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    Wyświetlanie 1-5 z 5
    Tytuł:
    Experimental investigations of cavitating flows in a Venturi tube
    Autorzy:
    Niedźwiedzka, A.
    Sobieski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/297948.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    cavitation
    test rig
    Venturi tube
    Opis:
    This article presents results of the experimental measurements of the cavitation phenomena in a Venturi tube with water as the working medium. Three variants of such tube were tested. Angles of converging and diverging sections are equal to 45o and 45o, 30o and 60o, 45o and 60o, respectively. In every case the throat diameter is equal to 3 mm and the throat length to 6 mm. The average flow velocity ranges from 0.1 to 0.5 m/s. During measurements, the average flow velocity, upstream and downstream pressure and water temperature were recorded. Additionally, by the use of a high-speed camera and a simple digital camera, information about the size and the shape of the bubble clouds for different flow conditions was collected. The aim of the article is data acquisition for the further numerical analyses. The experimental runs executed for this paper are to help provide more information about this type of flow, since numerical modeling of the cavitation phenomena in Venturi tubes is still very difficult and in many cases even quantitative agreement is impossible to obtain.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(2); 151-164
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical analysis of cavitating flow in Venturi tube on the basis of experimental data
    Autorzy:
    Niedźwiedzka, A.
    Sobieski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/298422.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    cavitation
    Venturi tube
    mass flow rate
    Opis:
    The content of this article is a direct continuation of the prior experimental works on the topic of cloud cavitation in Venturis. The results of the experimental tests were used to create a set of characteristics for three types of Venturis. The article has two aims: 1) verification of the similarity between the characteristics obtained and reported in the literature, 2) verification of the range of the obtained characteristics with respect to parallel diagrams. Both aims were achieved, which confirms that the quality of the prior results of the experimental measurements is at least sufficient to realize the main objective of the whole project: creation of numerical models of cavitating flow in Venturis. The literature overview showed that the issue has been not solved until today, even at the qualitative level. This reason was the motivation for the undertaken research, including contents of the article.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(3); 215-229
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Validation of Numerical Simulations of Cavitating Flow in Convergent-Divergent Nozzle
    Autorzy:
    Niedźwiedzka, A.
    Lipiński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/114485.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    cavitating flow
    numerical simulations
    homogenous models
    optoelectronic validation
    Opis:
    In the article, validation of results of numerical simulations of cavitating flow in a convergent-divergent nozzle is presented. In validation, a new optoelectronic system is used in order to extract the changes in the bubbles volume fraction of the mixture in freely specified cross-sections. Three homogeneous models (Schnerr and Sauer, Singhal et al. and Zwart et al.) are analysed. The assessment of usefulness of the new system in experimental measurements of cavitation is the main aim of the article. Looking for new opportunities to replace image analysis, which is a traditional validation method in numerical simulations of cavitating flows, is motivation for the research. The results obtained with the use of the system show a good agreement with the simulation’s results for the two chosen cross-sections. The described optoelectronic system gives promising results and can be regarded as an alternative to traditional validation methods in the cavitation research area.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 10; 329-332
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optoelectronic System Registering the Shape of Cavitation Cloud
    Autorzy:
    Lipiński, S.
    Niedźwiedzka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114527.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    cavitation cloud
    shape registration
    optoelectronic system
    Opis:
    Cavitation is one of the most interesting phenomena in area of fluid flow research. It can be observed in many different hydraulic systems and its effects can be very serious. Basic problem with cavitation is its observation. The main aim of the paper is to propose and evaluate the simple method allowing registration of the cavitation cloud shape, which will be financially and computationally undemanding. Therefore, the article presents the system registering the shape of cavitation cloud. It is based on the optoelectronic devices, i.e. lasers and photoresistors, as well as on the assumption that cavitation leads to diffusion of lasers light on the vapor bubbles. The experiment was performed for three cavitation inducers and two flow velocities. Obtained results shows that the shape of cavitation cloud is dependent on the inducer, but not on flow velocity. It can be concluded that the described optoelectronic system can be regarded as an inexpensive alternative to traditional methods of cavitation observation.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 7; 238-240
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of numerical models of cavitating flows with the use of the homogeneous approach
    Autorzy:
    Niedźwiedzka, A.
    Schnerr, G. H.
    Sobieski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/239953.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sheet cavitation
    cloud cavitation
    homogeneous models
    steady-state
    unsteady
    hydrofoil
    venturi
    cylinder
    model jednorodny
    stan stabilny
    stan ustalony
    niestacjonarny
    hydropłat
    Opis:
    The focus of research works on cavitation has changed since the 1960s; the behaviour of a single bubble is no more the area of interest for most scientists. Its place was taken by the cavitating flow considered as a whole. Many numerical models of cavitating flows came into being within the space of the last fifty years. They can be divided into two groups: multifluid and homogeneous (i.e., single-fluid) models. The group of homogenous models contains two subgroups: models based on transport equation and pressure based models. Several works tried to order particular approaches and presented short reviews of selected studies. However, these classifications are too rough to be treated as sufficiently accurate. The aim of this paper is to present the development paths of numerical investigations of cavitating flows with the use of homogeneous approach in order of publication year and with relatively detailed description. Each of the presented model is accompanied by examples of the application area. This review focuses not only on the list of the most significant existing models to predict sheet and cloud cavitation, but also on presenting their advantages and disadvantages. Moreover, it shows the reasons which inspired present authors to look for new ways of more accurate numerical predictions and dimensions of cavitation. The article includes also the division of source terms of presented models based on the transport equation with the use of standardized symbols.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 2; 71-88
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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