Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "heat method" wg kryterium: Wszystkie pola

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 26
Tytuł:
Heat Flux Identification at the Charge Surface During Heating in Chamber Furnace
Autorzy:
Gołdasz, A.
Malinowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/351346.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat flux
inverse method
finite element method
chamber furnace
Opis:
In this study, a method of determining the heat flux, which reaches the surface of a charge, has been presented with the use of an inverse analysis. The research on the heating process of a square 15HM steel charge was conducted in a natural gas-fired laboratory furnace. The inverse solution was based on the search of the minimum standard error between the measured and the calculated temperatures. The temperature of the charge has been calculated by the finite element method, solving the heat conduction equation for a square charge heated on all the surfaces. As a result, the mean value of the heat flux on each of the heated surfaces of the charge was estimated.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2021-2026
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of heat diffusion in composites
Autorzy:
Bondyra, A.
Powiązania:
https://bibliotekanauki.pl/articles/243729.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
finite element method
glass reinforced composites
heat diffusion
fire
Opis:
Composites structures are widely using in varied fields of industry, where it has to take into account changes of temperature or it is possibility of fire hazards. Heat transfer and fire conditions in composites are very often analysis issues nowadays. A large amount of research in area of modelling heat transfer and fire loading of composites has been performed for both experimental studies and modelling and simulation. The most common areas of analysis of thermal composite structures are: multiscale modelling of heat transfer, simultaneous fire and mechanical loading, fire involved failure and temperature distribution under fire and elevated temperature conditions. This paper presents analysis of heat transfer in composites with taking into account their shape and thickness. The models include a convection mode of heat transfer. The first composite plate is 10 cm wide by 10 cm tall with a thickness of 1 cm. The modified structure has also second part, smaller plate on top 5 cm wide by 5 cm in right corner. They made of glass/vinylester composite. The plates are heating in one, two and three directions. The results are shown in forms of contours of temperature distribution and thermal gradient. Comparison of results for the modelled structures shows differences in the shape and thickness of the analysed structure.
Źródło:
Journal of KONES; 2013, 20, 3; 63-69
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of the Heat Transfer Coefficient at the Charge Surface Heated on the Chamber Furnace
Autorzy:
Gołdasz, A.
Malinowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/356595.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer coefficient
inverse method
finite element method
Opis:
The inverse method was applied to determine the heat flux reaching the charge surface. The inverse solution was based upon finding the minimum of the error norm between the measured and calculated temperatures. The charge temperature field was calculated with the finite element method by solving the heat transfer equation for a square charge made of 15HM steel heated on all its surfaces. On the basis of the mean value of heat flux, the value of the heat transfer coefficient at each surface was determined depending on the surface temperature of the material heated.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 509-513
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat conduction in TG laminate tolerance modeling and the finite element method
Autorzy:
Radzikowska, A.
Ostrowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/362621.pdf
Data publikacji:
2010
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
przewodzenie ciepła
funkcjonalne stopniowanie laminatu
tolerancyjne modelowanie
metoda elementów skończonych
heat conduction
functionally graded laminate
tolerance modelling
finite element method
Opis:
In this paper a problem of heat conduction in the laminate is investigated. The laminate is made of two conductors, non-periodically distributed as micro laminas along one direction. A macrostructure of such laminate is assumed to be functionally graded along this direction. In order to analyse the heat conduction, two modelling methods are applied: the tolerance averaging technique and the finite element method. The first approach is based on the book edited by Cz. Woźniak, Michalak and Jędrysiak [6], the second one is used in the numerical system ABAQUS. The results of applying both methods are compared for two different cases of the distribution of the conductors.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 3, 3; 49-52
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the finite element method to the determining of boiling heat transfer coefficient for minichannel flow
Autorzy:
Piasecka, M.
Maciejewska, B.
Powiązania:
https://bibliotekanauki.pl/articles/240586.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
incipience of flow boiling
finite element method
przepływ ciepła
przepływ wrzenia
metoda elementów skończonych
Opis:
Miniature heat exchangers are used to provide higher cooling capacity for new technologies. This means a reduction in their size and cost but the identical power. The paper presents the method for determination of boiling heat transfer coefficient for a rectangular minichannel of 0.1 mm depth, 40 mm width and 360 mm length with asymmetric heating. Experimental research has focused on the transition from single phase forced convection to nucleate boiling, i.e., the zone of boiling incipience. The ‘boiling front’ location has been determined from the temperature distribution of the heated wall obtained from liquid crystal thermography. The experiment has been carried out with R-123, mass flux 220 kg/(m2s), pressure at the channel inlet 340 kPa. Local values of heat transfer coefficient were calculated on the basis of empirical data from the experiment following the solution of the two-dimensional inverse heat transfer problem. This problem has been solved with the use of the finite element method in combination with Trefftz functions. Temperature approximates (linear combinations of Trefftz functions) strictly fulfill the governing equations. In presented method the inverse problem is solved in the same way as the direct problem. The results confirmed that considerable heat transfer enhancement takes place at boiling incipience in the minichannel flow boiling. Moreover, under subcooling boiling, local heat coefficients exhibit relatively low values.
Źródło:
Archives of Thermodynamics; 2013, 34, 1; 55-69
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of heat transfer on peristaltic flow in presence of heat generation against higher value of Reynolds number using FEM
Autorzy:
Javed, Tariq
Hamid, Abdul H.
Ahmed, Bilal
Ali, Nasir
Powiązania:
https://bibliotekanauki.pl/articles/1839717.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
finite element method
peristaltic flow
heat transfer
Opis:
In the present investigation, heat transfer analysis of peristaltic flow in the presence of heat generation against high values of the Reynolds number using a numerical technique is presented. The Finite Element Method with the assistance of Galerkin’s variational method has been used on the governing Navier-Stokes equation in the stream-vorticity form. The graphs of computed longitudinal velocity, temperature distribution and pressure rise per wavelength are plotted against different values of an emerging parameter using a stream function and vorticity. The presented results are valid beyond the restrictions of long wavelength and low Reynolds number limits. Moreover, large values of the Reynolds number increases pressure rise per wavelength.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 2; 279-292
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of dynamic buckling of FG plate due to heat flux pulse
Autorzy:
Czechowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/265612.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamic buckling
heat flux
finite element method
FGMs
ceramics
metoda elementów skończonych
ceramika
strumień ciepła
Opis:
The paper deals with a FEM analysis of dynamic buckling of functionally graded clamped plates under heat flux loading with huge power. The materials of structures as well as their properties are varying in each layer across the plate thickness formulated by the power law distribution. The heat flux was applied evenly to the whole ceramic surface. The analysis was developed in the ANSYS 14.5 software. The duration of the heat flux loading equal to a period of natural fundamental flexural vibrations of given structures was taken into consideration. To implement large deflections of structures, the Green-Lagrange nonlinear-displacement equations and the incremental Newton-Raphson algorithm were applied. An evaluation of the dynamic response of structures was carried out on basis of the Budiansky-Hutchinson criterion. The studies were conducted for different volume fraction distributions and different shapes of the heat flux loading. The computation results of the heat flux versus maximal plate deflection are shown and discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 1; 19-31
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of distribution of temperature in three-dimensional solid changing its shape during the process
Autorzy:
Bożek, B.
Mączka, C.
Powiązania:
https://bibliotekanauki.pl/articles/255226.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
parabolic partial differential equations
non-stationary distribution of heat
finite element method
Galerkin method
Opis:
The present paper suplements and continues [2]. Galerkin method for the Fourier-Kirchoff equation in the case when Omega(t) - equation domain, dependending on time t, is constructed. For special case Omega(t) rcup R2 the computer program for above method is written. Binaries and sources of this program are available on http://wms.mat.agh.edu.pl/~bozek.
Źródło:
Opuscula Mathematica; 2005, 25, 2; 169-179
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of changes in the thickness of a perforated plate of the heat exchanger on its structural stability
Wpływ zmian grubości płyty perforowanej wymiennika ciepła na stateczność konstrukcji
Autorzy:
Chudzik, A.
Świniarski, J.
Powiązania:
https://bibliotekanauki.pl/articles/282061.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
finite element method
heat exchangers
heating pipes
Opis:
One of the most important elements of heat exchangers are perforated bottoms. These are perforated plates of significant thickness, in which heating cartridge pipes are mounted. For the designers of heat exchangers, the strength analusis of the connection between the elements, which allows for the determination of the state of stress and calculation of displacements of the perforated bottom after fixing the pipes in it, is of special importance. It results from carried out computations that the maximum reduced stresses in the perforated bottom are significantly lower than the values of admissible stresses. In this paper, computations of stresses and strains for various thicknesses of the perforated bottom have been presented. As a results of a decrease in the thickness of the perforated bottom, its deflectionincrease, and thus the heating system pipes are more exposed to strains and losses of stability.
Jednym z istotnych elementów wymiennika ciepła są dna sitowe - płyty perforowane o znacznej grubości, w których zamocowane są rurki wkładu grzewczego. Dla konstruktorów wymienników ciepła istotna jest analiza wytrzymałościowa połączenia pozwalająca na określenie stanu naprężeń oraz obliczenie przemieszczeń dna sitowego po zamocowaniu rurek. Z przeprowadzonych obliczeń wynika, że maksymalne naprężenia zredukowane w dnie sitowym są dużo niższe od wartości naprężeń dopuszczalnych. W pracy przedstawiono obliczenia naprężeń i odkształceń dla różnych grubości dna sitowego. Na skutek zmniejszenia grubości dna sitowego zwiększa się jego napięcia, przez co rurki wkładu grzewczego bardziej są narażone na utratę stateczności.
Źródło:
Journal of Theoretical and Applied Mechanics; 2004, 42, 2; 325-334
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient simulations of large-scale convective heat transfer problems
Autorzy:
Goik, Damian
Banaś, Krzysztof
Bielański, Jan
Chłoń, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/2097965.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
convective heat transfer
finite element method
sparse linear equations
algebraic multigrid
Navier–Stokes equations
GMRES
block preconditioning
SUPG stabilization
MPI
PETSc
scalability
Opis:
We describe an approach for efficient solution of large-scale convective heat transfer problems that are formulated as coupled unsteady heat conduction and incompressible fluid-flow equations. The original problem is discretized over time using classical implicit methods, while stabilized finite elements are used for space discretization. The algorithm employed for the discretization of the fluid-flow problem uses Picard’s iterations to solve the arising nonlinear equations. Both problems (the heat transfer and Navier–Stokes equations) give rise to large sparse systems of linear equations. The systems are solved by using an iterative GMRES solver with suitable preconditioning. For the incompressible flow equations, we employ a special preconditioner that is based on an algebraic multigrid (AMG) technique. This paper presents algorithmic and implementation details of the solution procedure, which is suitably tuned – especially for ill-conditioned systems that arise from discretizations of incompressible Navier–Stokes equations. We describe a parallel implementation of the solver using MPI and elements from the PETSC library. The scalability of the solver is favorably compared with other methods, such as direct solvers and the standard GMRES method with ILU preconditioning.
Źródło:
Computer Science; 2021, 22 (4); 517--538
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steady-state and transient heat transfer through fins of complex geometry
Autorzy:
Taler, D.
Taler, J.
Powiązania:
https://bibliotekanauki.pl/articles/240664.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fin of complex geometry
fin efficiency
finite volume method
finite element method
geometria złożona
wydajność
metoda objętości skończonych
metoda elementów skończonych
Opis:
Various methods for steady-state and transient analysis of temperature distribution and efficiency of continuous-plate fins are presented. For a constant heat transfer coefficient over the fin surface, the plate fin can be divided into imaginary rectangular or hexangular fins. At first approximate methods for determining the steady-state fin efficiency like the method of equivalent circular fin and the sector method are discussed. When the fin geometry is complex, thus transient temperature distribution and fin efficiency can be determined using numerical methods. A numerical method for transient analysis of fins with complex geometry is developed. Transient temperature distributions in continuous fins attached to oval tubes is computed using the finite volume - finite element methods. The developed method can be used in the transient analysis of compact heat exchangers to calculate correctly the heat flow rate transferred from the finned tubes to the fluid.
Źródło:
Archives of Thermodynamics; 2014, 35, 2; 117-133
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Thermal Stresses and Strains Developing During the Heat Treatment of Windmill Shaft
Autorzy:
Cebo-Rudnicka, A.
Malinowski, Z.
Telejko, T.
Powiązania:
https://bibliotekanauki.pl/articles/354018.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stresses
fracture criterion
finite element method
Opis:
In the paper the results of evaluation of the temperature and stress fields during four cycles of the heat treatment process of the windmill shaft has been presented. The temperature field has been calculated from the solution to the heat conduction equation over the whole heat treatment cycles of the windmill shaft. To calculate the stress field an incremental method has been used. The relations between stresses and strains have been described by Prandtl-Reuss equation for the elastic-plastic body. In order to determine the changes in the temperature and stress fields during heat treatment of the windmill shaft self-developed software utilizing the Finite Element Method has been used. This software can also be used to calculate temperature changes and stress field in ingots and other axially symmetric products. In the mathematical model of heating and cooling of the shaft maximum values of the strains have been determined, which allowed to avoid the crack formation. The critical values of strains have been determined by using modified Rice and Tracy criterion.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 459-471
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of conjugate gradient algorithms performance on the example of steady-state axisymmetric heat transfer problem
Autorzy:
Ocłoń, P.
Łopata, S.
Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/240612.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conjugate gradient method
finite element method
finned circular tube
metoda gradientu sprzężonego
metoda elementów skończonych
rury żebrowane
Opis:
The finite element method (FEM) is one of the most frequently used numerical methods for finding the approximate discrete point solution of partial differential equations (PDE). In this method, linear or nonlinear systems of equations, comprised after numerical discretization, are solved to obtain the numerical solution of PDE. The conjugate gradient algorithms are efficient iterative solvers for the large sparse linear systems. In this paper the performance of different conjugate gradient algorithms: conjugate gradient algorithm (CG), biconjugate gradient algorithm (BICG), biconjugate gradient stabilized algorithm (BICGSTAB), conjugate gradient squared algorithm (CGS) and biconjugate gradient stabilized algorithm with l GMRES restarts (BICGSTAB(l)) is compared when solving the steady-state axisymmetric heat conduction problem. Different values of l parameter are studied. The engineering problem for which this comparison is made is the two-dimensional, axisymmetric heat conduction in a finned circular tube.
Źródło:
Archives of Thermodynamics; 2013, 34, 3; 15-44
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of slim obstacle geometry on the flow and heat transfer in microchannels
Autorzy:
Kmiotek, M.
Kucaba-Piętal, A.
Powiązania:
https://bibliotekanauki.pl/articles/200994.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microchannels
obstacle
finite element method
mikrokanały
przeszkody
metoda elementów skończonych
Opis:
This paper presents a computational study on hydrodynamic and heat transfer characteristics of the laminar flow inside a rectangular 2D microchannel of height H, which includes a slim micro obstacle of height h and width w placed on the lower wall of the channel. The Reynolds number varies between 20 and 200. Three different values of height h and two different shapes of the slim obstacles: triangular and rectangular one, are considered. Thus, a total of 24 geometrical configurations of fluid flow are analyzed. Fluid flow equations are solved using the commercial CFD package of ADINA R&D, Inc. 9.1. Detailed analysis of the fluid velocity field and streamlines is carried out to investigate the flows in recirculation zone behind the obstacle. Results obtained show that the rectangular obstacle caused larger vortex formation in fluid flow. For flows with larger value of the (h/H) ratio, an increase in the value of loss coefficient factors is observed. Meanwhile, the increased Reynolds number causes the vortex zone behind the rectangular obstacle to be larger than behind the triangular one.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 2; 111-118
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of magnetohydrodynamic (MHD) nanofluid flow with heat and mass transfer over a porous stretching sheet
Autorzy:
Odesola, A. S.
Abiala, I. O.
Akinpelu, F. O.
Fenuga, O. J.
Powiązania:
https://bibliotekanauki.pl/articles/1839771.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
metoda elementów skończonych
wymiana ciepła
wymiana masy
magnetohydrodynamika
finite element method
heat and mass transfer
MHD
nanofluid flow
porous stretching sheet
Opis:
This work investigates a three-dimensional Magnetohydrodynamic (MHD) nanofluid flow with heat and mass transfer over a porous stretching sheet. Firstly, partial differential equations are transformed into coupled non-linear ordinary differential equations through a similarity variables transformation and solved by Galerkin Finite Element Methods (FEM). The effects of thermal radiation, viscous dissipation and chemical reaction on the fluid flow are considered. The behaviour and properties of pertinent flow parameters on the velocity, temperature and concentration profiles are presented and discussed graphically. The effects of the friction coefficient parameter, Nusselt and Sherhood numbers are also shown and considered using tables. The work is in good agreement in comparison with the recent work in literature.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 162-174
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies