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    Wyświetlanie 1-13 z 13
    Tytuł:
    The use of PIV methods in the study of two-phase flows in small diameter channels
    Autorzy:
    Sikora, Małgorzata
    Ligus, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2106428.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    two-phase flow
    minichannels
    flow structures
    PIV
    przepływy dwufazowe
    minikanały
    struktury przepływu
    Opis:
    The PIV (Particle Image Velocimetry) method is one of the optical, non-invasive measurement methods for measuring fluid velocity and it can be used in the study of two-phase gas-liquid flows to determine velocity fields. The velocity distribution of the liquid and gas phases influences the formation of two-phase flow structures and, consequently, the mechanisms of energy and moment exchange in the two-phase flow. The article concerns the application of the PIV method in the assessment of hydrodynamic phenomena occurring during two-phase flow realized in pipe minichannels with internal diameters d > 2 mm. Fluorescent marker particles with a density close to that of water were used in the research. The preliminary tests were carried out on the adiabatic water-air mixture. The research aimed to check the applicability of PIV methods also in non-adiabatic flows. As a result of preliminary studies, the velocity maps of the liquid phase, histograms and velocity profiles in the vertical section of the minichannel tested were obtained.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2022, 6, 1; 85--90
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental observations of flow structures during DEP controlled boiling in a microchannel
    Autorzy:
    Lackowski, M.
    Kwidziński, R.
    Karwacki, J.
    Przybyliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240808.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    visualisation
    liquid dielectrophoresis
    flow control
    flow structures
    wizualizacja
    sterowanie
    przepływ
    struktury przepływu
    Opis:
    The paper presents results of experimental investigation of microchannel boiling flow which was controlled by dielectrophoretic (DEP) restrictor. The DEP restrictor was connected to the microchannel liquid supply tube. Operation of DEP restrictor influenced the flow rate at the microchannel inlet. Resulting changes in flow structures and vapour content along the microchannel were observed and analysed with a high-speed video camera. Video recordings were synchronised with measurements of differential pressure between the channel inlet and outlet. It was found that it is possible to change average void fraction in the microchannel by switching on and off the voltage applied to the restrictor electrodes. However, to achieve significant variation of the void fraction, applied voltage should be of the order of 2000 Vpp. The voltage switching also generates oscillations of the differential pressure. The amplitude of these oscillations is proportional to the voltage magnitude, reaching 35 Pa for 2400 Vpp.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 1; 129-145
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of separation and methods of three-dimensional flow structure detection in the boundary layer shock wave interaction
    Autorzy:
    Czerwińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954539.pdf
    Data publikacji:
    1999
    Wydawca:
    Politechnika Gdańska
    Tematy:
    shock wave boundary layer interaction
    flow separation
    3D flow structures
    numerical simulations
    Opis:
    The normal shock wave turbulent boundary layer interaction still draws a great deal of attention as a flow phenomenon. This is due to its profound importance to numerous applications. The understanding of phenomena is crucial for future aims connected with the interaction control. Experimental investigations of the interaction have been carried out since the 1940s. They were aimed however at the determination of such general flow features as: pressure distribution, shock wave configuration or oil visualization of separation structures. In order to better understand the phenomenon, measurements of the entire field are required. At present, such measurements do not exist. A great help is expected from numerical simulations in this respect. There is enough experimental data to check the general features of the flow obtained from calculations. This thesis presents numerical simulations of flow that is assumed: steady, three-dimensional, compressible, viscous and turbulent. Its general aim is to present to what extend the modern numerical methods are able to predict the flow in shock wave turbulent boundary layer interaction including shock induced separation structures. These structures are very sensitive to channel geometry and may be useful in the understanding of separation's development. In order to illustrate the abilities of numerical simulations, one aim of the presented thesis is to investigate the effect of the span-wise depth of the nominally two-dimensional test section. The presented results cast some light on the common problems experienced by typical comparisons of two-dimensional simulations to wind tunnel tests having a three-dimensional nature. The first Chapter presents the basic theory of elementary structures. Considerations of elementary structures of the flow along with their dependencies are necessary for a better understanding of the separation flow structures induced by the boundary layer shock wave interaction. The classification of elementary structures will be presented. In addition, the possible occurrence of bifurcation will also be studied. The second Chapter will be devoted to studying specific cases of transonic turbulent flow. The analysis of numerical results will be bounded to the shock wave structure. Studies shall include: the influence of the numerical scheme, three-dimensional effects connected with the changing width of the channel, a comparison to experiment and the influence of the symmetric boundary condition on the flow prediction in the channel. Finally, the boundary layer influence on the 1-foot structure will also be presented. Chapter three will present the separation structures. Here too a comparison to experiments will be done. Changes in separation structures connected with the width of the channel will be studied. The influence of the symmetry boundary condition will be shown. Finally, the specification of the basic flow structures will be done.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 1; 53-140
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of flow structures during HFE-7100 refrigerant condensation
    Autorzy:
    Bohdal, T.
    Sikora, M.
    Widomska, K.
    Radchenko, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240718.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation
    minichannels
    flow structures
    refrigerant
    kondensacja
    minikanał
    struktura przepływu
    czynnik chłodniczy
    Opis:
    The experimental research of environmentally friendly refrigerant HFE-7100 condensation in pipe minichannels was conducted. During the investigations of HFE-7100 condensation in a minichannel with internal diameter 2 mm together with visualization of flow patterns was made. Visualization results were compared with existing flow structure maps. The identification of the range of flow patterns occurrence during the condensation process of low-pressure refrigerant HFE-7100 was made. The tests were performed throughout the whole range of condensation process.
    Źródło:
    Archives of Thermodynamics; 2015, 36, 4; 25-34
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of computer image analyzes in the investigation of refrigerants condensation in minichannels
    Autorzy:
    Sikora, Małgorzata
    Bohdal, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/240468.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation
    flow structures
    image analyze
    minichannels
    kondensacja
    struktury przepływu
    analiza obrazu
    minikanały
    Opis:
    The image analysis consists in extracting from the information which is available to the observer of the part that is important from the perspective of the investigated process. This process usually accompanies a considerable reduction in the amount of information from the image. In the field of two-phase flows, computer image analysis can be used to determine flow and geometric parameters of flow patterns. This article presents the possibilities of using this method to determine the void fraction, vapor quality, bubble velocity and the geometric dimensions of flow patterns. The use of computer image analysis methods is illustrated by the example of HFE 7100 refrigerant methoxynonafluorobutane condensation in a glass tubular minichannel. The high speed video camera was used for the study, and the films and individual frames received during the study were analyzed.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 1; 103-114
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Numerical Study of Non-hydrostatic Shallow Flows in Open Channels
    Autorzy:
    Zerihun, Y. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240980.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    turbulent flow
    numerical modelling
    non-hydrostatic pressure
    rapidly-varied flow
    hydraulic structures
    Opis:
    The flow field of many practical open channel flow problems, e.g. flow over natural bed forms or hydraulic structures, is characterised by curved streamlines that result in a non-hydrostatic pressure distribution. The essential vertical details of such a flow field need to be accounted for, so as to be able to treat the complex transition between hydrostatic and non-hydrostatic flow regimes. Apparently, the shallow-water equations, which assume a mild longitudinal slope and negligible vertical acceleration, are inappropriate to analyse these types of problems. Besides, most of the current Boussinesq-type models do not consider the effects of turbulence. A novel approach, stemming from the vertical integration of the Reynolds-averaged Navier-Stokes equations, is applied herein to develop a non-hydrostatic model which includes terms accounting for the effective stresses arising from the turbulent characteristics of the flow. The feasibility of the proposed model is examined by simulating flow situations that involve non-hydrostatic pressure and/or nonuniform velocity distributions. The computational results for free-surface and bed pressure profiles exhibit good correlations with experimental data, demonstrating that the present model is capable of simulating the salient features of free-surface flows over sharply-curved overflow structures and rigid-bed dunes.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2017, 64, 1; 17-35
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active flow control by countercurrent jets
    Sterowanie przepływem przy zastosowaniu strugi przeciwbieżnej
    Autorzy:
    Asendrych, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/279179.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    countercurrent jets
    jet stability
    flow control
    coherent structures
    Opis:
    The paper presents the results of experimental analysis of the flowfield in slightly heated countercurrent round jets. The velocity measurements were carried out by means of hot-wire anemometry (a combined CTACCA system for temperature compensation). The instantaneous signals collected during the experiment were digitally processed and used for determination of the statistics of velocity and temperature fields including frequency characteristics. The results revealed that the fluid aspiration at the jet periphery significantly influences large-scale structures naturally existing in the flow and being responsible to a great extent for the mixing and entrainment in the free flow. The aspiration intensity was found as the key parameter deciding about the way the reverse flow either inhibits or enhance transport processes.
    W pracy zaprezentowano wyniki badań eksperymentalnych pola przepływu w lekko nieizotermicznych strugach przeciwbieżnych. Pomiary prędkości zostały przeprowadzone z użyciem 2-kanałowego układu termoanemometrycznego (układ stałotemperaturowy CTA z kompensacją temperatury kanałem stałoprądowym CCA). Sygnały pomiarowe zarejestrowane w trakcie eksperymentu były następnie poddane obróbce cyfrowej w celu uzyskania statystyk pól prędkości i temperatury, obejmujących również rozkłady widmowe turbulentnych fluktuacji. Uzyskane wyniki wykazały, iż zastosowanie przepływu zwrotnego na obrzeżach strugi głównej modyfikuje znacząco charakterystyki zorganizowanych struktur wirowych, występujących w przepływie w sposób naturalny i odpowiedzialnych w dużym stopniu za podsysanie czynnika z otoczenia oraz jego wymieszanie ze strugą główną. Obraz pola przepływu okazał się być silnie zależny od intensywności odsysania, która w zależności od poziomu może prowadzić do wytłumienia lub intensyfikacji procesów transportu promieniowego.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2007, 45, 3; 463-477
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of near-wall turbulence with large-eddy velocity modes
    Modelowanie turbulencji za pomocą wielkoskalowych modów prędkości
    Autorzy:
    Wacławczyk, M.
    Pozorski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/279207.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    proper orthogonal decomposition
    coherent structures
    turbulent channel flow
    Opis:
    In the paper, low-order modelling of the turbulent velocity field in the near-wall region is performed using the Proper Orthogonal Decomposition (POD) approach. First, an empirical eigenfunction basis is computed, basing on two-point velocity correlations. Next, the Galerkin projection of the Navier-Stokes equations on the truncated basis is performed. This results in a system of Ordinary Differential Equations (ODEs) for time-dependent coefficients. Evolution of the largest vortical structures in the near-wall zone is then obtained from the time dependent coefficients and eigenfunctions. The system applied in the present work consists of 20 ODEs, the reconstructed velocity field is two-dimensional in the pIane perpendicular to the main flow direction. Moreover, the filtering procedure associated with the POD method is discussed, the POD filter is derived and compared with LES filters.
    Przedmiotem pracy jest modelowanie turbulentnego pola prędkości w obszarze przyściennym za pomocą niskowymiarowego systemu dynamicznego, opartego o dekompozycję w bazie funkcji własnych POD (ang. Proper Orthogonal Decomposition). Empiryczna baza funkcyjna POD została wyznaczona z rozwiązania zagadnienia własnego, w którym obecne są dwupunktowe korelacje prędkości. Następnie, w wyniku projekcji Galerkina równań pędu na podprzestrzeń rozpiętą na tej bazie funkcyjnej, otrzymano układ równań różniczkowych zwyczajnych na zależne od czasu wspołczynniki. Na podstawie funkcji własnych oraz z wyznaczonych współczynników rozkładu uzyskano ewolucję w czasie charakterystycznych struktur wirowych w obszarze przyściennym. System dynamiczny rozpatrywany w pracy składa się z 20 równań różniczkowych zwyczajnych. Zrekonstruowane pole prędkości jest dwuwymiarowe (w płaszczyźnie prostopadłej do głównego kierunku przepływu). Ponadto w pracy dyskutowana jest procedura filtrowania związana z metodą POD. Wyprowadzony filtr POD porównano z formułą używaną w metodzie symulacji dużych wirów.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2007, 45, 3; 705-724
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sole structures as a tool for depositional environment interpretation : a case study from the Oligocene Cergowa Sandstone, Dukla Unit (Outer Carpathians, Slovakia)
    Autorzy:
    Dirnerová, D.
    Janočko, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059973.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    sedimentology
    sole structures
    flow properties
    Dukla Unit
    Cergowa sandstone
    Western Carpathians
    Opis:
    Sole structures, typically developed on basal bedding surfaces of turbidite sandstones, are commonly used as palaeocurrent indicators and indicators of the current ability to erode. Detailed analysis of types and frequency of sole structures in the 128 m thick succession of Early Oligocene Cergowa Sandstone (Outer Western Carpathians) also shows their potential as an indicator of flow condition during the deposition. The massive and amalgamated sandstones, predominantly containing load casts and minor flutes and grooves with unidirectional orientation, are suggested to be deposited by highly turbulent flow after reaching hydraulic jump behind the topographic obstacle. High range of sole structures in thick and medium thick sandstones, suggesting inferior oblique and reverse flows, implies deposition from density stratified flows where lower, denser part has a tendency to deflect when hit the basin floor obstacle. The upper, less dense part has an ability to come over the obstacle and shows only small scatter in the palaeocurrent direction.
    Źródło:
    Geological Quarterly; 2014, 58, 1; 41--50
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intrastratal flow in the Cretaceous Gyeokpori Formation (SW South Korea)
    Autorzy:
    Byun, Uk Hwan
    Van Loon, A.J. (Tom)
    Kwon, Yi Kyun
    Ko, Kyoungtae
    Powiązania:
    https://bibliotekanauki.pl/articles/2060260.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    intrastratal flow
    Gyeokpori Formation
    soft-sediment deformation structures
    lacustrine environment
    Cretaceous
    Opis:
    Intrastratal flow is a process that is still poorly understood, rarely described and difficult to interpret in ancient rocks. Sediments in the Cretaceous lacustrine Gyeokpori Formation of southwestern South Korea contain some chaotically deformed sandstone layers with deformed mudstone clasts that are ascribed to this process. The interpretation is based on the fact that these layers cannot be explained as a result of subaqueous debris flows or mass transport, whereas the sedimentary context, including the presence of other soft-sediment deformation structures, indicates that intrastratal flow must have been physically possible. The sedimentary setting was a lake in which mainly siliciclastic rocks were deposited, with some interbedded volcaniclastics. The nearby volcanic activity caused seismic shocks that affected the unstable lake margins resulting in the dominance of gravity-flow deposits, but also in a high sedimentation rate that facilitated soft-sediment deformation partly caused by intrastratal flow. This must have happened fairly frequently during a probably limited time-span, as several layers showing traces of intrastratal flow are present within a succession of only <1 m thick. The combined data on the geological setting and our findings regarding the origin of the various soft-sediment deformation structures may help to recognize the traces left by intrastratal flow elsewhere in the geological record.
    Źródło:
    Geological Quarterly; 2020, 64, 3; 611--625
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation of ship airwakes by scale adaptive simulation
    Autorzy:
    Shukla, S.
    Singh, S. N.
    Sinha, S. S.
    Vijayakumar, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116802.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    applications for navy
    ship airwakes
    Scale Adaptive Simulation (SAS)
    simulation
    flow phenomena
    turbulent structures
    investigation by simulation
    ship airwakes flow characteristic
    Opis:
    An early assessment of the ship airwakes flow characteristic is one of the most challenging tasks associated with the designing of vessels. The presence of ship airwake creates very complex flow phenomena due to the presence of strong velocity gradients in space and time and widely varying high levels of recirculation and turbulence. Under such condition, the landing and take-off operation of a helicopter over the ship helodeck is very complex and accurate prediction represents a computational challenge. We present time-accurate scale-adaptive simulation (SAS) of turbulent flow around a simple frigate ship to gain insight into the flow phenomena over the helodeck. Numerical analysis is carried out after several grids and time-steps refinement to ensure the spatial and temporal accuracy of the numerical data. The instantaneous iso-surface of eddy flow structures and vorticity have been analysed across the vertical and longitudinal plane. Results show good agreement with experimental data. Comparisons of mean quantities and velocity spectra show good agreement, indicating that SAS can resolve the large-scale turbulent structures which can adversely impact ship-helo combined operations. Overall, the SAS approach is shown to capture the unsteady flow features of massively separated ship airwake characteristics with reasonable accuracy.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 471-475
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coherent structures and flow control: genesis and prospect
    Autorzy:
    Gad-El-Hak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201471.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    smart wings
    coherent structures
    reactive flow control
    adaptive control
    machine-learning control
    futuristic control systems
    microsensors
    microactuators
    artificial intelligence
    turbulent shear flows
    history of flow control
    history of coherent structures
    inteligentne skrzydła
    kontrola adaptacyjna
    mikroczujniki
    sztuczna inteligencja
    Opis:
    The genesis of both coherent structures and reactive flow control strategies is explored. Futuristic control systems that utilize microsensors and microactuators together with artificial intelligence to target specific coherent structures in a transitional or turbulent flow are considered. Of possible interest to the readers of this journal is the concept of smart wings, to be briefly discussed early in the article.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 3; 411-444
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft-sediment deformation structures in cores from lacustrine slurry deposits of the Late Triassic Yanchang Fm. (central China)
    Autorzy:
    Yang, R.
    van Loon, A. J.
    Yin, W.
    Fan, A.
    Han, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/94445.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    soft-sediment deformation structures
    low-density gravity-flow deposits
    Triassic
    lacustrine sediments
    Ordos basin
    China
    struktury deformacji
    osady miękkie
    złoża grawitacyjne o niskiej gęstości
    trias
    osady jeziorne
    zlewnia
    Ordos
    Chiny
    Opis:
    The fine-grained autochthonous sedimentation in the deep part of a Late Triassic lake was frequently interrupted by gravity-induced mass flows. Some of these mass flows were so rich in water that they must have represented slurries. This can be deduced from the soft-sediment deformation structures that abound in cores from these lacustrine deposits which constitute the Yanchang Fm., which is present in the Ordos Basin (central China). The flows and the resulting SSDS were probably triggered by earthquakes, volcanic eruptions, shear stress of gravity flows, and/or the sudden release of overburden-induced excess pore-fluid pressure. The tectonically active setting, the depositional slope and the high sedimentation rate facilitated the development of soft-sediment deformations, which consist mainly of load casts and associated structures such as pseudonodules and flame structures. Sediments with such deformations were occasionally eroded by slurries and became embedded in their deposits.
    Źródło:
    Geologos; 2016, 22, 3; 201-211
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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