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Wyszukujesz frazę "velocity field" wg kryterium: Temat


Tytuł:
Velocity Field Characteristics at the Inlet to a Pipe Culvert
Autorzy:
Kolerski, T.
Wielgat, P.
Powiązania:
https://bibliotekanauki.pl/articles/241162.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
Culvert
Acoustic Doppler Velocitymeter
velocity field
turbulence
Opis:
A poorly designed culvert inlet structure causes scouring, which can lead to the collapse of the culvert and significant damage to the neighboring land. A set of laboratory tests was evaluated to examine velocity distribution at the culvert inlet. A three-dimensional acoustic Doppler velocimeter was used to measure instantaneous flow velocity upstream of the culvert. The analysis of mean velocities, turbulence strength, and Reynolds stresses was performed to understand the flow structure near the culvert entrance.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2014, 61, 3-4; 127--140
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of the Polymer Melt Velocity and Temperature in the Spinneret Channel of Bi-component Fibre Melt Spinning: a Mathematical Model
Autorzy:
Feng, Pei
Liu, Dashuang
Zhang, Ronggen
Yang, Chongchang
Powiązania:
https://bibliotekanauki.pl/articles/2056290.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
composite fibre
spinning assembly
velocity field distribution
mathematical model
Opis:
For the stability of composite fibre spinning, the difference in and distribution of the polymer melt velocity during the spinning are among the factors of importance. Based on the basic equation for the control of composite spinning dynamics, boundary conditions are identified and reported in this paper. A mathematical model for the symmetric and asymmetric distribution of the melt flow velocity in the microhole of the spinneret of the composite spinning assembly was developed. The accuracy of the mathematical model was also ascertained. It gives a theoretical basis for the designing of a composite spinning assembly.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 6 (150); 49--53
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing velocity estimations from permanent time series and CEGRN epoch campaigns
Autorzy:
Stangl, G.
Aichhorn, C.
Krauss, S.
Powiązania:
https://bibliotekanauki.pl/articles/225086.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
pole prędkości
Europa Środkowa
CERGOP
velocity field
Central Europe
Źródło:
Reports on Geodesy; 2008, z. 1/84; 23-29
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some exact solutions for Oldroyd-B fluid due to time dependent prescribed shear stress
Wybrane rozwiązania dokładne dla cieczy Oldroyda-B przy zadanej funkcji naprężeń stycznych zależnej od czasu
Autorzy:
Jamil, M.
Fetecau, C.
Rana, M.
Powiązania:
https://bibliotekanauki.pl/articles/280504.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Oldroyd-B fluid
velocity field
time-dependent shear stress
Hankel transform
Opis:
The velocity field and the shear stress corresponding to motion of an Oldroyd-B fluid between two infinite coaxial circular cylinders are established by means of the Hankel transforms. The flow of the fluid is produced due to the time dependent axial shear stress applied on the boundary of the inner cylinder. The exact solutions, presented under a series form, can easily be specialized to give similar solutions for the Maxwell, second grade and Newtonian fluids performing the same motion. Finally, some characteristics of the motion as well as the influence of the material constants on the behavior of the fluid are underlined by graphical illustrations.
Pole prędkości i pole rozkładu naprężeń stycznych wywołanych ruchem cieczy Oldroyda-B umieszczonej między dwoma koncentrycznymi cylindrami wyznaczono za pomocą transformaty Hankela. Przepływ cieczy wywołano zależnym od czasu naprężeniem stycznym od zewnętrznej ściany cylindra wewnętrznego. Uzyskane rozwiązanie dokładne, ujęte w formie rozwinięcia w szereg, może łatwo być zastosowane dla przypadków szczególnych cieczy Maxwella, cieczy drugiego stopnia i nienewtonowskich przy tych samych warunkach przepływu. Na zakończenie rozważań, przedstawiono graficznie charakterystyki ruchu cieczy i wpływ parametrów materiałowych na jej zachowanie.
Źródło:
Journal of Theoretical and Applied Mechanics; 2012, 50, 2; 549-562
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some problems of liquid flow in porous media
Zagadnienia przepływu cieczy w ośrodku porowatym
Autorzy:
Skawiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/281350.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlinearity of flow in porous media
velocity field in pore space
Opis:
In the paper theoretical considerations and results of experimental investigations into a liquid flow in porous media are presented. Since the first experiments with such a flow, made by Darcy in 1856, much research work in this field has been done. The flow of liquid in a porous medium is essentially nonlinear (with the permeability depending on flow velocity). The autor reviews the research into this nonlinearity and experimental investigations into a liquid flow in a pore space made in the last 125 years and reports on the experimental investigations into the velocity field in a pore space carried out at the Strata Mechanics Research Institute in Cracow.
W publikacji przedstawione są rozważania i wyniki eksperymentalnych badań przepływu cieczy w ośrodkach porowatych. Od pierwszych eksperymentów H. Darcy'ego w 1856 r. Wykonane było wiele prac badawczych tego zagadnienia. Najważniejsze z tych prac są cytowane i omówione w niniejszym artykule. Wynikiem tych prac jest stwierdzenie, że przypływ cieczy w ośrodkach porowatych jest z natury nieliniowy, to znaczy przepuszczalność w tym przepływie jest zależna od prędkości przepływu. Hydrodynamiczne przyczyny tej nieliniowości, czyli znaczący udział sił bezwładności w tym przepływie prowadzący do zmian pola prędkości w przestrzeni porowej, omówiony jest w niniejszej publikacji na podstawie badań eksperymentalnych, przede wszystkim wykonanych w Instytucie Mechaniki Górotworu w Krakowie. W końcowych komentarzach w publikacji zestawione są fakty i poglądy dotyczące przyczyn zmian przepuszczalności w przepływach wody w naturalnych ośrodkach porowatych, czyli w skałach, przede wszystkim w skałach osadowych.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 3; 703-722
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interpolating a velocity field using multilevel B-splines
Autorzy:
Nuckelt, A.
Powiązania:
https://bibliotekanauki.pl/articles/224604.pdf
Data publikacji:
2007
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
B-spline
pole prędkości
system pomiarowy
interpolacja
interpolating
velocity field
measuring systems
Opis:
The estimation of regular velocity fields irregular distributed GPS stations corresponds to the problem of scattered data approximation with free from surfaces. The method of Multilevel B-spline Approximation is a powerful tool to solve this problem. The iterative evaluation of approximation surfaces leads to a best fit approximation of the station velocities. The algorithm for the Multilevel B-spline Approximation has to be extended by the methods of error propagation to evaluate statistically the quality of the interpolated velocity field. Multilevel B-spline Approximation is applied to generate a velocity field based on roughly 50 GPS stations in Romania. The investigation area includes several CEGRN stations, campaign stations in the framework of the COLLABORATIVE RESEARCH CENTER 461 "STRONG EARTHQUAKES" and a few permanent GPS stations. The application of the law of error propagation provides an opportunity to analyse the accuracy of the velocity field.
Źródło:
Reports on Geodesy; 2007, z. 2/83; 55-64
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geo-kinematics of Central Europe inferred from long-term monitored regional and local GPS networks
Autorzy:
Hefty, J.
Powiązania:
https://bibliotekanauki.pl/articles/225133.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
Europa Środkowa
sieci GPS
pole prędkości
geokinematyka
Central Europe
GPS networks
velocity field
geokinematics
Źródło:
Reports on Geodesy; 2008, z. 2/85; 9-18
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter identification of the basset force acting on particles in fluid flow induced by the oscillating wall
Autorzy:
Pavlenko, Ivan
Liaposhchenko, Oleksandr
Pitel, Jan
Sklabinskyi, Vsevolod
Powiązania:
https://bibliotekanauki.pl/articles/123004.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
hydrodynamics
vibration impact
velocity field
complementary functions
regression analysis
infinite power series
analiza regresji
hydrodynamika
wibracje
przepływ dwufazowy
Opis:
The article is aimed at the development of the analytical approach for evaluating the parameters of the Basset force acting on a particle in two-dimensional fluid flow induced by the oscillating wall. By applying regression analysis, analytical expressions to determine complementary functions were established for evaluating the Basset force. The obtained dependencies were generalized using the infinite power series. As a result of studying the hydrodynamics of a two-phase flow, analytical dependencies to determine the Basset force were proposed for assessing its impact on particles of the dispersed phase in a plane channel with the oscillating wall. It was discovered that the Basset force affects larger particles. However, in the case of relatively large wavelengths, its averaged value for the vibration period is neglected. Additionally, the value of the Basset force was determined analytically for the case of relatively small wavelengths. Moreover, it was discovered that its impact can be increased by reducing the wavelength of the oscillating wall.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 2; 53-63
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the liquid flow in a vessel with a rotating disk at the liquid surface
Autorzy:
Suchecki, W.
Powiązania:
https://bibliotekanauki.pl/articles/184934.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
liquid flow
rotating disk
von Kármán’s equations
velocity field
digital particle image
velocimetry
przepływ cieczy
dysk obrotowy
równanie von Karmana
pole prędkości
Opis:
This study is concerned with liquid flow induced by a disk which rotates steadily around its axis and touches the free surface of liquid contained in a cylindrical vessel. It is a simplified model of the flow in the inlet part of a vertical cooling crystallizer where a rotary distributor of inflowing solution is situated above the free surface of solution contained in the crystalliser. Numerical simulations of flow phenomena were conducted and the simulation results were interpreted assuming an analogy with Kármán’s theoretical equations. In a cylindrical coordinate system, the components of flow velocity were identified as functions of distance from the surface of the rotating disk. The experimental setup was developed to measure velocity fields, using digital particle velocimetry and optical flow. Conclusions concerning the influence of disc rotation on liquid velocity fields were presented and the experimental results were found to confirm the results of numerical simulation. On the basis of simulation data, an approximation function was determined to describe the relationship between the circumferential component of flow velocity and the distance from the disk.
Źródło:
Chemical and Process Engineering; 2014, 35, 1; 3-18
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Simultaneous Occurrence of Logarithmic and S-Shaped Velocity Profiles in Gravel-Bed River Flows
Autorzy:
Franca, M. J.
Lemmin, U.
Powiązania:
https://bibliotekanauki.pl/articles/241179.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
field measurements
gravel-bed river flows
velocity profiles
Opis:
Based on Acoustic Doppler Velocity Profiler (ADVP) field measurements, we discuss velocity profiles observed in two shallow gravel-bed rivers with low relative submergence. In these flows, log-shaped profiles and s-shaped profiles simultaneously exist, indicating the possibility of 3D flow inside the roughness layer. A quasi-2D layer is generally found in an intermediate region of the flow above the roughness layer. Therefore a best-fit log-law approach may lead to estimates of a roughness parameter which are reasonably correlated with the local flow resistance. However, above a certain limit of the ratio roughness/water depth (∼0.6 from our measurements), the velocity distribution in the lower regions predominantly corresponds to an s-shaped profile.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2009, 56, 1-2; 29-41
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correction of Evanescent Wave Influence on the Flexural Wave Velocity and Wavelength Estimation Based on a Mode Shape Function
Autorzy:
Pantelić, Filip
Šumarac Pavlović, Dragana
Mijić, Miomir
Ridley-Ellis, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/31339954.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
mode shape function
flexural wave velocity
very near field
Opis:
The aim of this research is to use a simple acoustic method of a very near field recording, which enables measurement and display of oscillation modes, to estimate the velocity of flexural waves, based on the wavelengths of standing waves measured on the sample. The paper analyses cases of 1D geometry, flexural waves that occur on a beam excited by an impulse. Measurements were conducted on two different samples: steel and a wooden beam of the same length. Due to the appearance of evanescent waves at the boundary regions, the distance between the nodes of standing waves that occur deviates from half the wavelength, which can be compensated using a correction factor. Cases of fixed and free boundary conditions were analysed. By quantifying how much the boundary conditions change the mode shape function, it can be predicted how the mode of oscillation changes if the boundary conditions change, which can also find application in musical acoustics and sound radiation analysis.
Źródło:
Archives of Acoustics; 2022, 47, 4; 539-546
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of induced magnetic field on MHD mixed convection flow in vertical microchannel
Autorzy:
Jha, B. K.
Aina, B.
Powiązania:
https://bibliotekanauki.pl/articles/265764.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
microchannel
transverse magnetic field
induced magnetic field
velocity slip
temperature jump
pole magnetyczne
skok temperatury
mikrokanał
Opis:
The present work presents a theoretical investigation of an MHD mixed convection flow in a vertical microchannel formed by two electrically non-conducting infinite vertical parallel plates. The influence of an induced magnetic field arising due to motion of an electrically conducting fluid is taken into consideration. The governing equations of the motion are a set of simultaneous ordinary differential equations and their exact solutions in dimensionless form have been obtained for the velocity field, the induced magnetic field and the temperature field. The expressions for the induced current density and skin friction have also been obtained. The effects of various non-dimensional parameters such as rarefaction, fluid wall interaction, the Hartmann number and the magnetic Prandtl number on the velocity, the induced magnetic field, the temperature, the induced current density, and skin friction have been presented in a graphical form. It is found that the effect of the Hartmann number and magnetic Prandtl number on the induced current density is found to have a decreasing nature at the central region of the microchannel.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 567-582
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systematic error of acoustic particle image velocimetry and its correction
Autorzy:
Mickiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/221013.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
particle image velocimetry
acoustic measurement
acoustic particle velocity
sound field analysis
Opis:
Particle Image Velocimetry is getting more and more often the method of choice not only for visualization of turbulent mass flows in fluid mechanics, but also in linear and non-linear acoustics for non-intrusive visualization of acoustic particle velocity. Particle Image Velocimetry with low sampling rate (about 15Hz) can be applied to visualize the acoustic field using the acquisition synchronized to the excitation signal. Such phase-locked PIV technique is described and used in experiments presented in the paper. The main goal of research was to propose a model of PIV systematic error due to non-zero time interval between acquisitions of two images of the examined sound field seeded with tracer particles, what affects the measurement of complex acoustic signals. Usefulness of the presented model is confirmed experimentally. The correction procedure, based on the proposed model, applied to measurement data increases the accuracy of acoustic particle velocity field visualization and creates new possibilities in observation of sound fields excited with multi-tonal or band-limited noise signals.
Źródło:
Metrology and Measurement Systems; 2014, 21, 3; 447-460
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics simulations of the electrodynamic railgun different constructions and their measurement verification
Autorzy:
Piekielny, Paweł
Tomczuk, Bronisław
Waindok, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/27309948.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
3D field analysis
analysis of transients
analytical models
electrodynamic accelerator
experimental verification
field-circuit modeling
projectile velocity
Opis:
Dynamic characteristics for three types of railgun constructions were simulated and measured in this work. The simplest construction is the iron-less (IL) railgun, while the two other ones (IC and ICPM) have an iron-core. The iron-core permanent magnet (ICPM) railgun additionally has permanent magnets. To compare their characteristics, similar dimensions of the rails and iron cores were adopted, and the same power supply system was used. Numerical magnetic field analyses and our analytical models have been used to determine the electromagnetic parameters. They were verified experimentally. The transient states of the railguns were studied with our field-circuit mathematical model, and their results were also verified by experiments.
Źródło:
Archives of Electrical Engineering; 2023, 72, 4; 951--969
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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