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Wyszukujesz frazę "flow structures" wg kryterium: Temat


Wyświetlanie 1-4 z 4
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:
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
    Wyświetlanie 1-4 z 4

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