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    Wyświetlanie 1-4 z 4
    Tytuł:
    Chaotic air pressure fluctuations during departure of air bubbles from two neighbouring nozzles
    Autorzy:
    Mosdorf, R.
    Wyszkowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240151.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamika
    dynamika chaotyczna
    pęcherze
    bubble chain
    bubble dynamics
    chaotic dynamics
    Opis:
    In the experiment, bubbles were generated from two brass nozzles with inner diameters of 1.1 mm. They were submerged in the glass tank filled with distilled water. There have been measured the air pressure fluctuations and the signal from the laser-phototransistor sensor. For analysis of the pressure signal the correlation (the normalized cross - correlation exponent) and non-linear analyses have been used. It has been shown that hydrodynamic interactions between bubbles can lead to bubble departure synchronization. In this case the bubble departures become periodic. The results of calculation of correlation dimension and the largest Lyapunov exponent confirm that hydrodynamic bubble interactions observed for 4 mm spacing between nozzels cause the periodic bubble departures from two neighbouring nozzles.
    Źródło:
    Archives of Thermodynamics; 2012, 33, 1; 123-137
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics, control, stability, diffusion and synchronization of modified chaotic Colpitts oscillator
    Autorzy:
    Rasappan, Suresh
    Niranjan Kumar, K. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1845536.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chaos
    Colpitts oscillator
    Lyapunov exponent
    diffusion
    stability
    synchronization
    Opis:
    The purpose of this paper is to introduce a new chaotic oscillator. Although different chaotic systems have been formulated by earlier researchers, only a few chaotic systems exhibit chaotic behaviour. In this work, a new chaotic system with chaotic attractor is introduced. It is worth noting that this striking phenomenon rarely occurs in respect of chaotic systems. The system proposed in this paper has been realized with numerical simulation. The results emanating from the numerical simulation indicate the feasibility of the proposed chaotic system. More over, chaos control, stability, diffusion and synchronization of such a system have been dealt with.
    Źródło:
    Archives of Control Sciences; 2021, 31, 3; 731-759
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics, control, stability, diffusion and synchronization of modified chaotic Colpitts oscillator
    Autorzy:
    Rasappan, Suresh
    Niranjan Kumar, K. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1845526.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chaos
    Colpitts oscillator
    Lyapunov exponent
    diffusion
    stability
    synchronization
    Opis:
    The purpose of this paper is to introduce a new chaotic oscillator. Although different chaotic systems have been formulated by earlier researchers, only a few chaotic systems exhibit chaotic behaviour. In this work, a new chaotic system with chaotic attractor is introduced. It is worth noting that this striking phenomenon rarely occurs in respect of chaotic systems. The system proposed in this paper has been realized with numerical simulation. The results emanating from the numerical simulation indicate the feasibility of the proposed chaotic system. More over, chaos control, stability, diffusion and synchronization of such a system have been dealt with.
    Źródło:
    Archives of Control Sciences; 2021, 31, 3; 731-759
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energetic efficiency of mixing in a periodically reoriented Dean flow
    Autorzy:
    Rożeń, Antoni
    Kopytowski, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2086805.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computational fluid dynamics
    laminar flow
    chaotic advection
    curvilinear pipe
    time analysis
    obliczeniowa dynamika płynów
    przepływ laminarny
    rura krzywoliniowa
    analiza czasu
    Opis:
    The energetic efficiency of mixing is studied numerically in a continuous flow mixer constructed from a sequence of alternately twisted pipe bends. Counter-rotating vortices present in the curved channels and known as Dean vortices narrow the distribution of the residence time of fluid elements and accelerate the generation of a new material surface without obstructing the main flow and increasing the risk of fouling or flow stoppage. Cyclic twisting of the pipe curvature allows for quick reorientation of Dean vortices. The reorientation induces chaotic advection in a stable three-dimensional flow and speeds up mixing. The effect of computational domain discretisation for the low and medium Reynolds numbers (20 < Re < 2000º on the head loss, primary and secondary flow, residence time distribution, and the energetic efficiency of generation of the inter material surface is determined. The energetic efficiency is calculated in the time space, a standard approach in modelling reactive micromixing, and at the reactor exit. The maximum energetic efficiency is determined for Re = 600 : 700. It is also found that the initial orientation of the material surface to the pipe curvature has a significant impact on the energetic efficiency of mixing.
    Źródło:
    Chemical and Process Engineering; 2021, 42, 4; 391--410
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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