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Wyświetlanie 1-5 z 5
Tytuł:
Modelowanie przepływów wielofazowych w mikrokanałach
Modelling of multi-phase flow in microchannels
Autorzy:
Dziubiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/2070821.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mikrokanał
przepływy wielofazowe
mapy przepływu
udział faz
microchannel
multiphase flow
flow pattern map
hold-up
Opis:
W pracy przedstawiono aktualny stan badań dotyczących modelowania przepływów wielofazowych ciecz - gaz i ciecz - ciecz w mikrokanałach.
The state of the art concerning multi-phase flow of gas - liquid and liquid — liquid systems in microchannels is presented in the paper.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 6; 55-56
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
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:
Investigations on mixture preparation for two phase adiabatic pressure drop of R134a flowing in 5 mm diameter channel
Autorzy:
Muszyński, T.
Andrzejczyk, R.
Dorao, C. A.
Powiązania:
https://bibliotekanauki.pl/articles/240440.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adiabatic flow
frictional pressure drop
two-phase flow
flow pattern map
R134a
przepływ adiabatyczny
tarciowy spadek ciśnienia
przepływ dwufazowy
mapy przepływu
Opis:
The article presents detailed two-phase adiabatic pressure drops data for refrigerant R134a. Study cases have been set for a mass flux varying from 200 to 400 kg/m2s, at the saturation temperature of 19.4°C. Obtained experimental data was compared with the available correlations from the literature for the frictional pressure drop during adiabatic flow. Influence of mixture preparation on pressure drop was investigated, for varying inlet subcooling temperature in the heated section. The flow patterns have also been obtained by means of a high-speed camera placed in the visualization section and compared with literature observations.
Źródło:
Archives of Thermodynamics; 2017, 38, 3; 101-118
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some problems of hydrodynamics of two-phase flow mixtures in minichannels
Autorzy:
Wengel, M.
Miłaszewicz, B.
Ulbrich, R.
Powiązania:
https://bibliotekanauki.pl/articles/240674.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-phase flow
minichannel
flow pattern
flow regime map
przepływ dwufazowy
minikanał
model przepływu
mapa przepływu
Opis:
Gas-liquid two-phase flow in minichannels has been the subject of increased research interest in the past few years. Evaluation, however, of today's state of the art regarding hydrodynamics of flow in minichannels shows significant differences between existing test results. In the literature there is no clear information regarding: defining the boundary between minichannels and conventional channels, labelling of flow patterns. The review of literature on the hydrodynamics of gas-liquid flow in minichannels shows that, despite the fact that many research works have been published, the problem of determining the effect of diameter of the minichannel on the hydrodynamics of the flow is still at an early stage. Therefore, the paper presents the results of research concerning determination of flow regime map for the vertical upward flow in minichannels. The research is based on a comprehensive analysis of the literature data and on the research that has been carried out. Such approach to the mentioned above problems concerning key issues of the two-phase flow in minichannels allowed to determine ranges of occurrence of flow structures with a relatively high accuracy.
Źródło:
Archives of Thermodynamics; 2014, 35, 2; 93-101
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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