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Wyświetlanie 1-15 z 42
Tytuł:
Oil pressure distribution in conical ring gaps
Rozklady cisnienia oleju w szczelinach pierscieniowych stozkowych
Autorzy:
Zloto, T.
Kowalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/793712.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
piston-cylinder pump
pressure distribution
oil pressure distribution
conical ring gap
piston pump
hydraulic motor
Navier-Stokes equation
viscosity
hydraulic system
computational model
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 2
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A systematic analysis of the friction losses on bearings of modern turbocharger
Autorzy:
Vanhaelst, R.
Kheir, A.
Czajka, J.
Powiązania:
https://bibliotekanauki.pl/articles/134027.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
friction power
test rig
turbocharger
floating bearing
ball bearing
oil temperature
oil pressure
thrust force
moc tarcia
stanowisko badawcze
turbosprężarka
łożysko swobodne
łożysko kulkowe
temperatura oleju
ciśnienie oleju
siła odporu
Opis:
In the article, a novel test rig for determining the friction losses of modern turbocharger is presented. The friction torque of the bearing of turbocharger can be measured direct and stationary at any speed up to 100,000 min–1 by the friction test rig developed by the Ostfalia, University of Applied Science (UAS). Since 2010, over 50 turbochargers were measured on the test bench in extensive measurement series. The results give valuable and new insights of the influence of the next parameters on the bearing friction losses: oil temperature, oil pressure, thrust force and oil flow rate. Furthermore, a comparison between the different bearing types (semi-floating, full floating and ball bearings) was performed. The main observations and results are discussed in the scientific article.
Źródło:
Combustion Engines; 2016, 55, 1; 22-31
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Issledovanie konstrukcijj rabochikh organov maslootzhimnykh pressov
Research structures of working bodies oil press
Autorzy:
Streltsov, V.
Powiązania:
https://bibliotekanauki.pl/articles/76286.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
oil pressing
necessary process
pressure
squeezing
vegetable oil
effectiveness
efficiency
productivity
quality
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 2
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Pressure agglomeration of biomass with additive of rapeseed oil cake or calcium carbonate
Aglomeracja ciśnieniowa biomasy z dodatkiem makuchów rzepakowych lub węglanu wapnia
Autorzy:
Lisowski, A.
Dabrowska-Salwin, M.
Swietochowski, A.
Motyl, T.
Pajewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/793697.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
pressure agglomeration
pellet
calcium carbonate
rapeseed oil
rapeseed oil cake
mechanical durability
biomass
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD analysis of pressure distribution in slide conical bearing lubricated with non-Newtonian oil
Autorzy:
Czaban, A.
Powiązania:
https://bibliotekanauki.pl/articles/241851.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
slide conical bearing
CFD
non-Newtonian oil
pressure distribution
Źródło:
Journal of KONES; 2013, 20, 3; 117-124
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integration and verification of miniature fluid film pressure sensors in hydrodynamic linear guides
Autorzy:
Ibrar, Burhan
Wittstock, Volker
Regel, Joachim
Dix, Martin
Powiązania:
https://bibliotekanauki.pl/articles/24084705.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
hydrodynamic linear guide
measurement technology
oil film
pressure measurement
Opis:
Previously, a 2D simulation model for hydrodynamic linear guides with two reduction factors has been developed to calculate oil film pressure and floating heights/angle numerically. However, no method was available to verify the oil film pressure experimentally but only with floating heights measurement. Therefore, different pressure sensor’s integration methods were tested in a stationary Plexiglas rail to measure fluid film pressure inside the lubrication gap. The pressure sensors were statically and dynamically calibrated. However, floating heights could not be measured with the preliminary used Plexiglas rail. This paper reports the suitable integration of pressure sensors into a stationary steel rail to compensate this drawback. It focuses on the measurement of pressure rise using pressure sensors inside the lubrication gap in combination with the floating heights. Experimental results have shown that the oil film pressure inside the lubrication gap can be measured using pressure sensors, which draw conclusions about cavitation and lack of lubrication. The variation of oil film pressure measured along the length of the carriage can be used to improve the simulation model i.e. the reduction factors. The pressure measurement can help to identify the lubrication conditions and further actions can be taken to improve the lubrication cycle.
Źródło:
Journal of Machine Engineering; 2023, 23, 3; 38--55
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adhesion influence on the oil velocity and friction forces in hyperbolic microbearing gap
Autorzy:
Wierzcholski, K.
Miszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/247611.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
adhesion forces
hyperbolic micro-bearing
oil velocity
hydrodynamic pressure
Opis:
In this paper are presented the influences of the adhesion forces occurring in hyperbolic micro contact on the oil velocity and friction forces in hyperbolic micro bearing gap. Here are elaborated the dependences between adhesive forces and oil dynamic viscosity in super thin boundary layer and influences of adhesive forces on the oil velocities and friction forces in micro- and nano-scale arising between two cooperating hyperbolic surfaces in micro-bearings. Oil dynamic viscosity is a sum of classical viscosity and viscosity caused by adhesion and cohesion forces. In hyperbolic micro-bearing the influence of adhesive forces on friction forces is visible not only in friction forces caused by the hydrodynamic pressure but also in friction forces caused by the oil flow velocity. The pressure distributions and capacity values in machine hyperbolic slide micro-bearings are determined in the lubrication region which is defined on the micro-bearing surfaces. Numerical calculations are performed in Mathcad 14 Professional Program implemented by virtue of difference method. In this paper are derived the formulas for velocity components, pressure distributions, friction forces and friction coefficients in hyperbolic coordinates and at the same time the adhesion forces are considered. Up to now the influence of adhesion forces on oil velocity and friction force changes in hyperbolic micro-bearing gap were not considered in analytical way. Present paper elaborat es the preliminary assumptions of hydrodynamic theory of lubrication for hyperbolic micro-bearing in the case if during the lubrication the adhesion forces are taken into account.
Źródło:
Journal of KONES; 2010, 17, 3; 483-489
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the efficiency of restrained oil displacement using of enhancing oil recovery methods
Autorzy:
Uhrynovskyi, A. V.
Moroz, L. B.
Kogut, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/2055748.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
oil
field
oil recovery coefficient
tertiary method
formation pressure maintenance
ropa naftowa
pole
współczynnik odzysku
Opis:
Purpose: The purpose of this article is to highlight the main problems that arise during the final stage of oil field development. Based on the identified problems using the EORgui program, Petroleum Solutions Ltd it is necessary to select the most effective method to increase oil recovery and study the most optimal tertiary oil recovery method using a hypothetical field model as an example, which will ensure the maximum oil recovery factor. Design/methodology/approach: Study of oil tertiary displacement efficiency by applying tertiary methods were performed using EORgui software from Petroleum Solutions Ltd and Petrel from Shlumberger. Findings: The results of the research show that the most optimal method of oil recovery increasing for this hypothetical field is the injection of carbon dioxide. When using this method, the oil recovery rate reaches 23%. Research limitations/implications: When using carbon dioxide, it is necessary to have sources of supply near the field, as well as increased corrosion of petroleum equipment is possible to occur. Practical implications: The use of the proposed approach is an important condition for the effective extraction of residual oil reserves for most fields developed using the reservoir pressure maintenance system. Originality/value: The article presents the characteristic features of residual oil location, reveals the conditions for effective usage of methods to increase oil recovery and their selection procedure.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 110, 1; 27--34
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure in slide journal plane bearing by laminar unsteady oil flow
Autorzy:
Krasowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/247887.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
journal plane bearing
lubrication
unsteady laminar oil flow
pressure distribution
Opis:
This paper shows results of numerical solutions a modified Reynolds equation for laminar unsteady oil flow in slide journal plane bearing gap. It shows a preliminary analysis of pressure distribution change in the bearing by laminar, unsteady lubrication caused by velocity perturbations of oil flow in the longitudinal direction of a bearing. Described effect can be used as an example of modelling the bearing friction node operations in reciprocating movement during exploitation of engines and machines. Plane crossbar journal bearing occur in ship combustion engine as a crosshead bearing. During modelling crossbar bearing operations in combustion engines, bearing movement perturbations from engine vertical vibrations causes velocity flow perturbations of lubricating oil on the bearing race and on the bearing slider in the longitudinal direction. Engine forced vertical vibrations frequency and crankshaft forced torsional vibrations is determined by shaft rotational speed, engine cylinder number and by engine type. This solution example applies to isothermal bearing model with infinity length. Lubricating oil used in this model has Newtonian properties and dynamic viscosity in dependence on pressure. Results are presented in the dimensionless hydrodynamicpressure diagrams.
Źródło:
Journal of KONES; 2007, 14, 3; 297-303
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation the Effect of Adding Oil Shale Ash on the Compressive Strength of Concrete
Autorzy:
Gougazeh, Mousa
Powiązania:
https://bibliotekanauki.pl/articles/2201819.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
oil shale ash
compressive strength
compaction pressure
combustion
construction
sustainable
Opis:
In the present study, the effect of cementing properties of oil shale ash on the compressive strength of the concrete mixtures produced from oil shale ash, cement, sand, and water was investigated. The used shale ash was produced by direct combustion at 830oC in a laboratory muffle furnace of the El-Lajjun oil shale. Based on the chemical composition of shale ash (OSA), it was concluded that this material consists of a high percentage of CaO which forms the properties of cement materials as well as the contents of SiO2, Al2O3, and Fe2O3 form the properties of pozzolanic materials. Oil shale ash (OSA) materials have diverse applications as alternative materials for the construction industry and construction technology to reduce environmental risks and achieve sustainability. The results showed that the pressed specimen with 40 wt. % OSA content, 50 wt. % sand content and 30% MW obtained the highest compressive strength of about 9.1 MPa after 28 days of hardening. The highest value of 28 days compressive strength for a compacted specimen containing 35 wt. % OSA and 35% MW were achieved with 12 MPa at a compaction pressure of between 25 and 30 MPa. High compressive strength values were found to be achieved in the compressed specimens by controlling mixing water. It is also indicated that the compressive strength increases as OSA content in the compressed specimen increases and increases as compaction pressure increases.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 4; 130--137
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of pressure on dynamic viscosity of oil
Autorzy:
Czaban, A.
Frycz, M.
Powiązania:
https://bibliotekanauki.pl/articles/242263.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
dynamic viscosity
engine oil
pressure dependence
temperature dependence
shear rate
Opis:
The viscosity of lubricant is physical quantity, which has major impact on slide bearings and micro-bearings functioning parameters. Applying computer simulations as a tool to study the hydrodynamic lubrication phenomenon, researcher should create a computational model as close as possible to the real object, therefore the knowledge about a viscosity dependence on temperature and shear rate of bearing lubricating oil is essential in simulations of slide bearings hydrodynamic lubrication. This paper present research, which show, that also an influence of pressure on oil dynamic viscosity should be taken into consideration. The aim of this work is to determine the influence of pressure on the dynamic viscosity of lubricating oil. In this research the selected new and used engine oils were investigated. The dynamic viscosity of oil was measured at different pressures and temperatures in the function of shear rate. In this work the engine oils of passenger vehicles were investigated. The viscosity measurements for new and used lubricating oils were made with the Thermo Scientific Haake Mars III rheometer. The received information will be used in the simulations of hydrodynamic lubrication of slide bearings and microbearings. Fitting viscosity curves, described by a viscosity model adopted in simulations, to the experimental data, obtained for motor oils, will allow to find the values of coefficients of that model. The determined coefficients will be set in the relationship defined by the adopted viscosity model, implemented in the used for simulations CFD software. Collected data may also be useful for designing bearings and sliding friction pairs.
Źródło:
Journal of KONES; 2013, 20, 2; 49-54
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized Newtonian fluids as lubricants in the hydrodynamic conical bearings : a CFD analysis
Autorzy:
Czaban, A.
Powiązania:
https://bibliotekanauki.pl/articles/242462.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
hydrodynamic conical bearing
generalized Newtonian fluid
CFD
non-Newtonian oil
pressure distribution
dynamic viscosity
ferro-oil
Opis:
Additives, ageing or wear and impurities can cause, that relationship between shear stress and shear rate in a lubricating oil is or becomes non-linear, and due to this, a significant change in the values of operating parameters of slide hydrodynamic bearings may occur. It is important to take into account such dependence during design and simulations of slide bearings. The calculations, which consider the non-linear properties of the lubricating oil, can be carried out by adopting the generalized Newtonian fluid models. This paper shows the result of CFD simulation of slide conical bearings hydrodynamic lubrication, assuming that the lubricating oil behaves as a generalized Newtonian fluid. The hydrodynamic pressure distributions, load carrying capacities and friction torques were calculated for bearings lubricated with different types of generalized Newtonian fluids and the obtained data were compared. In the study, the following models of fluids were adopted: the Power-law fluid (Ostwald-de Waele), the Cross fluid and the Carreau fluid. The coefficients of mentioned relationships were determined by fitting the curves described by each model to the experimental data using the least squares approximation method. The calculations of hydrodynamic pressure distributions, load carrying capacities and friction torques were carried out using the commercial CFD software Ansys Fluent from the Ansys Workbench 2 platform.
Źródło:
Journal of KONES; 2016, 23, 2; 89-95
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crude oil transfer safety analysis and oil spills prevention in port oil terminal
Autorzy:
Blokus, Agnieszka
Kwiatuszewska-Sarnecka, Bożena
Wilczyński, Przemysław
Wolny, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2068697.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
oil port terminal
oil transfer
operation process
system reliability
oil spill
human factor
pressure upsurge
safety procedures
ESD System
LCH Simulator
Opis:
The paper describes the problem of crude oil transfer in a port oil terminal and includes the safety analysis of this operation and analysis of potential causes and possible scenarios of oil spill events in a port terminal. The operation process of crude oil transfer is described and its statistical identification is given. The reliability and availability analysis of the system of crude oil transfer in a port terminal is performed. Moreover, analysis of crude oil transfer process taking into account the human factor is provided. The Fault Tree Analysis and sensitivity analysis for oil spill event in a port terminal is proposed to identify and analyse potential causes and possible scenarios of oil spill. Introducing methods for the prevention of oil spills, special attention is paid to safety procedures during liquid cargo transfer. Technical solutions used in oil terminals are described and recommendation regarding the Emergency Shutdown System are given. Additionally, associated safety systems, such as surge relief system, are described. Emphasizing the role of human factor in the process of crude oil transfer and its safety, trainings on the Liquid Cargo Handling Simulator are proposed to improve skills and knowledge of personnel on board and ashore.
Źródło:
Journal of Polish Safety and Reliability Association; 2019, 10, 1; 1--42
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capacity forces in slide journal plane bearing by laminar unsteady lubrication
Autorzy:
Krasowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/247548.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
journal plane bearing
lubrication
unsteady laminar oil flow
pressure distribution
capacity forces
Opis:
This paper shows results of numerical solutions an modified Reynolds equations for laminar unsteady oil flow in slide journal bearing with planar linear gap. Discussed case of the solution to the Reynolds equation for the unsteady laminar Newtonian flow of lubricating factor allows initial estimation of hydrodynamic pressure distribution and its capacity as a basic operational parameter of the slide bearing. Unsteady axial velocity perturbation on the race surface and slide has influence on the hydrodynamic pressure distribution of the capacity of the lubricated gap. Pressure changes in the bearing are seasonal and equal to the lasting period of velocity perturbation. The level of changes and its nature depends on the kind of perturbation. This solution example applies to isothermal bearing model with infinity length. Lubricating oil used in this model has Newtonian properties and dynamic viscosity in dependence on pressure. It shows a preliminary analysis change of capacity forces in the bearing by laminar, unsteady lubrication caused by velocity perturbations of oil flow in the longitudinal direction of a bearing. Described effect can be used as an example of modeling the bearing friction node operations in reciprocating movement during exploitation of engines and machines. Plane crossbar journal bearing occur in ship combustion engine as a crosshead bearing. Results are presented in the dimensionless hydrodynamic pressure and capacity force diagrams.
Źródło:
Journal of KONES; 2008, 15, 3; 245-252
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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