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Kinetics of formation of a new phase in closed systems

Project goals

In present project, we would like to deal with the process of formation and growth of nuclei of a new phase from supersaturated mother phase. Basic kinetic equations describing such a process will be solved numerically and also we will try to find an approximate analytical solution using Greens function technique. Exhaustion of mother phase and nucleation sites (where formation of nuclei occurs) will be incorporated to our computation. Basic characteristic of nucleation process (nucleation rate, distribution function of nuclei of a new phase, time delay and the total number of nuclei formed during time of observation) will be determined and compared with experimental data in various considered systems (vapor-liquid, vapor-solid an liquid-solid phase transitions).

Keywords

phase transitionsnucleation kineticsclosed systems

Public support

  • Provider

    Academy of Sciences of the Czech Republic

  • Programme

    Grants of distinctly investigative character focused on the sphere of research pursued at present particularly in the Academy of Sciences of the Czech Republic

  • Call for proposals

    Výzkumné granty 3 (SAV02003-A)

  • Main participants

  • Contest type

    VS - Public tender

  • Contract ID

Alternative language

  • Project name in Czech

    Kinetika vzniku nové fáze v uzavřených systémech

  • Annotation in Czech

    V předkládaném projektu se chceme věnovat problematice vytváření a růstu zárodků nové fáze z přesycené matečné fáze. Základní kinetické rovnice popisující tento proces budou řešeny numericky a také se pokusíme najít přibližné analytické řešení použitím metody Greenových funkcí. Do našeho výpočtu zahrneme úbytek matečné fáze a nukleačních míst, na kterých nastává nukleace. Budou určeny základní charakteristiky nukleačního procesu (nukleační rychlost, rozdělovací funkce zárodků nové fáze, časová prodlevaa celkový počet zárodků) a porovnány s experimentálními údaji v různých systémech a získaných na různých pracovištích (fázové přechody pára-kapalina, pára-pevná látka, kapalina-pevná látka).

Scientific branches

  • R&D category

    ZV - Basic research

  • CEP classification - main branch

    BJ - Thermodynamics

  • CEP - secondary branch

    BM - Solid-state physics and magnetism

  • CEP - another secondary branch

    BE - Theoretical physics

  • 10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
    10302 - Condensed matter physics (including formerly solid state physics, supercond.)
    20303 - Thermodynamics

Completed project evaluation

  • Provider evaluation

    U - Uspěl podle zadání (s publikovanými či patentovanými výsledky atd.)

  • Project results evaluation

    Project is devoted to nucleation in closed systems including decrease of supersaturation due to phase transition. Discrepancies in process of formation of nuclei in comparison with standard model increase with increasing initial supersaturation.

Solution timeline

  • Realization period - beginning

    Jan 1, 2003

  • Realization period - end

    Jan 1, 2006

  • Project status

    U - Finished project

  • Latest support payment

Data delivery to CEP

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

  • Data delivery code

    CEP07-AV0-IA-U/03:3

  • Data delivery date

    Apr 3, 2009

Finance

  • Total approved costs

    4,996 thou. CZK

  • Public financial support

    1,177 thou. CZK

  • Other public sources

    2,546 thou. CZK

  • Non public and foreign sources

    1,273 thou. CZK

Basic information

Recognised costs

4 996 CZK thou.

Public support

1 177 CZK thou.

23%


Provider

Academy of Sciences of the Czech Republic

CEP

BJ - Thermodynamics

Solution period

01. 01. 2003 - 01. 01. 2006