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    Wyświetlanie 1-15 z 15
    Tytuł:
    Magnetosonic Excitation of the Entropy Perturbations in a Plasma with Thermal Conduction Depending on Temperature
    Autorzy:
    Perelomova, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2097706.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    nonlinear magnetohydrodynamics
    magnetosonic heating
    thermal conduction of a plasma
    Opis:
    Nonlinear excitation of the entropy perturbations by magnetosonic waves in a uniform and infinite plasma model is considered. The wave vector of slow or fast mode forms an arbitrary angle θ (0 ≤ θ ≤ π) with the equilibrium straight magnetic field, and all perturbations are functions of the time and longitudinal coordinate. Thermal conduction is the only factor which destroys isentropicity of wave perturbations and causes the nonlinear excitation of the entropy mode. A dynamic equation is derived which describes excitation of perturbation in the entropy mode in the field of dominant magnetosonic mode. Effects associatiated with temperature dependent and anisotropic thermal conduction are considered and discussed.
    Źródło:
    Archives of Acoustics; 2021, 46, 3; 389-397
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Process analysis of the hot plate welding of drive belts
    Autorzy:
    Wałęsa, Krzysztof
    Malujda, Ireneusz
    Talaśka, Krzysztof
    Wilczyński, Dominik
    Powiązania:
    https://bibliotekanauki.pl/articles/970577.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    hot plate welding
    round drive belts
    heating
    thermal conduction
    plasticizing
    Opis:
    Most industrial machines use belt transmission for power transfer. These mechanisms often use the round belts of several milli-metres in diameter that are made of thermoplastic elastomers, especially polyurethane. Their production process calls for bonding the ma-terial, which is often performed by hot plate butt welding. In order to achieve proper design of an automatic welding machine, the authors analysed the hot plate welding process of round belts. This process consists of five phases. It is necessary to recognize all the physical phenomena that occur during welding, especially those connected with thermomechanical properties of material. This knowledge is neces-sary to determine the temperature distribution during each step of the process. The paper presents a standard welding cycle together with an explanation of the physical phenomena in each phase. An analysis of these fundamentals will be used to derivate the function of tem-perature distribution during all process phases. In addition, some assumptions for calculation of temperature distribution and some funda-mental physic correlations were presented.
    Źródło:
    Acta Mechanica et Automatica; 2020, 14, 2; 84-90
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlations for the thermal conductivity of selected steel grades as a function of temperature in the range of 0–800◦C
    Autorzy:
    Wyczółkowski, Rafał
    Strychalska, Dominika
    Bagdasaryan, Vazgen
    Powiązania:
    https://bibliotekanauki.pl/articles/2134935.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal conductivity
    heat transfer
    least squares method
    thermal conduction analysis
    thermal treatment of steel
    Opis:
    Reliable knowledge of thermo-physical properties of materials is essential for the interpretation of solidification behaviour, forming, heat treatment and joining of metallic systems. It is also a precondition for precise simulation calculations of technological processes. Numerical calculations usually require the knowledge of temperature dependencies of three basic thermo-physical properties: thermal conductivity, heat capacity and density. The objective of this work is to find a correlation that fits the thermal conductivity of selected steel grades as a function of temperature (within the range of 0–800◦C) and carbon content (within the range of 0.1–0.6%). The starting point for the analysis are the experimental data on thermal conductivity taken from literature. Using the method of least squares it was possible to fit an equation which allows calculating the thermal conductivity of steel depending on the temperature and carbon content. Two kinds of equations have been analyzed: a linear one (a linear model) and a second degree polynomial (a non-linear model). The thermal conductivity obtained by linear and nonlinear models varies on average from the measured values by 3% and 2.6% respectively.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 3; 29--45
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring of the temperature regime and thermo-technical properties of railway subgrade materials
    Monitorowanie parametrów temperaturowych i własności termotechnicznych materiałów podtorza kolejowego
    Autorzy:
    Izvolt, L.
    Kupculiak, P.
    Pultznerova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/198645.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    transport kolejowy
    warunki klimatyczne
    głębokość zamarzania
    moduł termicznego przewodzenia
    railway
    climatic conditions
    frost index
    depth of frost
    thermal conduction modulus
    Opis:
    The modernisation of the Slovak Railways infrastructure has become a challenge to re-evaluate the dimensioning of the railway subgrade design for non-traffic loading, particularly in terms of the application of new materials into its construction and gradually changing climatic conditions. The first part of the paper shows the results of the long-term monitoring of the temperature regime of the railway subgrade on the railway track structure in the test stand (the position of the zero isotherm, the behaviour of the temperatures in the design layers and in their interfaces, the temperature of the air). The second part presents the results of the experimental determination of the thermo-technical properties of the built up materials into the railway subgrade of the trial stand structure (the thermal conductivity modulus, specific thermal capacity). The conclusion deals with the preliminary results derived from the comparison of the findings from both experimental measurements.
    Modernizacja Kolei Słowackich napotkała na szereg wyzwań związanych ze zmianą podejścia do gradacji i wymiarowania podtorza w warunkach braku obciążenia oraz w szczególności z zastosowaniem nowych materiałów konstrukcyjnych, zwłaszcza w kontekście stopniowo zmieniających się warunków klimatycznych. W pierwszej części artykułu przedstawiono wyniki długoterminowego monitorowania parametrów temperaturowych podtorza na stanowisku testowym toru kolejowego (pozycja izotermy zerowej, kształtowanie się temperatur w warstwach projektowych i w powierzchniach styku, temperatura powietrza). W drugiej części przedstawiono wyniki doświadczalne badań własności termotechnicznych materiałów konstrukcyjnych podtorza na stanowisku testowym (moduł przewodnictwa cieplnego, termiczna pojemność właściwa). W końcowej części artykułu przedstawiono wstępne porównanie wyników obu badań doświadczalnych.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2013, 80; 41-52
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An idea of a measurement system for determining thermal parameters of heat insulation materials
    Autorzy:
    Chudzik, S.
    Minkina, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/220464.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal conductivity
    artificial neural networks
    inverse heat conduction problem
    Opis:
    The article presents the prototype of a measurement system with a hot probe, designed for testing thermal parameters of heat insulation materials. The idea is to determine parameters of thermal insulation materials using a hot probe with an auxiliary thermometer and a trained artificial neural network. The network is trained on data extracted from a nonstationary two-dimensional model of heat conduction inside a sample of material with the hot probe and the auxiliary thermometer. The significant heat capacity of the probe handle is taken into account in the model. The finite element method (FEM) is applied to solve the system of partial differential equations describing the model. An artificial neural network (ANN) is used to estimate coefficients of the inverse heat conduction problem for a solid. The network determines values of the effective thermal conductivity and effective thermal diffusivity on the basis of temperature responses of the hot probe and the auxiliary thermometer. All calculations, like FEM, training and testing processes, were conducted in the MATLAB environment. Experimental results are also presented. The proposed measurement system for parameter testing is suitable for temporary measurements in a building site or factory.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 2; 261-273
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of thermal diffusivity values based on the inverse problem of heat conduction - numerical analysis
    Autorzy:
    Adamowicz, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/2204678.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    thermal diffusivity
    inverse heat conduction problem
    impulse heating
    finite element analysis
    Opis:
    This paper presents a discussion on the accuracy of the method of determining the thermal diffusivity of solids using the solution of the inverse heat conduction equation. A new measurement data processing procedure was proposed to improve the effectiveness of the method. Using the numerical model, an analysis of the sensitivity of the method of thermal diffusivity determination to changes in operational and environmental parameters of the test was carried out. The obtained results showed that the method was insensitive to the parameters of the thermal excitation impulse, the thickness of the tested sample, and the significant influence of convection cooling on its accuracy. The work was completed with the formulation of general conclusions concerning the conditions for determining the thermal diffusivity of materials with the use of the described method.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 4; 399--407
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduced differential transform method for thermoelastic problem in hyperbolic heat conduction domain
    Autorzy:
    Chaudhari, K. K.
    Sutar, C. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839891.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przewodzenie ciepła
    przemieszczenie termiczne
    naprężenie termiczne
    hyperbolic heat conduction
    thermal stresses
    thermal displacement
    rectangular plate
    reduced differential transform
    Opis:
    In the present study, we have applied the reduced differential transform method to solve the thermoelastic problem which reduces the computational efforts. In the study, the temperature distribution in a two-dimensional rectangular plate follows the hyperbolic law of heat conduction. We have obtained the generalized solution for thermoelastic field and temperature field by considering non-homogeneous boundary conditions in the x and y direction. Using this method one can obtain a solution in series form. The special case is considered to show the effectiveness of the present method. And also, the results are shown numerically and graphically. The study shows that this method provides an analytical approximate solution in very easy steps and requires little computational work.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 76-87
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of non-Fourier thermal waves interaction in a solid material
    Autorzy:
    Lenarczyk, Marcin
    Domański, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/240472.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    non-Fourier equation
    heat waves
    hyperbolic heat conduction
    thermal wave interaction
    fale cieplne
    przewodzenie ciepła
    Opis:
    In this paper, effects of non-Fourier thermal wave interactions in a thin film have been investigated. The non-Fourier, hyperbolic heat conduction equation is solved, using finite difference method with an implicit scheme. Calculations have been carried out for three geometrical configurations with various film thicknesses. The boundary condition of a symmetrical temperature step-change on both sides has been used. Time history for the temperature distribution for each investigated case is presented. Processes of thermal wave propagation, temperature peak build-up and reverse wave front creation have been described. It has been shown that (i) significant temperature overshoot can appear in the film subjected to symmetric thermal load (which can be potentially dangerous for reallife application), and (ii) effect of temperature amplification decreases with increased film thickness.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 1; 115-126
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Axisymmetric thermal stresses in a half-space in the framework of fractional thermoelasticity
    Autorzy:
    Povstenko, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/121806.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    teoria naprężeń cieplnych
    naprężenia cieplne
    termosprężystość
    przewodnictwo cieplne
    pochodne ułamkowe
    theory of thermal stresses
    thermal stresses
    thermoelasticity
    heat conduction
    fractional derivatives
    Opis:
    A theory of thermal stresses based on the time-fractional heat conduction equation is considered. The Caputo fractional derivative is used. The fundamental solution to the axisymmetric heat conduction equation in a half-space under the Dirichlet boundary condition and the associated thermal stresses are investigated.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2014, 19; 207-216
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the stationary thermal state of simple geometry layered structures with themperature dependent heat conductivity factors
    Autorzy:
    Makhorkin, M
    Makhorkin, I.
    Makhorkina, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/411285.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    multilayer structures
    solids of simple geometry
    steady thermal state
    temperature-dependent heat conduction factors
    generalized functions
    Opis:
    An analytical-numerical method to determine the one-dimensional stationary thermal state of simple geometry multilayer structures for arbitrary dependences of heat-conductivity factors on temperature is proposed (the multilayer bodies of thermosensitive materials, referred to one of the classical orthogonal coordinate systems are considered, the thermal state caused by thermal load is characterized by a onedimensional stationary temperature field. Approbation of the methodology by studying the stationary thermal state of a two-layer cylinder is realized. The cases of existence of a closed-form analytic solutions for the nonlinear heat conduction problem are considered.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 3; 23-28
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of the Thermal Conductivity Coefficient in the Heat Conduction Model with Fractional Derivative
    Autorzy:
    Brociek, R.
    Słota, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382791.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat conduction equation
    thermal conductivity coefficient
    inverse problem
    fractional derivative
    thermal conductivity
    model przewodzenia ciepła
    współczynnik przewodzenia ciepła
    problem odwrotny
    pochodna ułamkowa
    przewodność termiczna
    Opis:
    Main goal of the paper is to present the algorithm serving to solve the heat conduction inverse problem. Authors consider the heat conduction equation with the Riemann-Liouville fractional derivative and with the second and third kind boundary conditions. This type of model with fractional derivative can be used for modelling the heat conduction in porous media. Authors deal with the heat conduction inverse problem, which, in this case, consists in identifying an unknown thermal conductivity coefficient. Measurements of temperature, in selected point of the region, are the input data for investigated inverse problem. Basing on this information, a functional describing the error of approximate solution is created. Minimizing of this functional is necessary to solve the inverse problem. In the presented approach the Ant Colony Optimization (ACO) algorithm is used for minimization.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 38-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal management in vertical-external-cavity surface-emitting lasers : an analytical approach
    Autorzy:
    Szymański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/378457.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
    Tematy:
    przepływ ciepła
    system VECSEL
    przewodność cieplna
    lasery
    model analityczny
    heat conduction
    VECSEL system
    thermal conductivity
    lasers
    analytical model
    Opis:
    This paper tackles with thermal management in optically pumped vertical-external-cavity surface-emitting lasers. The considerations are based on one-dimensional, stationary solution of heat conduction equation. It is shown that even such simplified model can provide useful hints for designing devices of this type.
    Źródło:
    Electron Technology : Internet Journal; 2007, 39, 3; 1-4
    1897-2381
    Pojawia się w:
    Electron Technology : Internet Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Thermal Diffusivity of Austenitic Steel Using Pulsed Infrared Thermography
    Wyznaczanie dyfuzyjności cieplnej stali austenitycznej przy wykorzystaniu aktywnej termografii podczerwieni
    Autorzy:
    Kochanowski, K.
    Oliferuk, W.
    Płochocki, Z.
    Adamowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354398.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal diffusivity
    pulsed infrared thermography
    heat conduction
    austenitic steel
    dyfuzyjność cieplna
    aktywna termografia podczerwona
    przewodzenia ciepła
    stal austenityczno-ferrytyczna
    Opis:
    The simple method of determining thermal diffusivity of solid materials at room temperature using the pulsed infrared thermography (IRT) is proposed. The theoretical basis of the method and experimental results are presented. The study was conducted on austenitic steel 316L. Theobtained results show that the thermal diffusivity value of the tested steel determined by means of pulsed infrared thermography is very approximate to the values given in the literature, obtained by using more complicated methods. The differences between these values are 0.5%.
    W niniejszej pracy przedstawiono prostą metodę wyznaczania dyfuzyjności cieplnej ciał stałych w temperaturze pokojowej przy wykorzystaniu aktywnej termografii podczerwieni. Zaprezentowane zostały teoretyczne podstawy metody oraz wyniki badań doświadczalnych. Badanie przeprowadzono dla stali austenitycznej 316L. Otrzymane rezultaty pokazują, że wyznaczona wartość dyfuzyjności cieplnej badanej stali jest bardzo bliska wartościom podanym w literaturze, otrzymanym za pomocą bardziej skomplikowanych metod. Różnica między tymi wartościami sięga zaledwie 0,5%.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 893-897
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of the thermal dynamic performance of the residential buildings walls
    Autorzy:
    Kalinović, Saša M.
    Djoković, Jelena M.
    Nikolić, Ružica R.
    Hadzima, Branislav
    Powiązania:
    https://bibliotekanauki.pl/articles/104140.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    wall's specific mass
    heat conduction coefficient
    periodical heat transfer
    reduction factor
    thermal inertia
    ściany
    współczynnik przewodzenia ciepła
    okresowe przekazywanie ciepła
    współczynnik redukcji
    bezwładność cieplna
    Opis:
    Calculation of the thermal dynamic properties of the multi-layer wall isolation of residential buildings is presented in this paper. Taking into account that the final objective is to create a building with the highest energy efficiency ratio, i.e. with the lowest energy consumption, both for heating and cooling, it is necessary to realize the good thermal characteristics of the multi-layer wall. To obtain the optimal solution for the wall's structure, various wall structures with different thicknesses of the individual layers, were analyzed. Based on results, presented in this paper, one can conclude that for walls with the same total thickness, but various thicknesses of the individual layers, that constitute the complete wall structure, the differences appear in the delay of the change of the walls outside temperature. In that way, by varying those individual layers' thicknesses, one can obtain the optimal solution for the wall structure with the highest savings of energy.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 212-221
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimum heating of cylindrical pressure components weakened by holes
    Autorzy:
    Dzierwa, P.
    Taler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240098.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kotły
    naprężenie termiczne
    normy
    odwrotne zagadnienia przewodzenia ciepła
    optymalizacja nagrzewania
    zbiorniki ciśnieniowe
    boiler standards
    heating optimization
    inverse heat conduction problem
    pressure vessels
    thermal stress
    Opis:
    A method for determining time-optimum medium temperature changes is presented. The heating of the pressure elements will be conducted so that the circumferential stress caused by pressure and fluid temperature variations at the edge of the opening at the point of stress concentration, do not exceed the allowable value. In contrast to present standards, two points at the edge of the opening are taken into consideration. The first point, P[1], is located at the cross section and the second, P[2], at the longitudinal section of the vessel. It will be shown that the optimum temperature courses should be determined with respect to the total circumferential stress at the point P[2], and not, as in the existing standards due to the stress at the point P[1]. Optimum fluid temperature changes are assumed in the form of simple time functions. For practical reasons the optimum temperature in the ramp form is preferred. It is possible to increase the fluid temperature stepwise at the beginning of the heating process and then increase the fluid temperature with the constant rate. Allowing stepwise fluid temperature increase at the beginning of heating ensures that the heating time of a thick-walled component is shorter than heating time resulting from the calculations according to EN 12952-3 European Standard. @eng
    Źródło:
    Archives of Thermodynamics; 2012, 33, 3; 111-121
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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