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    Wyświetlanie 1-6 z 6
    Tytuł:
    Multiphase flow mixture in 180[degrees] pipe bends
    Autorzy:
    Pietrzak, M.
    Witczak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/185343.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydrodynamics
    gas-liquid flow
    pipe bends
    hydrodynamika
    przepływ gazu i cieczy
    kolanko
    Opis:
    This paper presents the results of research regarding measurements of the values of pressure drops during horizontal flow of gas-liquid and gas-liquid-liquid mixture through 180o pipe bends. The conducted insightful analysis and assessment during multi-phase flow in pipe bends has enabled to develop a new method for determination of their values. This new method for determining pressure drops ensures higher precision of calculation in comparison to other methods presented in literature and can be applied for calculation of these parameters during multi-phase flows in pipe bends with various geometries.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 2; 227-239
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure drop in two-phase gas-liquid (Taylor) flow in microreactors
    Autorzy:
    Cygański, P.
    Sobieszuk, P.
    Pohorecki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/185780.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przepływ Taylora
    przepływ gaz-ciecz
    spadek ciśnienia
    mikroreaktor
    gas-liquid Taylor flow
    microreactor
    pressure drop
    Opis:
    The pressure drop in microreactors for the gas - liquid Taylor flow was measured for 4 different microreactor geometries and 3 different gas - liquid systems. The results have been compared with the existing literature correlations. A selection of the best correlations has been made.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 3; 369-384
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of interfacial parameters of horizontal two-phase plug flow using a high speed pulse-echo ultrasonic technique
    Autorzy:
    Masala, T.
    Harvel, G.
    Su, J.
    Chang, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175381.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas-liquid two-phase flow
    horizontal flow
    intermittent flow regimes
    ultrasonic techniques
    pulse-echo
    interfacial parameters
    Opis:
    This paper presents a high-speed, multiple-transducers, pulse-echo ultrasonic technique for the measurement of interfacial parameters of horizontal two-phase intermittent flow regimes. The ultrasonic system consisted of an ultrasonic driver, a multiplexer with 4 transducers, and a microcomputer equipped with a data acquisition card, a motion controller card and the Winspect Data Acquisition software. Two transducers were mounted on the top of a 2.1 cm inner diameter circular pipe, while the other two transducers were mounted on the bottom of the pipe. Using instantaneous liquid level measurements from multiple transducers, two-phase flow interfacial parameters in plug were determined, such as the lengths and the velocities of liquid plugs and bubbles, the shape of the gas-liquid interface, and hence instantaneous and cross sectional averaged void fraction and interfacial area. The results showed that the liquid plug velocities as well as the elongated bubble velocity increases with increasing superficial liquid and gas velocities. An experimental correlation for liquid plug velocity was proposed based on the present results. The results also showed that the time and cross-sectional averaged void fraction in the plug flow regime was only slightly influenced by the superficial gas velocity but was not influenced by the superficial liquid velocity.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2010, 122; 61-76
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy of intrinsic mode function for gas-liquid flow pattern identification
    Autorzy:
    Sun, Z.
    Gong, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/221137.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas-liquid flow pattern
    flow-pattern map
    pressure fluctuation
    bluff body
    signal energy
    intrinsic mode function
    empirical mode decomposition
    Opis:
    Gas-liquid flows abound in a great variety of industrial processes. Correct recognition of the regimes of a gas-liquid flow is one of the most formidable challenges in multiphase flow measurement. Here we put forward a novel approach to the classification of gas-liquid flow patterns. In this method a flow-pattern map is constructed based on the average energy of intrinsic mode function and the volumetric void fraction of gas-liquid mixture. The intrinsic mode function is extracted from the pressure fluctuation across a bluff body using the empirical mode decomposition technique. Experiments adopting air and water as the working fluids are conducted in the bubble, plug, slug, and annular flow patterns at ambient temperature and atmospheric pressure. Verification tests indicate that the identification rate of the flow-pattern map developed exceeds 90%. This approach is appropriate for the gas-liquid flow pattern identification in practical applications.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 4; 759-766
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New gas-liquid two-phase flow pattern maps based on the energy ratio of pressure fluctuation through a Venturi tube
    Autorzy:
    Sun, Zhiqiang
    Chen, Luyang
    Yao, Fengyan
    Powiązania:
    https://bibliotekanauki.pl/articles/220955.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas-liquid two-phase flow
    flow pattern map
    Venturi tube
    pressure fluctuation
    energy ratio
    ensemble empirical mode decomposition
    Opis:
    To find effective and practical methods to distinguish gas-liquid two-phase flow patterns, new flow pattern maps are established using the differential pressure through a classical Venturi tube. The differential pressure signal was first decomposed adaptively into a series of intrinsic mode functions (IMFs) by the ensemble empirical mode decomposition. Hilbert marginal spectra of the IMFs showed that the flow patterns are related to the amplitude of the pressure fluctuation. The cross-correlation method was employed to sift the characteristic IMF, and then the energy ratio of the characteristic IMF to the raw signal was proposed to construct flow pattern maps with the volumetric void fraction and with the two-phase Reynolds number, respectively. The identification rates of these two maps are verified to be 91.18% and 92.65%. This approach provides a cost-effective solution to the difficult problem of identifying gas-liquid flow patterns in the industrial field.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 241-252
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Absorption of CO2 into perfluorinated gas carrier in the Taylor gas–liquid flow in a microchannel system
    Autorzy:
    Sobieszuk, P.
    Pilarek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185397.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    perfluorodecalin (PFD)
    liquid gas carrier
    solubility
    Taylor flow
    microreactor
    perfluorodekalina (PFD)
    gaz ciekły
    rozpuszczalność
    przepływ Taylora
    mikroreaktor
    Opis:
    The aim of this study was to determine the solubility of CO2 in perfluorodecalin (PFD) which is frequently used as efficient liquid carrier of respiratory gases in bioprocess engineering. The application of perfluorinated liquid in a microsystem has been presented. Gas-liquid mass transfer during Taylor (slug) flow in a microchannel of circular cross section 0.4 mm in diameter has been investigated. A physicochemical system of the absorption of CO2 from the CO2/N2 mixture in perfluorodecalin has been applied. The Henry’s law constants have been found according to two theoretical approaches: physical (H = 1.22x10-3 mol/m3Pa) or chemical (H = 1.26x10-3 mol/m3Pa) absorption. We are hypothesising that the gas-liquid microchannel system is applicable to determine the solubility of respiratory gases in perfluorinated liquids.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 4; 595-602
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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