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Tytuł:
Mass transfer analysis of two-phase flow in a suspension of microorganisms
Autorzy:
Mamatha, S.U.
Ramesh, Babu, K.
Durga Prasad, Putta
Raju, C.S.K.
Varma, S.V.K.
Powiązania:
https://bibliotekanauki.pl/articles/240799.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gyrotactic microorganisms
dusty fluid
mass transfer
stretching sheet
bio convection
boundary layer flow
Opis:
The aim of present work is to investigate the mass transfer of steady incompressible hydromagnetic fluid near the stagnation point with deferment of dust particles over a stretching surface. Most researchers tried to improve the mass transfer by inclusion of cross-diffusion or dust particles due to their vast applications in industrial processes, extrusion process, chemical processing, manufacturing of various types of liquid drinks and in various engineering treatments. To encourage the mass transport phenomena in this study we incorporated dust with microorganisms. Conservation of mass, momentum, concentration and density of microorganisms are used in relevant flow equations. The arising system of nonlinear partial differential equations is transformed into nonlinear ordinary differential equations. The numerical solutions are obtained by the Runge-Kutta based shooting technique and the local Sherwood number is computed for various values of the physical governing parameters (Lewis number, Peclet number, Eckert number). An important finding of present work is that larger values of these parameters encourage the mass transfer rate, and the motile organisms density profiles are augmented with the larger values of fluid particle interaction parameter with reference to bioconvection, bioconvection Lewis number, and dust particle concentration parameter..
Źródło:
Archives of Thermodynamics; 2020, 41, 1; 175-192
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrically conducting flow through exponential power law fluid with variable thermal conductivity
Autorzy:
Ferdows, M.
Bangalee, M. Z. I.
Liu, D.
Powiązania:
https://bibliotekanauki.pl/articles/265439.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
warstwa graniczna
podobieństwa
MHD
similarity solution
variable properties
boundary layer flow
exponential law
Opis:
The problem of exponential law of steady, incompressible fluid flow in boundary layer and heat transfer are studied in an electrically conducting fluid over a semi-infinite vertical plate assuming the variable thermal conductivity in the presence of a uniform magnetic field. The governing system of equations including the continuity equation, momentum equation and energy equation have been transformed into nonlinear coupled ordinary differential equations using appropriate similarity variables. All the numerical and graphical solutions are obtained through the use of Maple software. The solutions are found to be dependent on three dimensionless parameters including the magnetic field parameter M, thermal conductivity parameter and Prandtl number Pr. Representative velocity and temperature profiles are presented at various values of the governing parameters. The skin-friction coefficient and the rate of heat transfer are also calculated for different values of the parameters.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 539-548
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Outcome of nanofluid flow containing arbitrary shape nanoparticles induced by a permeable stretching sheet
Autorzy:
Sarkar, A.
Kundu, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/264501.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przenoszenie ciepła
nanociecze
promieniowanie cieplne
nanofluid
heat transfer
boundary layer flow
thermal radiation
permeable stretching sheet
Opis:
In this work we have discussed the impact of thermal radiation on heat transfer to nanofluid flow over an unsteady permeable stretching sheet using various types of arbitrary shape nanoparticles of Copper (Cu), Silver (Ag), Alumina [...], and Titania Oxide [...] in the base fluid. Suitable transformations have been employed to build ODEs from the partial differential equations. Numerical results are therefore obtained particularly for cylindrical shape and spherical shape nanoparticles. Our analysis substantiates that the velocity and temperature profiles increases with enhanced thermal radiation parameter. Further, Nusselt number is more advanced for the nanofluid that contains cylindrical shape nanoparticles as compared to spherical shape nanoparticles.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 142-156
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady laminar mixed convection boundary layer flow near a vertical wedge due to oscillations in the free-stream and surface temperature
Autorzy:
Roy, N. C.
Hossain, A.
Hussain, S.
Powiązania:
https://bibliotekanauki.pl/articles/264762.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja mieszana
granica przepływu warstwy
przepływ ciepła
mixed convection
boundary layer flow
vertical wedge
free-stream oscillation
Opis:
The unsteady laminar boundary layer characteristics of mixed convection flow past a vertical wedge have been investigated numerically. The free-stream velocity and surface temperature are assumed to be oscillating in the magnitude but not in the direction of the oncoming flow velocity. The governing equations have been solved by two distinct methods, namely, the straightforward finite difference method for the entire frequency range, and the extended series solution for low frequency range and the asymptotic series expansion method for high frequency range. The results demonstrate the effects of the Richardson number, Ri, introduced to quantify the influence of mixed convection and the Prandtl number, Pr, on the amplitudes and phase angles of the skin friction and heat transfer. In addition, the effects of these parameters are examined in terms of the transient skin friction and heat transfer.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 169-186
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flow and heat transfer at a nonlinearly shrinking porous sheet: the case of asymptotically large powerlaw shrinking rates
Autorzy:
Prasad, K. V.
Vajravelu, K.
Pop, I.
Powiązania:
https://bibliotekanauki.pl/articles/265012.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
warstwa graniczna przepływu
metoda Keller-Box
przenikanie ciepła
boundary layer flow
porous shrinking sheet
Keller-box method
similarity solutions
heat transfer
Opis:
The boundary layer flow and heat transfer of a viscous fluid over a nonlinear permeable shrinking sheet in a thermally stratified environment is considered. The sheet is assumed to shrink in its own plane with an arbitrary power-law velocity proportional to the distance from the stagnation point. The governing differential equations are first transformed into ordinary differential equations by introducing a new similarity transformation. This is different from the transform commonly used in the literature in that it permits numerical solutions even for asymptotically large values of the power-law index, m. The coupled non-linear boundary value problem is solved numerically by an implicit finite difference scheme known as the Keller- Box method. Numerical computations are performed for a wide variety of power-law parameters (1 < m < 100,000) so as to capture the effects of the thermally stratified environment on the velocity and temperature fields. The numerical solutions are presented through a number of graphs and tables. Numerical results for the skin-friction coefficient and the Nusselt number are tabulated for various values of the pertinent parameters.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 779-791
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mixed convection in the stagnation-point flow over a vertical stretching sheet in the presence of thermal radiation
Autorzy:
Manjunatha, S.
Gireesha, B. J.
Bagewadi, C. S.
Powiązania:
https://bibliotekanauki.pl/articles/265508.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
boundary layer flow
stretching porous surface
mixed convective parameter
thermal radiation
numerical solution
dusty fluid
free stream velocity
przepływ warstwowy
powierzchnia porowata
promieniowanie cieplne
Opis:
An unsteady two-dimensional stagnation-point mixed convection flow of a viscous, incompressible dusty fluid towards a vertical stretching sheet has been examined. The stretching velocity and the free stream velocity are assumed to vary linearly with the distance from the stagnation point. The problem is analyzed using similarity solutions. The similarity ordinary differential equations were then solved numerical by using the RKF-45 method. The effects of various physical parameters on the velocity profile and skin-friction coefficient are also discussed in this paper. Some important findings reported in this work reveal that the effect of radiation has a significant impact on controlling the rate of heat transfer in the boundary layer region.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 871-888
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat transfer of viscoelastic fluid flow due to nonlinear stretching sheet with internal heat source
Autorzy:
Nandeppanavar, M. M.
Siddalingappa, M. N.
Jyoti, H.
Powiązania:
https://bibliotekanauki.pl/articles/265070.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
płyn lepkosprężysty
warstwa graniczna przepływu
rozciąganie
źródło ciepła
przenikanie ciepła
viscoelastic fluid
boundary layer flow
exponential stretching sheet
heat source/sink
heat transfer
skin friction
Opis:
In the present paper, a viscoelastic boundary layer flow and heat transfer over an exponentially stretching continuous sheet in the presence of a heat source/sink has been examined. Loss of energy due to viscous dissipation of the non-Newtonian fluid has been taken into account in this study. Approximate analytical local similar solutions of the highly non-linear momentum equation are obtained for velocity distribution by transforming the equation into Riccati-type and then solving this sequentially. Accuracy of the zero-order analytical solutions for the stream function and velocity are verified by numerical solutions obtained by employing the Runge-Kutta fourth order method involving shooting. Similarity solutions of the temperature equation for non-isothermal boundary conditions are obtained in the form of confluent hypergeometric functions. The effect of various physical parameters on the local skin-friction coefficient and heat transfer characteristics are discussed in detail. It is seen that the rate of heat transfer from the stretching sheet to the fluid can be controlled by suitably choosing the values of the Prandtl number Pr and local Eckert number E, local viscioelastic parameter k1 and local heat source/ sink parameter β.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 739-760
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical predictions of laminar flow and free convection heat transfer from an isothermal vertical flat plate
Autorzy:
Belhocine, Ali
Stojanovic, Nadica
Abdullah, Oday Ibraheem
Powiązania:
https://bibliotekanauki.pl/articles/27309866.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
free convective flow
vertical flat plate
similarity solution
boundary layer flow
dimensionless temperature
Prandtl number
Runge-Kutta method
swobodny przepływ konwekcyjny
rozwiązanie podobieństwa
przepływ warstwy granicznej
bezwymiarowa temperatura
numer Prandtla
Metoda Runge-Kutty
Opis:
In this present work, the laminar free convection boundary layer flow of a two-dimensional fluid over the vertical flat plate with a uniform surface temperature has been numerically investigated in detail by the similarity solution method. The velocity and temperature profiles were considered similar to all values and their variations are as a function of distance from the leading edge measured along with the plate. By taking into account this thermal boundary condition, the system of governing partial differential equations is reduced to a system of non-linear ordinary differential equations. The latter was solved numerically using the Runge-Kutta method of the fourth-order, the solution of which was obtained by using the FORTRAN code on a computer. The numerical analysis resulting from this simulation allows us to derive some prescribed values of various material parameters involved in the problem to which several important results were discussed in depth such as velocity, temperature, and rate of heat transfer. The definitive comparison between the two numerical models showed us an excellent agreement concerning the order of precision of the simulation. Finally, we compared our numerical results with a certain model already treated, which is in the specialized literature.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 4; 749--773
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-dimensional and dynamic method of visualization of the flow characteristics in a convection boundary layer using infrared thermography
Autorzy:
Patorski, J. A.
Bauer, G. S.
Dementjev, S.
Powiązania:
https://bibliotekanauki.pl/articles/279681.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
IR-thermography measurement
visualization of internal flow within convection boundary layer
heat transfer visualization
Opis:
The paper presents a two-dimensional and dynamic (2DD) method of using infrared thermography (IRT) for visualization of the cooling efficiency of a heated wall, as this method was applied in an experimental investigation. The 2DD method allows the outer surface temperature measured by an IRT device to be worked out relative to the bulk coolant-fluid temperature. This way the 2DD method makes visible the qualitative and quantitative flow characteristics within the thin contact layer at the inner surface of the wall. These flow characteristics, and more specifically, the pattern of the flow (similar to streamlines useful for the detection of dead zones) and the distribution of the temperature differences between the temperature on the wall outer surface and the bulk temperature of the coolant, determine the cooling efficiency. Finally, animated IR thermogram sequences could be generated, allowing observation of the spatial and temporal behavior of the flow/cooling behind the wall, for an example see animations in internet page (Patorski, 2000). The study of the cooling of the proton beam entry window described in this paper is a part of the development program of neutron spallation sources with liquid metal targets. The basic idea of the experiments was to use the real interacting materials (mercury as the liquid metal and steel as the window wall) and observe the cooling effects of the mercury flow on the heated wall of the hemispherical shell of the mockup window. Different geometrical configurations of the inner flow guide tubes of the flow and different pumping velocities were examined in view of finding the optimal cooling solution.
Dwuwymiarowa dynamiczna metoda wizualizacji charakterystycznych właściwości przepływu w konwekcyjnej warstwie granicznej przy użyciu termowizji. Artykuł przedstawia, na przykładzie zastosowania w badaniach doświadczalnych, dwuwymiarową dynamiczną (2DD) metodę użycia termowizji (IRT) wizualizującą efektywność chłodzenia przepływem cieczy silnie ogrzewanej ścianki zbiornika. Wykorzystanie zsynchronizowanych pomiarów: temperatury zewnętrznej powierzchni ścianki zbiornika (za pomocą IRT) oraz temperatury masy płynącej cieczy (za pomocą termoelementów (TC)), pozwoliło na wizualizację jakościowych i ilościowych zjawisk przepływu cieczy charakteryzujących efektywność chłodzenia ścianki. Do zjawisk jakościowych zaliczono tu wizualizację obrazów przepływu; w przybliżeniu obrazów lini przepływu w pobliżu ścianki, ponieważ pola temperatur w dominującym stopniu zależą od rozkładu prędkości przepływu. Obrazy takie dają możliwość wykrycia zawirowań czy tzw. "marwych" stref przepływu występujących po niewidocznej stronie nieprzeźroczystej ścianki. Do zjawisk ilościowych zaliczono wizualizację pola rozkładu wartości różnicy temperatur pomiędzy ścianką a masą płynącej cieczy; mniejsze wartości tej różnicy wskazują lepszą lokalną efektywność chłodzenia. Wartość tej różnicy temperatur może być bezpośrednio skorelowana z konwekcyjnym współczynnikiem przekazywania ciepła. Pokazanie animacji w postaci sekwencji tak specyficznie zdefiniowanych pól temperatur pozwala na geometryczno-czasową (dynamiczną) ocenę efektywności chłodzenia ścianki zbiornika dla różnych konfiguracji wewnętrznego przepływu cieczy. Dla przykładu, na stronie internetu (Patorski,2000) pokazano dwie animacje dotyczące eksperymentów omawianych w artykule. Przedstawione badania doświadczalne służą wyborowi optymalnej konfiguracji przepływu rtęci dla chłodzenia ścianki stalowego zbiornika źródła neutronów, tzw. "okna" wejścia wiązki protonów, podczas wytwarzania neutronów z jąder atomów ciężkich metali w procesie spallacji. W omawianym przypadku rtęć będzie jednocześnie wykorzystywana do wytwarzania neutronów, jak i do chłodzenia stalowej ścianki naczynia źródła neutronów. Z punktu widzenia analizy naprężeń termo-mechanicznych w ściance "okna" zbiornika źródła neutronów było koniecznym doświadczalne zbadanie charakterystyki konwekcyjnego przekazywania ciepła z użyciem przewidywanych do zastosowania materiałów (stal i rtęć), z zastosowaniem realnych kształtów i wymiarów zbiornika źródła neutronów (cylinder zakończony półkulą) oraz wewnętrznych geometrycznych i hydraulicznych warunków przepływu rtęci.
Źródło:
Journal of Theoretical and Applied Mechanics; 2001, 39, 2; 353-376
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the turbulent boundary layer of a dry granular avalanche down an incline. II – closure model and numerical simulations
Autorzy:
Fang, C.
Powiązania:
https://bibliotekanauki.pl/articles/279373.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
closure model
gravity-driven flow
passive layer
turbulent boundary layer
Opis:
Dynamic responses of the closure relations, specific turbulent Helmholtz free energy and turbulent viscosity are postulated followed by experimental calibrations. The established closure model is applied to analyses of a gravity-driven stationary avalanche with incompressible grains down an incline. While the mean velocity and volume fraction increase from their minimum values on the plane toward maximum values on the free surface exponentially, two-fold turbulent kinetic energies and dissipations evolve in a reverse manner. Most two-fold turbulent kinetic energies and dissipations are confined within the thin turbulent boundary layer immediately above the plane, with nearly vanishing two-fold turbulent kinetic energies and finite two-fold turbulent dissipations in the passive layer. The two layers are similar to those of Newtonian fluids in turbulent boundary layer flows, and are preferable recognized by the distributions of turbulent kinetic energies and dissipations.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1245-1256
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LES of converging-diverging channel flow with separation
Autorzy:
Kuban, L.
Elsner, W.
Tyliszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1943209.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska
Tematy:
LES
turbulent boundary layer
separation
channel flow
pressure gradient
Opis:
The paper presents the results of LES simulation of two different turbulent channels with inlet conditions corresponding to the Reynolds number Re =395. In both cases a varying pressure gradient was obtained by an adequate curvature of one of the walls. The first case is treated as a benchmark and is used to validate the numerical procedure. This case is characterized by the same cross-section area at the inlet and outlet and a bump of a smooth profile located on one of the walls designed to be identical to the one used in the experiment conducted at Laboratorie de Mecanique de Lille (LML) (Marquillie et al., 2008). The second case corresponds to the geometry which reproduces the real geometry of the turbomachinery test section of the Czestochowa University of Technology. The test section was created in such a way as to produce the pressure gradient which would correspond to the conditions present in the axial compressor blade channel. The shape of both channels produced initially favorable (FPG) and then adverse pressure gradients (APG), and in this way created conditions for boundary layer separation. Due to a reverse flow where the turbulence transport is dictated by the dynamics of the large-scale eddies such a case is well suited to demonstrate predictive features of the LES technique.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 3; 283-295
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PIV measurements of flow separation over laminar airfoil at transonic speeds
Autorzy:
Stryczniewicz, W.
Placek, R.
Szczepaniak, R.
Powiązania:
https://bibliotekanauki.pl/articles/247542.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
shock wave
transonic flow
boundary layer separation
Particle Image Velocimetry
Opis:
The paper presents results of transonic flow field visualization over a laminar airfoil in high-speed wind tunnel. Quite recently, considerable attention has been paid to experimental investigations of an interaction between the shock and the boundary layer for aerodynamics applications. The purpose of the paper is to investigate development of the flow separation over laminar airfoil at transonic speeds. In a course of presented studies, the Particle Image Velocimetry (PIV) method was used for instantaneous velocity measurements of flow field in the test section of N-3 Institute of Aviation transonic wind tunnel. The object of the research was a laminar airfoil inclined at various angles. The effect of the varying angle of incidence on the flow filed was investigated. The freestream Mach number was 0.7. The results of the PIV measurements were analysed in order to identify the type of the separation from the measured velocity fields. Three forms of separation for low, medium and high angle of incidence was distinguished. The results are in good agreement with theoretical models reported in the literature. The study showed that application of quantitative flow visualisation technique allowed gaining new insights on the complex phenomenon of transonic flow over airfoil. The results of the presented research can be used for better understanding of the mechanism of the flow separation process in transonic flow over airfoils and fluid structure interactions.
Źródło:
Journal of KONES; 2016, 23, 1; 329-335
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of separation and methods of three-dimensional flow structure detection in the boundary layer shock wave interaction
Autorzy:
Czerwińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1954539.pdf
Data publikacji:
1999
Wydawca:
Politechnika Gdańska
Tematy:
shock wave boundary layer interaction
flow separation
3D flow structures
numerical simulations
Opis:
The normal shock wave turbulent boundary layer interaction still draws a great deal of attention as a flow phenomenon. This is due to its profound importance to numerous applications. The understanding of phenomena is crucial for future aims connected with the interaction control. Experimental investigations of the interaction have been carried out since the 1940s. They were aimed however at the determination of such general flow features as: pressure distribution, shock wave configuration or oil visualization of separation structures. In order to better understand the phenomenon, measurements of the entire field are required. At present, such measurements do not exist. A great help is expected from numerical simulations in this respect. There is enough experimental data to check the general features of the flow obtained from calculations. This thesis presents numerical simulations of flow that is assumed: steady, three-dimensional, compressible, viscous and turbulent. Its general aim is to present to what extend the modern numerical methods are able to predict the flow in shock wave turbulent boundary layer interaction including shock induced separation structures. These structures are very sensitive to channel geometry and may be useful in the understanding of separation's development. In order to illustrate the abilities of numerical simulations, one aim of the presented thesis is to investigate the effect of the span-wise depth of the nominally two-dimensional test section. The presented results cast some light on the common problems experienced by typical comparisons of two-dimensional simulations to wind tunnel tests having a three-dimensional nature. The first Chapter presents the basic theory of elementary structures. Considerations of elementary structures of the flow along with their dependencies are necessary for a better understanding of the separation flow structures induced by the boundary layer shock wave interaction. The classification of elementary structures will be presented. In addition, the possible occurrence of bifurcation will also be studied. The second Chapter will be devoted to studying specific cases of transonic turbulent flow. The analysis of numerical results will be bounded to the shock wave structure. Studies shall include: the influence of the numerical scheme, three-dimensional effects connected with the changing width of the channel, a comparison to experiment and the influence of the symmetric boundary condition on the flow prediction in the channel. Finally, the boundary layer influence on the 1-foot structure will also be presented. Chapter three will present the separation structures. Here too a comparison to experiments will be done. Changes in separation structures connected with the width of the channel will be studied. The influence of the symmetry boundary condition will be shown. Finally, the specification of the basic flow structures will be done.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 1; 53-140
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of the boundary layer shock wave interaction type in transonic flow regime
Autorzy:
Placek, R.
Stryczniewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/242396.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transonic flow
wind tunnel techniques
shock wave
airfoil
boundary layer interaction
Opis:
The paper presents various approaches to wind tunnel data analysis when identifying the shock wave boundary layer interaction type. The investigation was carried out in the transonic flow regime in the N-3 Wind Tunnel of Institute of Aviation. The Mach number was 0.7 and Reynolds number was approximate equal 2.85 million. The object of the research was a laminar airfoil in configuration without and with turbuliser device mounted on the upper model surface. In order to achieve turbulent boundary layer in front of the shock wave the carborundum strip was used. The effect of the varying angle of incidence on the flow filed was investigated. During experimental research, different means and test methods were applied (pressure measurements, Schlieren and oil visualisation, Particle Image Velocimetry (PIV), hot-film anemometry). The results were analysed in terms of the shock wave boundary interaction type. Most of results were in good agreement with theoretical models reported in the literature. The study showed that combination of various measurement techniques should be used in the shock wave boundary investigations in order to achieve more consistent and reliable conclusions. The results of the presented research can also be used for better understanding other mechanisms i.e. the boundary layer shock wave separation process in transonic flow regime.
Źródło:
Journal of KONES; 2016, 23, 2; 285-292
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wavelet-based numerical solution for MHD boundary-layer flow due to stretching sheet
Autorzy:
Karkera, Harinakshi
Katagi, Nagaraj N.
Powiązania:
https://bibliotekanauki.pl/articles/2106444.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
przepływ
linearyzacja
MHD flow
boundary layer
quasi-linearization
Haar wavelets
Opis:
In this paper, a two-dimensional steady flow of a viscous fluid due to a stretching sheet in the presence of a magnetic field is considered. We proposed two new numerical schemes based on the Haar wavelet coupled with a collocation approach and quasi-linearization process for solving the Falkner-Skan equation representing the governing problem. The important derived quantities representing the fluid velocity and wall shear stress for various values of flow parameters Mand βare calculated. The proposed methods enable us to obtain the solutions even for negative β, nonlinear stretching parameter, and smaller values of the magnetic parameter ()M1< which was missing in the earlier findings. Numerical and graphical results obtained show an excellent agreement with the available findings and demonstrate the efficiency and accuracy of the developed schemes. Another significant advantage of the present method is that it does not depends on small parameters and initial presumptions unlike in traditional semi-analytical and numerical methods.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 84--103
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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