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Journal of Theoretical and Applied Mechanics
2007 Vol. 45 nr 3 489-503
PL W pracy przedstawiono analizę turbulentnego przepływu wody przez mikro-kanał emulsyfikatora. Wyniki uzyskane eksperymentalną techniką Cyfrowej Anemometrii Obrazowej (PIV - Particle Image Velocimetry) zaadoptowanej do pomiarów w mikroskali (micro-PIV) porównano z wynikami symulacji numerycznych przep[...]
EN Turbulent flow of water in a short 0.4 mm high micro-channel of an emulsifier is investigated experimentally using a micro-PIV technique and compared with numerical predictions. The micro-flow measurements are based on epi-fluorescence illumination and high-speed imaging. Velocity fields obtained fr[...]
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Journal of Theoretical and Applied Mechanics
2007 Vol. 45 nr 3 505-511
PL W pracy przedstawiono wyniki badań eksperymentalnych współczynników przejmowania ciepła na kuli przy różnych stopniach turbulencji napływającej strugi. Średni współczynnik przejmowania ciepła na powierzchni kuli jest zależny od stopnia turbulencji przepływu wokół kuli. Jest to rezultat zmiany strukt[...]
EN In the paper, results of an experimental investigation of a heat transfer coefficient on a sphere for different inflow turbulence levels have been presented. The average heat transfer coefficient on the sphere surface appear to be dependent on the turbulence level of flow around the sphere. This eff[...]
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Modelowanie Inżynierskie
PL W pracy rozważono statystyczny opis przepływów turbulentnych przy wykorzystaniu metody funkcji gęstości rozkładu prawdopodobieństwa charakterystyk przepływu. W szczególności otrzymano równanie ewolucyjne dla jednopunktowej funkcji gęstości prawdopodobieństwa pulsacji koncentracji dyfundującej substa[...]
EN In the paper the use of probabiiity density functions metod to the statistical description of turbulent flows is considered. This formulation is less generał than the characteristic functionals approach, but primary in the relation to the Friedmann-Keller hierarchy equations. An evolution equation f[...]
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
2012 nr 141 7-14
EN A bypass transition model has been implemented in the FlowER solver. The model is based on the Shear Stress Transport turbulence model and Low-Reynolds transition model with the kinetic energy production limiter. The modifications of transition model are implemented to enable fully turbulent flow be[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN The work presents an application of Large-Eddy Simulation (LES) for turbulent two-phase flows with dispersed particles. For the simulations of the continuous phase (fluid), an academic, finite volume LES solver was applied and customised. For comparison purposes, also a spectral solver was considere[...]
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Physicochemical Problems of Mineral Processing
EN In the coarse particle flotation, turbulence which can be treated as energy dissipation rate, is one of the most significant parameters effecting the recovery and grade. Therefore, determination of energy dissipation rate is very beneficial for delineation of coarse particle flotation and determinin[...]
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Advances in Science and Technology Research Journal
EN The paper provides a discussion of the influence of turbulence in the areaa of high urban buildings or in vicinity of fire on safety of helicopter flights. The analysis was conducted using Ansys Fluent software. All the threats considering helicopter flight, landing and hovering in such an environme[...]
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Journal of Theoretical and Applied Mechanics
1998 nr 1 31-46
PL W pracy przedstawiono alternatywny sposób wyprowadzenia równania kinetycznego dla cząstek w turbulentnym przepływie dwufazowym. Wykorzystano metody rozwinięte w ramach teorii stochastycznych równań różniczkowych. Przedstawiono je w zarysie, łącznie z rozwinięciem liniowych i nieliniowych równań stoc[...]
EN An alternative way to obtain the kinetic equation for dispersed particles in turbulent flows is presented. The method uses some tools developed within the theory of the stochastic differential equations. They are presented first in an outline, including the cumulant expansion of linear stochastic eq[...]
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Journal of Theoretical and Applied Mechanics
1999 nr 1 3-11
PL Omówiono zastosowanie metody funkcji gęstości prawdopodobieństwa (PDF) do modelowania turbulencji, wraz z przykładami własnych obliczeń dla swobodnego przepływu ścinającego (strefa mieszania) i przepływu w prostej geometrii w obecności ścianek (kanał płaski). Wyszczególniono elementy algorytmu metod[...]
EN Application of the PFD method to turbulence modelling is surveyed. Important parts of the algorithm and of variance reduction techniques used therein are described. The computation results for a free-shear flow (mixing layer) and a wall-bounded flow in simple geometry (channel flow) are reported and[...]
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Optica Applicata
EN The paper presents theoretical foundations and results of experimental verification of the possibility of laser beam application for registration of air density fluctuations caused either by mechanically forced air flow near obstacles which are not streamlined or by the presence of solid objects whi[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN The paper presents a new extension of the -Ret model to account for both the laminar-turbulent transition and the surface roughness. The new modeling approach takes into account the pressure gradient, turbulence intensity and roughness height and density. In the transition region both the intermitt[...]
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Oceanologia
2008 No. 50 (2) 167-182
EN The space-time dynamics of chlorophyll a concentration and seawater excess viscosity has been investigated in the hydrographically contrasting inshore and offshore water masses of the eastern English Channel. This was done during the phytoplankton spring bloom dominated by Phaeocystis globosa before[...]
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Acta Geophysica
EN The paper addresses the problem of the resistance due to vegetation in an open channel flow, characterized by partially and fully submerged vegetation formed by colonies of bushes. The flow is characterized by significant spatial variations of velocity between vertical profiles that make the traditi[...]
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Acta Geophysica
EN Two approaches for the modelling of turbulence in vegetated flows have been developed in the past. The “microscopic” approach which is straightforward but limited to simple cases and the “macroscopic” approach which is based on Volume Average Theory (VAT). In this study, aspects of Volume-Average (V[...]
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Inżynieria i Aparatura Chemiczna
2009 Nr 1 108-109
PL Na podstawie pomiarów wykonanych przy użyciu anemometru laserowego w mieszalniku z samozasysającym mieszadłem tarczowym wykonano obliczenia wielkości skal długości, czasu i prędkości dla wirów z zakresu Kolmogurtncu, Taylora i Brodkcy'a.
EN Based on measurements carried out using a laser anemometer in an agitator with a self-aspirating impeller the calculations of'length. time and velocity scales for eddies in the Kolmtigorov, Taylor and Brodkey range were made.
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Oceanologia
EN Observations of the shelf environment rarely associate internal solitary waves (ISWs) with the impact of their passage. An experiment observed during the Coastal Mixing and Optics 1996 (CMO '96), a sequence of long internal waves on a coastal shelf is reported, including both mode-1 and mode-2 waves[...]
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Journal of KONES
EN The results of research into the velocity field in combustion chamber of piston engine are presented in the paper. The measurements of charge flow velocity in the cylinder axis and near the cylinder squeezing surface in several points were performed. The measurement results were used for analysis of[...]
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Transactions of the Institute of Fluid-Flow Machinery
2002 nr 110 103-114
EN The paper presents contemporary development in the field of deterministic description of turbulence with a special reference to Large Eddy Simulation (LES) methods. The limitations of conventional turbulence modelling based on stochastic methodology have been discussed and reasons for the developmen[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
2002 Vol. 6, No 2 309-321
EN Spreading of gaseous pollutants in windy atmosphere is considered by means of numerical simulations of two-dimensional hydrodynamic equations. The parametric studies, which are performed for various magnitudes of a horizontal wind speed, reveal a plume development and a generation of vortices which [...]
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Acta Geophysica Polonica
EN It is known that the invariance of a physical system subject to some groups of transformation may provide important information about dynamics of the system. This report deals with one of such invariances, namely the scaling invariance and its generalization - scale-similarity, which in the last few[...]
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