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Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
2003 nr 21 207-212
EN This contribution is devoted to the theory of the mathematical modelling of turbulent compressible fluid flow. The paper briefly reviews the conservative system of the Navier-Stokes equations for laminar compressible flows. The Reynolds and Favre mass-averaging procedurę is introduced. The main atte[...]
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Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
2002 nr 18 421-426
EN The mathematical modelling of compressible flow belongs to challenging problems of internal aerodynamics, examples of which can be found in many areas of industry, for instance in screw compressors. This paper is deyoted to the numerical computation of the 3D stationary inviscid transonic flow in in[...]
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Journal of Theoretical and Applied Mechanics
1998 nr 3 535-560
PL Wpływ rzędu wielkości parametrów bezwymiarowych na wyniki procedury homogenizacji został pokazany na dwóch przykładach, z których pierwszy dotyczy homogenizacji bezpośredniej, a drugi używa metodologii klasycznej teorii homogenizacji. W pierwszym przykłądzie zilustrowano wpływ rzędu wielkości dwóch [...]
EN Basign on two examples a significant impact of the order of magnitude of demensionless parameters on the homogenisation process results when using either the direct averaging or classical homogenisation approach has been presented. First, the effect ot two dimensionless parameters on the results of[...]
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Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
2003 z. 22 63-66
EN The paper deals with an introduction to the flow of non-Newtonian fluids. In this contribution we limit ourselves to the case of the isothermal flow of a viscous incompressible fluid. In order to incorporate the effect of the rate of strain on the fluid characteristics the relevant type of constitut[...]
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Górnictwo Odkrywkowe
2010 R. 51, nr 3 273-278
PL W celu doprowadzenia wody do derywacji elektrowni wodnej buduje się specjalnego typu urządzenia hydrotechniczne zapewniające zasilanie turbiny wolne od zanieczyszczeń stałych niesionych przez wodę oraz posiadające możliwość regulowania, a nawet zupełnego zamknięcia dopływu. W pracy przedstawiono wyn[...]
EN Diversion duet of water power plant is supplied with water by the use of special type of hydrotechnical devices. The devices ensure that the water supplied to the turbine is free of solid contamination. They also have the possibility of regulating the flow or even cutting it off completely. This pap[...]
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Chłodnictwo : organ Naczelnej Organizacji Technicznej
PL Praca opisuje metody służące do odwzorowania rzeczywistych procesów cieplno-przepływowych w kanałach wymienników ciepła o falistej budowie oraz intensyfikacji i poprawy sprawności wymienników przemysłowych przy użyciu nowoczesnych metod komputerowych i doświadczalnych. Dla określonej geometrii kanał[...]
EN In this paper I described a computer simulation methods which are used in modelling of real flow processes with heat transfer in corrugated channels of industrial heat exchangers and there applicability to intense the process and improve the efficiency of the heat exchangers. This work is mainly foc[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN The paper presents the results of preliminary numerical calculations of a fluid flow in a channel with an obstacle. The flow problem was solved with an application of the finite elements method. Various geometries of obstacles were considered.
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
EN The pressure differential devices and averaging Pitot tubes belongs to the few methods of measuring the fluid flow which may be applied for flow with high temperature, pressure and velocity. The paper presents the numerical analysis of the flow around the orifice. The number of turbulence models is [...]
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Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
2006 z. 31 103-106
EN The paper deals with an introduction to the modelling of fluid flow by means of the smoothed particie hydrodynamics (SPH). This numerical approach is meshless and the computational grid is replaced by a finite set of interpolating points. The fluid flow is described by Euler equations using the Lagr[...]
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Geology, Geophysics and Environment
2015 Vol. 41, no. 1 127--128
EN Deformation bands and microfractures occurring in sandstones affect the petrophysical properties of the rock and determine fluid flow. Deformation bands are quasi-tabular structures, up to 5 mm thick that accommodate offsets on the order of a few centimeters (Fossen 2010). Such bands show different[...]
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AGH Drilling, Oil, Gas
2015 Vol. 32, no. 4 775--783
EN This paper presents the numerical results of a numerical analysis of drilling fluid flow through annular space in the borehole. The analysis used the Herschel–Bulkley rheological fluid model. The obtained results of the analysis for three cases with variable geometry. Variable geometry is associated[...]
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
EN In the paper results of numerical analysis of fluid flow of round jet inside cylindrical chamber with experimental data were compared. The influence of numerical grid density were tested. The Phoenics program for numerical calculation was used. The two-equations k-ε turbulence model proposed by Laun[...]
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
EN This paper presents the results of the investigations of a flow in the turbine cascade and is a contribution to development of both the numerical method and modification of upgrading of the mathematical models describing the flow physics in the turbine cascade. The objective is to classify the facto[...]
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Management and Production Engineering Review
EN The world around us is a very complex and multi-parametric system, like the weather, traffic, operation of machines, production processes, service processes, etc. Understanding of the characteristics, operation and behaviour of these systems and processes is not easy due to their complexity. The des[...]
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Journal of Theoretical and Applied Mechanics
2014 Vol. 52 nr 1 271--279
EN We consider the problem of fluid flow in a brain tumor. We develop a mathematical model for the one-dimensional fluid flow in a spherical tumor where the spatial variations of the interstitial velocity, interstitial pressure and the drug concentration within the tumor are only with respect to the ra[...]
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Archiwum Technologii Maszyn i Automatyzacji
PL Artykuł jest poświęcony modelowaniu numerycznemu pola temperatury z uwzględnieniem ruchu ciekłego metalu w strefie przetopienia oraz prognozowaniu numerycznego składu strukturalnego złącza spawanego metodą hybrydową laser-łuk elektryczny. Sprzężone zjawiska transportu ciepła w spawanym doczołowo pła[...]
EN The paper concerns numerical modelling of the temperature field with motion of liquid metal in the melted zone and estimation of the structure composition in the laser-arc hybrid welded joint. Coupled transport phenomena of heat transfer in butt welded plate and fluid flow in the melted zone were de[...]
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Zeszyty Naukowe. Mechanika / Politechnika Opolska
2010 z. 96 15-16
EN Correct flow measurements require a fully developed turbulent velocity profile in upstream straight section to measuring device. During fluid flow through local obstacles, velocity profiles becomes deformated. This paper proposes a new solution of flow conditioner, which combine advantages of vanes [...]
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Computer Methods in Materials Science
PL W ramach pracy zbudowany został model matematyczny procesu ciągłego odlewania stali oraz głównych zjawisk zachodzących w tym procesie. Model uwzględnia transport ciepła, przepływ cieczy i transport masy. Pozwala on na obliczanie pól temperatury i prędkości oraz profili rozkładu stężenia węgla i turb[...]
EN In the present work a mathematical model for the continuous casting process and its principal phenomena was developed. The model takes into account: heat transfer, fluid flow and mass transfer. The model allows the calculation of temperature, velocity, carbon concentration and turbulence variables p[...]
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Archives of Mechanics
EN In a preceding paper (Part I), a generalised system of equations was proposed to represent multi-D flows of particle-fluid mixtures. It was based on a coupling of two sets of equations, one for each phase: the Lundgren hierarchy for the continuous phase and an adaptation of the well-known B.B.G.K.Y.[...]
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Archives of Mechanics
EN This paper concerns the mathematical and numerical modelling of thermal phenomena and phase transformations in the solid state accompanying laser heating processes. Thermal phenomena with the motion of a liquid metal in the fusion zone are analyzed on the basis of numerical solution of equations for[...]
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