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Wyświetlanie 1-15 z 120
Tytuł:
Differences method topology of hydrodynamic pressure calculations from Reynolds equation
Autorzy:
Wierzcholski, K.
Powiązania:
https://bibliotekanauki.pl/articles/246229.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Reynolds equation
new numerical solution
urvilinear boundary conditions
Opis:
The main topic of the presented paper concerns the method of determination and calculations of the general and particular numerical solutions of modified Reynolds equation in curvilinear orthogonal coordinates for curvilinear boundary conditions for hydrodynamic pressure distributions in bearing gap. A general solution matrix was derived and determined for various orthogonal coordinates of two cooperating bearing surfaces separated by the oil existing in slide Journal bearings. From mathematical point presented method of solution of modified Reynolds equation leads this problem to resolving the partial recurrence non homogeneous, linear equation of second order with variable coefficients. As an example the numerical hydrodynamic pressure calculation for slide bearing two cylindrical surfaces limited bearing gap with various eccentricities was in this paper performed. In numerical calculations are applied the formulae and calculation algorithm derived in this paper. Moreover, presented numerical topology of calculations in this paper enables to find the optimum way of determination of pressure values for an applied difference method regarding to the stability of solutions, convergences of the obtained values with various orthogonal shapes of cooperating surfaces. An adaptation of the known numerical difference method to the various curvilinear orthogonal boundary conditions applied during the hydrodynamic pressure determination on the two various curvilinear cooperating surfaces, to be decisive after author knowledge about a new achievement consisted in presented paper.
Źródło:
Journal of KONES; 2010, 17, 4; 583-590
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interview with Bryan Reynolds
Autorzy:
Kujawińska Courtney, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/648291.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Opis:
-
Źródło:
Multicultural Shakespeare: Translation, Appropriation and Performance; 2018, 18, 33; 11-21
2083-8530
2300-7605
Pojawia się w:
Multicultural Shakespeare: Translation, Appropriation and Performance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uwagi na marginesach „Dzieł” sir Joshuy Reynoldsa: Williama Blake’a spor z Reynoldsem o sztukę
William Blake ’s annotations to Reynolds “Discourses ”: William Blake ’s Quarrel with Reynolds on art
Autorzy:
Jaźwierski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/707133.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Blake
Reynolds
art theory
teoria sztuki
Opis:
William Blake’s annotations to the first volume of “The Works of Sir Joshua Reynolds” prove an excellent and at the same time fascinating source of knowledge about his views on art. They depict Blake as a rebel against the established rules in English artistic life of the late 18th and early 19th centuries. The poet identifies their origin in the beliefs and artistic policies of the first President of the Royal Academy, Sir Joshua Reynolds. This article, a commentary to the translated version (in the same volume) of “Annotations”, at its core primarily attempts to highlight theoretical and artistic issues, but does not shy away from biographical, social and political topics necessary to an understanding of Blake’s artistic and personal views. Relations between the two adversaries, strained ever since Blake’s studies at the Royal Academy in the first half of the 1780s, took on a mythical character of enmity after Reynolds’ death. Blake was the first to criticize the highly regarded Seven Discourses on Art by Reynolds, where - not always fairly – he saw proof of theoretical contradictions and the decline of art. The clash between Reynolds’ aesthetic rationalism and empiricism and Blake’s mysticism precluded the possibility of agreement. All this does not mean, however, that the dispute between Blake and Reynolds was free of paradoxes and ambiguities and that his mind was completely detached from the academicism and classicism of official English art. On the contrary. This article tries to show that, like any radical rebel, Blake largely belonged to the world from which he tried to break away, that his art grew out of 18th-century categories and can best be understood as such.
Źródło:
Rocznik Historii Sztuki; 2012, 37; 129-140
0080-3472
Pojawia się w:
Rocznik Historii Sztuki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristic of Vertical Reynolds Shear Stress in a Patchy Heterogeneous Open Channel
Autorzy:
Olatunji, Peter Folorunso
Powiązania:
https://bibliotekanauki.pl/articles/1177793.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Reynolds Stress
gravel
heterogeneous
open channel
patchy
turbulence
vegetation
Opis:
In turbulent flow, the Reynolds stress provides an understanding of the shear dispersion within the flow. Turbulence can be said to have an effect equivalent to the Reynolds shear stresses and are indicators of turbulence transport. This paper examined the characteristic of vertical Reynolds Shear stress in a patchy heterogeneous open channel using two experimental conditions for flexible and rigid vegetation interaction with gravel bed. The results show the value of vertical Reynolds stress decreases downstream along the channel section and as the distance from change in roughness increases. This is attributed to the effects of the bed roughness configuration (due to the preceding vegetated bed roughness) on the vertical Reynolds stress distribution. However, the position of maximum vertical Reynolds stress is located near bed over the vegetated zone. This provides an indication that the vegetated bed serves as the primary source of turbulence for the flow.
Źródło:
World Scientific News; 2018, 99; 1-14
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differential and recurrence unified reynolds equations and mega algorithm for their numerical solutions
Autorzy:
Wierzcholski, K.
Miszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/242919.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
partial differential form
partial recurrence form
unified Reynolds equation
mega algorithm
Opis:
The objective of the research under the paper topic is an analytical, unified formulation of a new standardized view of general solution of hydrodynamic problem using algorithm to determine changes of the components of the velocity vector, the distributions of hydrodynamic pressure, load carrying capacity, of slide bearings with cooperating curvilinear, orthogonal surfaces that are lubricated with a various non-Newtonian lubricants. In this paper for non- Newtonian lubricants are questioning the hitherto prevailing assumptions using in hydrodynamic theory of lubrication such as constant value of lubricant viscosity and pressure in the thickness of lubricating gap i.e. in gap height direction. Finally, the non-homogeneous partial differential equation generated with variable coefficients that is the result of the various boundary conditions being imposed that are different for each problem solved is an equation that determines the distributions of hydrodynamic pressure values. This equation is to be written in the form of a unified non-homogenous partial recurrence equation with variable coefficients. The Authors foresee that a mega-algorithm will be developed for the solution of this equation in a numerical form. This equation in particular cases is an equivalent of modified Reynolds equations in the research that has been conducted so far concerning the hydrodynamic theory of lubrication.
Źródło:
Journal of KONES; 2012, 19, 4; 643-650
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uwagi na marginesach "Dzieł" sir Joshuy Reynoldsa, wyd. Edmond Malone, Londyn 1798
Annotations to Reynolds “Discourses, ed. Edmond Malone, Londyn 1798
Autorzy:
Blake, William
Jaźwierski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/706962.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Blake
Reynolds
Annotations
Uwagi
Opis:
Polish translation of Wiliam Blake's Annotations to Reynolds' Discourses
Źródło:
Rocznik Historii Sztuki; 2012, 37; 141-164
0080-3472
Pojawia się w:
Rocznik Historii Sztuki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Reynolds transport theorem for three phase systems with storage in interfaces
Autorzy:
Skiepko, T.
Powiązania:
https://bibliotekanauki.pl/articles/239942.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transportowy teoremat Reynoldsa
trójfaza
zasób na granicy rozdziału faz
interface storage
Reynolds transport theorem
three phases
Opis:
In the paper, the Reynolds transport theorem (RTT) for three phase systems is developed, in terms associated with a moving control volume. The basic tools applied to the derivation are the generalized transport theorem by Truesdell and Toupin, and generalized surface transport theorem by Aris as well as Slattery. The final results referenced to a generic extensive quantity demonstrate the theorem in the integral instantaneous from. As a further illustration of applicability of the theorem relation developed some specific forms are deduced from such as for multiphase systems in terms of fixed control volume, surface systems and homogeneous spatial systems.
Źródło:
Archives of Thermodynamics; 2011, 32, 1; 21-44
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Noise radiation from circular rods at low-moderate Reynolds number
Autorzy:
Kopania, Joanna Maria
Bogusławski, Grzegorz
Gaj, Patryk
Wójciak, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/128113.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
aeroacoustic noise
circular rod
low Reynolds number
hałas aeroakustyczny
pręt kołowy
niska liczba Reynoldsa
Opis:
The well-known dominant sources of airframe noise are associated with unsteadiness of separated and/or vortical flow regions around the high-lift system (flaps, slats) and the aircraft undercarriage (landing gear). Current practical landing gear noise prediction models are individual component - based, which means that the various components are divided into groups according to the frequency range, in which they predominantly radiate noise. Since the far-field noise spectra are approximately Strouhal - based, the emitted frequency is assumed to be directly related to their size: the large elements are responsible for the low frequency region of the spectra, and the small components for the high frequency region. On the basis of such understanding of the noise generation mechanism, the special configurations that lead to considerable noise suppression were proposed. One element of these configurations are rods with different shape and cross section. In this work the situation when circular rods are in area of laminar-turbulent flow were analysed. The measurements were carried out for single circular rod with different diameters to study the noise effect depended on Reynolds number. Far field noise for broad range of Reynolds numbers was also examined depending on distance from the source of noise.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EuroShakespace and the Witness-Function: Convergences of History, Memory, and Affective Presence
Autorzy:
Reynolds, Bryan
Powiązania:
https://bibliotekanauki.pl/articles/648184.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Źródło:
Multicultural Shakespeare: Translation, Appropriation and Performance; 2007, 4
2083-8530
2300-7605
Pojawia się w:
Multicultural Shakespeare: Translation, Appropriation and Performance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiar kryzą segmentową strumienia medium dla małych liczb Reynoldsa
Measurement with segmental orifice of flow medium for small Reynolds numbers
Autorzy:
Mrowiec, A.
Kasprzak, D.
Powiązania:
https://bibliotekanauki.pl/articles/267014.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
kryza segmentowa
liczba Reynoldsa
współczynnik przepływu
segmental orifice
Reynolds number
flow factor
Opis:
Podstawowym surowcem energetycznym w Polsce jest węgiel. W ostatnich latach podejmowano próby spalania koloidalnych zawiesin pyłu węglowego w oleju napędowym lub opałowym. Przy pomiarach przepływu takich zawiesin, może dochodzić do wytrącania i zalegania w układach przesyłowych osadów, co w efekcie może prowadzić do zaburzeń strumienia przepływu. Wiarygodność pomiaru tego parametru, mogą zapewnić kryzy segmentowe. W artykule zaprezentowano wyniki badań przepływowych kryz segmentowych z przytarczowym punktowym odbiorem ciśnienia różnicowego, przy niewielkich liczbach Reynoldsa oraz symulacje numeryczne dla wybranej kryzy. W badaniach jako medium wykorzystano wodę.
In Poland coal is the main energy resource. As part of the conducted research attempts were made at using suspensoids containing coal dust in gas oil and furnace oil. This leads to a reduction in NOx and SOx percentage without the need for an expensive desulphurization and dust extraction installation. However, there is a need for using cheap but reliable systems to measure the flow of the injected fuel. In real operating conditions various residues may often deposit in fuel transmission systems, which in turn can lead to flow fluctuations. Reliable flow factor measurement requirements can be met by segmental orifices. In the article, based on a research and measurement station, presented were the results of flow measurements with segmental orifices with point reception of differential pressure for small Reynolds numbers as well as numerical simulations. For the selected segmental orifice the flow factor characteristic in the function of the Reynolds number was calculated. In the research, water was used as the medium; the next stage of the research will involve the realization of the proposed solution with the use of hydraulic oil.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 49; 75-78
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical computation of low Reynolds number viscous flow past bluff bodies
Autorzy:
Tarafder, Md. Shahjada
Mursaline, Miad Al
Powiązania:
https://bibliotekanauki.pl/articles/1839825.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ
płyn lepki
liczba Reynoldsa
współczynnik oporu
viscous flow
low Reynolds number
SIMPLE algorithm
circular cylinder
square cylinder
drag coefficient
Opis:
This article presents a two-dimensional steady viscous flow simulation past circular and square cylinders at low Reynolds numbers (based on the diameter) by the finite volume method with a non-orthogonal body-fitted grid. Diffusive fluxes are discretized using central differencing scheme, and for convective fluxes upwind and central differencing schemes are blended using a ‘deferred correction’ approach. A simplified pressure correction equation is derived, and proper under-relaxation factors are used so that computational cost is reduced without adversely affecting the convergence rate. The governing equations are expressed in Cartesian velocity components and solution is carried out using the SIMPLE algorithm for collocated arrangement of variables. The mesh yielding grid-independent solution is then utilized to study, for the very first time, the effect of the Reynolds number on the separation bubble length, separation angle, and drag coefficients for both circular and square cylinders. Finally, functional relationships between the computed quantities and Reynolds number (Re) are proposed up to Re = 40. It is found that circular cylinder separation commences between Re= 6.5-6.6, and the bubble length, separation angle, total drag vary as Re, Re-0.5, Re-0.5 respectively. Extrapolated results obtained from the empirical relations for the circular cylinder show an excellent agreement with established data from the literature. For a square cylinder, the bubble length and total drag are found to vary as Re and Re-0.666, and are greater than these for a circular cylinder at a given Reynolds number. The numerical results substantiate that a square shaped cylinder is more bluff than a circular one.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 133-157
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 120

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