Sökning: "fiber suspension flow"

Visar resultat 1 - 5 av 26 avhandlingar innehållade orden fiber suspension flow.

  1. 1. Turbulence measurements in fiber suspension flows experimental methods and results

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

    Författare :Monika Carina Fällman; KTH.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fluid; flow; turbulent; turbulence; paper; pulp; fiber; fibre; suspension; two-phase; experimental; conductivity; micro-probes; passive scalar; ultrasonic; Doppler shift; TECHNOLOGY Engineering mechanics Fluid mechanics; TEKNIKVETENSKAP Teknisk mekanik Strömningsmekanik;

    Sammanfattning : Turbulent mixing is present in many pulp and paper processes. It is a particularly important factor in the design and improvements of the paper machine headbox, influencing the final paper structure. LÄS MER

  2. 2. Velocity measurements in a fiber suspension flow: formation of a fiber network

    Detta är en avhandling från Stockholm : KTH

    Författare :Gabriele Bellani; KTH.; KTH.; [2008]
    Nyckelord :Fluid mechanics; Fiber suspension; Fiber network; PIV; Index of Refraction; Digital image processing;

    Sammanfattning : The aim of the present work is to experimentally study the dynamics of the formation of a fiber network formed from the filtration of a fiber suspension. This is relevant for all industrial applications (e.g. papermaking, productions of composite material, etc. LÄS MER

  3. 3. Fibre flow mechanisms

    Detta är en avhandling från Stockholm : KTH

    Författare :Roger Bergström; KTH.; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fibre flow; floc; shear; compression; fibre network; stress chain; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Cellulose and paper engineering; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Cellulosa- och pappersteknik;

    Sammanfattning : The flow behaviour, and primarily the floc-floc interaction, of pulp paper suspensions have been studied visually. Analogy models based on these observations have been developed as well as the identification of important parameters of floc break-up in low shear rate flow fields. LÄS MER

  4. 4. A Model for Simulation of Fiber Suspension Flows

    Detta är en avhandling från Stockholm : Mekanik

    Författare :David Hammarström; KTH.; [2004]
    Nyckelord :rheology; fiber; suspension; CFD; model; wall; slip; turbulence;

    Sammanfattning : The fiber suspensions in the production line from wood topaper are subjected to many types of chemical and mechanicalprocesses, in which the flow of the suspension is of vitalimportance. The flow of the suspension determines the degree ofuniformity of the fibers through the processing, which inreturn affects the properties of the fiber suspension. LÄS MER

  5. 5. Simulation of the dynamics of fiber suspension flows

    Detta är en avhandling från Sundsvall : Mid Sweden University

    Författare :Stefan B Lindström; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fibre; fibre suspension; simulation; paper; papermaking; forming; fibre orientation distribution; fibre flexibility; viscosity; first normal stress difference; fluid flow; simple shear flow; two-way coupling; three-dimensional;

    Sammanfattning : A new model for simulating non-Brownian flexible fibres suspended in a Newtonian fluid has been developed. Special attention has been given to include realistic flow conditions found in the industrial papermaking process in the key features of the model; it is the intention of the author to employ the model in simulations of the forming section of the paper machine in future studies. LÄS MER