driving condition, including the coldstart conditions and Real Driving Emissions (RDE) tests, accurate models that capture the spatial and temporal variation of flow distribution information in Exhaust AfterTreatment Systems (EATS) are required. This study is aimed at characterizing and quantifying flow distribution in EATS under transient conditions with realistic geometry that illustrates the complex nature of the flow conditions. LÄS MER

  3. 2. Evaluation and modeling of the flow in a slotted wall wind tunnel

    Författare :Emil Ljungskog; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CFD Simulations; Ground Simulation; Uncertainty Quantification; Wind Tunnel; Tangential Blowing; Flow Uniformity; Slotted Walls;

    Sammanfattning : As vehicle manufacturers strive to shorten the development time of new models, an increasing share of the aerodynamic development work is shifted from wind tunnel testing of prototype vehicles to numerical simulations of virtual models. However, comparing measurements from the wind tunnel with numerical simulation data is not straightforward due to several interference effects occurring between the wind tunnel and the tested vehicle. LÄS MER

  4. 3. CFD in the design of gas quenching furnace

    Författare :Olivier Macchion; Said Zahrai; Bengt Sunden; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Numerical analysis; Gas quenching; modeling; CFD; gas mixtures; uniformity.; Numerisk analys; Numerical analysis; Numerisk analys;

    Sammanfattning : This thesis focuses on the numerical and theoretical studies of gas quenching in industrial furnaces. Gas quenching is the rapid cooling of metal pieces, aiming at forcing a phase transformation of the metal structure to improve its mechanical properties. LÄS MER

  5. 4. Colloidal synthesis of metal nanoparticles

    Författare :Anna Pekkari; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; inline quality control; palladium; gold; stabilizers; NO2 reduction; core-shell; colloidal synthesis; copper; reduction kinetics; platinum; nanoparticles; segmented flow; nanocube; flow chemistry;

    Sammanfattning : Metal nanoparticles (NPs) are central in a wide range of industrial areas including catalytic and biomedical applications. Due to their interesting physical properties, the demand of these precious materials is steadily increasing, which has created a need for the development of effective and high-performing NPs. LÄS MER

  7. 5. The influence of stress variations in wet pressing

    Författare :Jörgen Gullbrand; KTH; []
    Nyckelord :press felts; roughness; smoothness; surface structure; uniformity;

    Sammanfattning : Two methods for the measurement of micro-scale stressvariations of press felt surfaces were developed. The methodswere based on a thin plastic film that was coated with anopaque stress-sensitive layer (Cronapress conversion film). Thefilm was compressed between a felt and a smooth surface. LÄS MER