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Wyświetlanie 1-15 z 23
Tytuł:
Predicting relative permeability from experimental capillary pressure porous plate test for two phase flow
Autorzy:
Czarnota, R.
Janiga, D.
Stopa, J.
Wojnarowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/298727.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
capillary pressure
relative permeability
crude oil
multiphase flow
Opis:
Relative permeabilities relationships as a function of fluids saturation are one of the most important parameters for describing multiphase flow processes in reservoir rocks. When direct laboratory tests are not available for investigating oil-water multi-phase flow in rocks, then indirect prediction techniques using relative permeability functions are widely used, e.g. from capillary pressure test. In this study the measurement of capillary pressure was performed on rocks plugs with different characteristics at reservoir conditions using porous plate method. During measurement semi-permeable membrane was used with 15 bar threshold pressure, what allowed to register formation water saturation, at changing differential pressures steps. Desaturation at each pressure stage was continued until no more produced liquid was observed. Water saturation point at maximum capillary pressure applied is assumed to be final irreducible water saturation. Application of porous plate method provides sufficient stabilization time, allowing to achieve uniform saturation distribution. In this research, Brook-Corey model was used to predict relative permeability from experimental measured capillary pressure data for oil-water phase flow in porous media. As a result, it is possible to obtain more accurate capillary pressure outcomes, and relative permeability curves for the two-phase system, than other methods used in practice. Performing capillary pressure measurements at reservoir conditions, allows to restore the processes occurring in the reservoir.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 2; 323-334
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cavitation phenomenon research for different flow conditions
Autorzy:
Homa, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/1178400.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cavitation
experimental fluid mechanics
flow over a foil
multiphase flow
Opis:
Cavitation is a multiphase phenomenon including vapor bubbles creation and collapse occurring alternately at high frequency in liquid stream. Creation of bubbles is possible under low pressure conditions, which occur for example during acceleration of the liquid. The collapses of bubbles generate pressure waves which spread through the flow. Working under cavitation condition is especially dangerous for power machines such as pumps and turbines, because it can lead to serious damage of blades. To investigate cavitating flow over a foil a test rig was built. The test rig included chamber with the blade fixed to the disc that enabled to set different angles of attack. The flow rate of water was changed by means of pump’s motor variable frequency drive. As the flow rate was increased, the velocity in chamber rose and pressure dropped. This led to cavitation structures appearance and development on the suction side of the blade. For different flow conditions the pictures of cavitating flow were taken and examined. Moreover, the pressure and the inlet and outlet of the chamber were recorded, as well as the value of volumetric flow rate. That enabled to determine the cavitation number, a parameter that describes intensity of cavitation in the flow, for each case.
Źródło:
World Scientific News; 2017, 73; 1-11
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation into influence of oil-in-water emulsions flow on permeability of porous bed
Autorzy:
Błaszczyk, Mariola
Sęk, Jerzy
Przybysz, Łukasz
Pacholski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1178549.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
emulsions
multiphase flow
oil-in-water
porous bed permeability
Opis:
Emulsions are interesting dispersed systems that are necessary for a number of technological processes. Their flow through porous structures have many applications in the field of chemical engineering. Enhanced Oil Recovery (EOR) techniques, soil remediation and various treatment methods of oily wastewater are good examples of emulsion flow in porous structure. The phenomenon of dispersed system flow through porous media is not easy to describe, mainly because of rheological behavior of emulsions and porous structure properties. During two phase flow of oil and water through porous bed it is possible to observe the interception of oil to porous structure, as well as filtration of oil in pores. In this study, we tried to examine the influence of the fraction size as well as migration process history on permeability of porous bed.
Źródło:
World Scientific News; 2017, 70, 2; 241-251
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of emulsion inner phase concentration on permeability of deposit during flow through porous media
Autorzy:
Przybysz, Ł.
Błaszczyk, M.
Sęk, J.
Powiązania:
https://bibliotekanauki.pl/articles/105662.pdf
Data publikacji:
2017
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
emulsion
porous media
multiphase flow
emulsja
media porowate
przepływy wielofazowe
Opis:
The issue of emulsion flow through porous media plays an important role in the development of land purification methods from various oily substances, as well as during the oil extraction process. The concentration of the emulsion dispersed phase exerts a strong influence on the rheological properties. The oil in water emulsions (O/W), that have a concentration of less than 0.5 (or 50%), show Newtonian behavior, and those with higher concentrations non-Newtonian. The flow of such systems through the structure of the porous medium is, therefore, also dependent on the variable rheological properties of the liquid. When the emulsion flows through the porous medium, a reduction of the relative permeability occurs. Due to that the transport may be very effectively limited, as the pores of deposit are being blocked by oil droplets. The paper presents studies on emulsion flow, with various concentrations, through a granular bed. It allowed to track changes in the permeability of the deposit over time. The results of experimental studies of transport and elution of highly concentrated emulsions from granular structures are also presented. This enabled tracking of changes in flow resistance of the emulsion through the porous bed in time. Moreover, the development of the mathematical model, which allows us to define the relationship between the bed blockage degree and the concentration of the emulsion internal phase could be the result of the experimental works. The results of such studies are very widely used in practice, among other things, in the issues of migration of pollutants, such as petroleum substances, in the soil layers. The development of knowledge in this field may contribute to the optimization of existing oil recovery techniques and methods of remediation of soil from organic substances.
Źródło:
Acta Innovations; 2017, 23; 25-34
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of bubble-particle interaction in different flotation processes and applications - a review of recent studies
Autorzy:
Patnaik, Nelesh
Menon, Aditya
Gupta, Tapesh
Joshi, Vijesh
Powiązania:
https://bibliotekanauki.pl/articles/1450499.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
bubble-particle interaction
bubble dynamics
multiphase flow
fluid interface
Opis:
Flotation process involves aggregation of the particles based on the material/compound type of random mixtures such as ores and seawater. It is primarily used in pretreatment of water desalination and other industrial applications. The process makes use of various fluid mechanics principles as multifluids are involved. The multi-fluids in most of the flotation processes are of different phases, such as air and water. Like any other process, the efficiency of flotation is important, and hence most of the studies have been dedicated to understanding how the various parameters are affecting the flotation process. Among various parameters, fluids properties and flow parameters chiefly affect the flotation process. In particular, the bubble-particle interaction of the flotation process has been of interest as it is one of the cost-effective ways to enhance flotation efficiency. In this review, the authors present the latest developments in such parametric studies. This paper could be of interest to research students, academic researchers, and practitioners who want to contribute to (or take from) flotation research.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 6; 206-224
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational fluid dynamics simulation of gas–liquid multiphase flow in T-junction for CO2 separation
Autorzy:
Wrzesień, Sylwia
Madejski, Paweł
Ziółkowski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/37215646.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Computational Fluid Dynamics
CFD
Multiphase Flow
Numerical Simulations
T-junction
Opis:
The article presents the results of a computational fluid dynamics (CFD) analysis of gas-liquid multiphase flow. The simulation was conducted using CFD code and the Euler–Euler approach. The presented study relates to the non–reactive, steady-state, turbulent flow of water and carbon dioxide mixture in a 3D pipe. Separation phenomenon between phases is observed. The solution was obtained using a mixture model. Different values of carbon dioxide volume fraction were taken into account in the analysis of the results. The analysed cases were compared thanks to the obtained calculations results. The main purpose of the simulations was to show streamlines, velocity, pressure, and volume fraction distribution that could be useful in developing pipeline systems in many industrial applications, especially for CO2 separators.
Źródło:
Zeszyty Energetyczne; 2020, 7; 403-414
2658-0799
Pojawia się w:
Zeszyty Energetyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrodynamics of Pilot Plant Scale Airlift Reactor in Presence of Alcohols
Autorzy:
Nandi, S.
Jaju, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/779781.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
air-lift reactor
hydrodynamics
gas hold-up
bubble
multiphase flow
surfactant
Opis:
The overall gas hold-up of a pilot plant scale internal loop airlift reactor was studied in presence of different alcohols in varied concentration. It has been observed that these simple alcohols can enhance overall gas hold-up of the airlift assembly possibly due to formation of protective thin layer over smaller gas bubbles thereby reducing chance of their coalescence. As the alcohols can be used as food source for the micro organisms present in the system, this green and environment friendly process have potential to replace usage of hazardous surfactants often used for enhancing overall hold-up in order to obtain desired mass transfer characteristics. An empirical relationship encompassing overall gas hold-up of the reactor as a function of superficial gas velocity and alcohol concentration is also developed.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 118-123
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capillary Pumped Loop as a tool for collecting large heat fluxes from electronic devices on warships
Autorzy:
Mikielewicz, D.
Szymański, P.
Powiązania:
https://bibliotekanauki.pl/articles/260217.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Loop Heat Pipe
Capillary Pumped Loop
Porous Media
Multiphase Flow
Heat Transfer
Opis:
The combat potential of future warships will be directly related to the use of modern electronic devices being parts of advanced systems, such as, for instance, radar systems, fire aiming systems, fire detection systems, electric drive systems, and even electronic and radio-electronic weaponry, railguns and lasers, installed on these warships. The capacity and functionality of these devices is continually increasing, at decreasing mass and dimensions, which results in higher power consumption. Heat collection becomes a growing problem in operation of these devices. The paper presents a concept of the use of the CPL (Capillary Pumped Loop) cycle for passive heat collection from precise electronic devices used on warships. It also includes the description of the experimental rig and discussion of the results of laboratory tests performed on this rig and confirmed using the mathematical model developed by the authors.
Źródło:
Polish Maritime Research; 2017, 1; 72-80
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eulerian three - phase flow model applied to trickle - bed reactors
Autorzy:
Burghardt, A.
Powiązania:
https://bibliotekanauki.pl/articles/185072.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiphase flow
averaging
procedure
trickle-bed reactor conservation equation
przepływ wielofazowy
procedura
Opis:
The majority of publications and monographs present investigations which concern exclusively two-phase flows and particulary dispersed flows. However, in the chemical and petrochemical industries as well as in refineries or bioengineering, besides the apparatuses of two-phase flows there is an extremely broad region of three-phase systems, where the third phase constitutes the catalyst in form of solid particles (Duduković et al., 2002; Martinez et al., 1999) in either fixed bed or slurry reactors. Therefore, the goal of this study is to develop macroscopic, averaged balances of mass, momentum and energy for systems with three-phase flow. Local instantaneous conservation equations are derived, which constitute the basis of the method applied, and are averaged by means of Euler’s volumetric averaging procedure. In order to obtain the final balance equations which define the averaged variables of the system, the weighted averaging connected with Reynolds decomposition is used. The derived conservation equations of the trickle-bed reactor (mass, momentum and energy balance) and especially the interphase effects appearing in these equations are discussed in detail.
Źródło:
Chemical and Process Engineering; 2014, 35, 1; 75-96
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Instability and the formation of bubbles and the plugs in fluidized beds
Autorzy:
Schulz, P.
Powiązania:
https://bibliotekanauki.pl/articles/2050193.pdf
Data publikacji:
2004
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
multiphase flow
bubbling
linear and non linear instability
dispersion relation
periodic plugs (or slugs)
Opis:
This is an review paper, particulary concentrate on results not many researches by reason that are explain in the text. We consider stability of disperse, two-phase flow (gas-solid particles or liquid-solid particles) linear and non-linear. In particular we discuss the result of Anderson, Sundareson and Jackson (1995) [3] that for vertical dispersion flow one- and two-dimensional, they attack problem growing disturbances directly by numerical integration of equations of motion from given initial conditions (using computer Cray C-90). In principle, this would allow authors to explore all aspects of dynamical behaviour of fluidized beds. It is interesting mechanism of periodic plug describing by Anderson et al. and attest by other researchers. Second part of paper is more general, dedicate the problem of linear stability of uniformly fluidized state ("fluidized bed"). We make the most important stages of calculations (after to Jackson (2000) [23]) and demonstrate that the majority (but not all) of fluidized beds with parameters having technical importance is unstable, or stable in narrow interval of wave numbers k.
Źródło:
Opuscula Mathematica; 2004, 24, 1; 133-159
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational fluid dynamics methods in turbomachinery
Autorzy:
Chmielniak, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/1953985.pdf
Data publikacji:
1998
Wydawca:
Politechnika Gdańska
Tematy:
computational fluid dynamics CFD
CFD
turbomachinery
numerical methods
modelling
steady flow
unsteady flow
multiphase flow
multicomponent flow
blade cooling
Opis:
This paper aims to present a general view of flow problems in turbomachinery and the current levels of numerical methods for solving these problems. The flow models used for modelling phenomena in blade cascades are presented. Models of turbulence are discussed. A variety of examples of turbomachinery problems, such as steady, unsteady, multiphase and multicomponent flows, and also blade cooling are described. The actual research fields of computational fluid mechanics are presented.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 205-213
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of guide vane positions in bended inflow of mechanical draft wet-cooling tower
Autorzy:
Klimanek, A.
Musioł, T.
Stechman, A.
Powiązania:
https://bibliotekanauki.pl/articles/240167.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chłodnia wody obiegowej
optymalizacja
projekt mechaniczny
przepływ wielofazowy
mechanical draft wet-cooling towers
multiphase flow
optimization
Opis:
Optimization of vane positions in a mechanical draft wet-cooling tower is presented in this paper. The originally installed, equally spaced, vanes produced non-uniform air velocity distribution reducing the performance of the fill of the cooling tower. A 2D CFD model of the tower has been created. The model has then been used to determine the objective function in the optimization procedure. The selected objective function was the standard deviation of the velocity of air entering the fill. The Goal Driven Optimization tools of the ANSYS Workbench 2.0 have been used for the optimization and the ANSYS Fluent 13.0 as a flow solver. The optimization allowed reduction of the objective function and producing a more uniform air flow.
Źródło:
Archives of Thermodynamics; 2011, 32, 3; 263-272
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and simulation of a multienergy gamma ray absorptiometry system for multiphase flow metering with accurate void fraction and water-liquid ratio approximation
Autorzy:
Khayat, Omid
Afarideh, Hossein
Powiązania:
https://bibliotekanauki.pl/articles/147267.pdf
Data publikacji:
2019
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
multiphase flow measurement
void fraction
water-liquid ratio
flow regime
MCNP
artificial neural network
reżim przepływu
sztuczna sieć neuronowa
Opis:
Multiphase flow meters are used to measure the water-liquid ratio (WLR) and void fraction in a multiphase fluid stream pipeline. In the present study, a system of multiphase flow measurement has been designed by application of three thallium-doped sodium iodide scintillators and a radioactive source of 133Ba simulated by Monte Carlo N-particle (MCNP) transport code. In order to capture radiations passing across the pipe, two direct detectors have been installed on opposite sides of the radioactive source. Another detector has been placed perpendicular to the transmission beam emitted from the 133Ba source to receive radiations scattered from the fluid flow. Simulation was done by the MCNP code for different volumetric fractions of water, oil, and gas phases for two types of flow regimes, namely, homogeneous and annular; training and validation data have been provided for the artificial neural network (ANN) to develop a computation model for pattern recognition. Depending on applications of the neural system, several structures of ANNs are used in the current paper to model the flow measurement relations, while the detector outputs are considered as the input parameters of the neural networks. The first, second, and third structures benefit from two, three, and five multilayer perceptron neural networks, respectively. Increasing the number of ANNs makes the system more complicated and decreases the available data; however, it increases the accuracy of estimation of WLR and gas void fraction. According to the results, the maximum relative difference was observed in the scattering detector. It was clear that transmission detectors would demonstrate the difference between the flow regimes as well. It is necessary to note that the error calculated by the MCNP simulator is <0.5% for the direct detectors (TR1 and TR2). Due to the difference between the data of the two flow regimes and the errors of data in the simulation codes of the MCNP, it was possible to separate these flow regimes. The effect of changing WLR on the efficiency for a constant void fraction confi rms a considerable variance in the results of annular and homogeneous flow s occurring in the scattering detector. There is a similar trend for the void fraction; hence, one can easily distinguish changes in efficiency due to the WLR. Analysis of the simulation results revealed that in the proposed structure of the multiphase flow meter and the computation model used for simulation, the two flow regimes are simply distinguishable.
Źródło:
Nukleonika; 2019, 64, 1; 19-29
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of turbulence damping in the OpenFOAM multiphase flow solver interFoam
Autorzy:
Polansky, Jiri
Schmelter, Sonja
Powiązania:
https://bibliotekanauki.pl/articles/2091357.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiphase flow
stratified flow
turbulence damping
computational fluid dynamics
OpenFOAM
Reynolds-averaged Navier–Stokes
Detached Eddy Simulation
Delayed Detached Eddy Simulation
Opis:
In the presented work Egorov’s approach (adding a source term to the ω-equation in the k-ω model, which mimics the damping of turbulence close to a solid wall) was implemented in on the subclass of shear stress transport models. Hence, turbulence damping is available for all shear stress transport type models, including hybrid models that are based on the ω-equation. It is shown that turbulence damping improves the prediction of the axial velocity profile not only for Reynolds-averaged Navier–Stokes simulation but also for detached eddy simulation and delayed detached eddy simulation models. Furthermore, it leads to a more realistic estimation of the pressure drop and, hence, to a more correct prediction of the liquid level. In this paper, simulation results for four different turbulence models are presented and validated by comparison with experimental data. Furthermore, the influence of the magnitude of the damping factor on the pressure drop in the channel is investigated for a variety of different gas-to-liquid flow rate ratios. These investigations show that higher gas-to-liquid flow rate ratios require higher damping factors to correctly predict the pressure drop. In the end, advice is formulated on how an appropriate damping factor can be determined for a specific test case.
Źródło:
Archives of Thermodynamics; 2022, 43, 1; 21--43
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of particle loading in deep-bed filter. Trasport, deposition and reentrainment
Autorzy:
Przekop, R.
Gradoń, L.
Powiązania:
https://bibliotekanauki.pl/articles/184879.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
filtration
lattice Boltzmann
Brownian dynamics
multiphase flow
porous media
filtrowanie
metoda kratowa Boltzmanna
dynamika Browna
przepływ wielofazowy
ośrodek porowaty
Opis:
Deep bed filtration is an effective method of submicron and micron particle removal from the fluid stream. There is an extensive body of literature regarding particle deposition in filters, often using the classical continuum approach. However, the approach is not convenient for studying the influence of particle deposition on filter performance (filtration efficiency, pressure drop) when non-steady state boundary conditions have to be introduced. For the purposes of this work the lattice-Boltzmann model describes fluid dynamics, while the solid particle motion is modeled by the Brownian dynamics. For aggregates the effect of their structure on displacement is taken into account. The possibility of particles rebound from the surface of collector or reentrainment of deposits to fluid stream is calculated by energy balanced oscillatory model derived from adhesion theory. The results show the evolution of filtration efficiency and pressure drop of filters with different internal structure described by the size of pores. The size of resuspended aggregates and volume distribution of deposits in filter were also analyzed. The model enables prediction of dynamic filter behavior. It can be a very useful tool for designing filter structures which optimize maximum lifetime with the acceptable values of filtration efficiency and pressure drop.
Źródło:
Chemical and Process Engineering; 2016, 37, 3; 405-417
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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