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 "thermal radiation" wg kryterium: Wszystkie pola

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-9 z 9
    Tytuł:
    Destruction of Moulding Sands with Chemical Binders Caused by the Thermal Radiation of Liquid Metal
    Autorzy:
    Zych, J.
    Mocek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382547.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sand mould
    thermal destruction
    thermal radiation
    heating of mould
    loss of strength
    masa formierska
    rozkład termiczny
    promieniowanie cieplne
    Opis:
    The obtained results of heating of sand moulds with binders by means of a thermal radiation of liquid metal are presented in this study. Standard samples for measuring Rg made of the tested moulding sands were suspended at the lower part of the cover which was covering the crucible with liquid metal (cast iron), placed in the induction furnace. The authors own methodology was applied in investigations. The progressing of the samples surface layers heating process was determined as the heating time function. Samples of a few kinds of moulding sands with chemical binders were tested. Samples without protective coatings as well as samples with such coatings were tested. The influence of the thermal radiation on bending resistance of samples after their cooling was estimated. The influence of several parameters such as: time of heating, distance from the metal surface, metal temperature, application of coatings, were tested. A very fast loss of strength of moulding sands with organic binders was found, especially in cases when the distance between metal and sample surfaces was small and equaled to 10÷15 mm. Then, already after app. 15 seconds of the radiation (at Tmet=1400°C), the resistance decreases by nearly 70%. Generally, moulding sands with organic binders are losing their strength very fast, while moulding sands with water glass at first increase their strength and later slightly lose. The deposition of protective coatings increases the strength of the mould surface layers, however does not allow to retain this strength after the metal thermal radiation.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 95-100
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Triple diffusive flow of Casson nanofluid with buoyancy forces and nonlinear thermal radiation over a horizontal plate
    Autorzy:
    Archana, Manjappa
    Gireesha, Bijjanal Jayanna
    Prasannakumara, Ballajja Chandrappa
    Powiązania:
    https://bibliotekanauki.pl/articles/240608.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    triple diffusion
    casson nanofluid
    nonlinear thermal radiation
    buoyancy force
    siła wyporu
    promieniowanie cieplne
    Opis:
    The presence of more than one solute diffused in fluid mixtures is very often requested for discussing the natural phenomena such as transportation of contaminants, underground water, acid rain and so on. In the paper, the effect of nonlinear thermal radiation on triple diffusive convective boundary layer flow of Casson nanofluid along a horizontal plate is theoretically investigated. Similarity transformations are utilized to reduce the governing partial differential equations into a set of nonlinear ordinary differential equations. The reduced equations are numerically solved using Runge-Kutta-Fehlberg fourth-fifth order method along with shooting technique. The impact of several existing physical parameters on velocity, temperature, solutal and nanofluid concentration profiles are analyzed through graphs and tables in detail. It is found that, modified Dufour parameter and Dufour solutal Lewis number enhances the temperature and solutal concentration profiles respectively.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 1; 49-69
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Method of Thermal Conductivity Measurement Using Stefan-Boltzmann Law
    Autorzy:
    Leśniewski, W.
    Czekaj, E.
    Wieliczko, P.
    Wawrylak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/356312.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal conductivity
    thermal radiation
    ceramic shell mold
    aluminum casting
    Opis:
    The article presents a novel method that allows measurement of thermal conductivity that is based on Stefan-Boltzmann law. The developed method can be used to determine thermal conductivity of ceramic investment casting molds. The methodology for conducting thermal conductivity tests of ceramic material samples is presented. Knowledge of the value of thermal capacity and thermal conductivity as a function of temperature enables computer simulations of the process of cooling and solidification of liquid metal in a mold.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 311-315
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Passive cooling through the atmospheric window for vehicle temperature control
    Autorzy:
    Khan, Umara
    Zevenhoven, Ron
    Powiązania:
    https://bibliotekanauki.pl/articles/1955001.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal radiation
    passive cooling
    vehicle skylight
    greenhouse effect
    computational fluid dynamics
    Opis:
    One of the most energy-intensive activities for a vehicle is space air conditioning, for either cooling or heating. Considerable energy savings can be achieved if this can be decoupled from the use of fuel or electricity. This study analyzes the opportunities and effectiveness of deploying the concept of passive cooling through the atmospheric window (i.e. the 8– 14 nm wavelength range where the atmosphere is transparent for thermal radiation) for vehicle temperature control. Recent work at our institute has resulted in a skylight (roof window) design for passive cooling of building space. This should be applicable to vehicles as well, using the same materials and design concept. An overall cooling effect is obtained if outgoing (long wavelength greater than 4 nm) thermal radiation is stronger than the incoming (short wavelength less than 4 nm) thermal radiation. Of particular interest is to quantify the passive cooling of a vehicle parked under direct/indirect sunlight equipped with a small skylight, designed based on earlier designs for buildings. The work involved simulations using commercial computational fluid dynamics software implementing (where possible) wavelengthdependency of thermal radiation properties of materials involved. The findings show that by the use of passive cooling, a temperature difference of up to 7–8 K is obtained with an internal gas flow rate of 0.7 cm/s inside the skylight. A passive cooling effect of almost 27 W/m2 is attainable for summer season in Finland. Comparison of results from Ansys Fluent and COMSOL models shows differences up to about 10 W/m2 in the estimations.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 3; 25--44
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of temperature field in large-span steel structure under radiation-thermal-fluid coupling
    Autorzy:
    Jiang, Pengcheng
    Powiązania:
    https://bibliotekanauki.pl/articles/2203443.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    The non-uniformity of temperature field distribution of long-span steel structure is proportional to the intensity of solar radiation. Based on the background of Guangzhou Baiyun Station large-span complex steel roof structure, this paper studies the non-uniformtemperature field distribution of large-span steel structure under the Summer Solstice daily radiation-thermal-fluid coupling action based on Star-ccm+ finite element software, and uses Spa2000 software to analyze the stress and deformation of steel roof under temperature action. Combined with the on-site temperature monitoring, the maximum difference with the measured value is 2.5°C compared with the numerical simulation results, which verifies the validity of the finite element simulation. The results show that: from 8:00, with the increase of solar altitude angle, the intensity of solar radiation increases, the temperature rises, and the temperature distribution of large-span steel structure becomes more and more non-uniform. From14:00 to18:00, the solar radiation weakens, and the temperature distribution tends to be uniform. Finally, reasonable construction suggestions and measures are proposed to reduce the adverse effects of temperature effects, which can provide theoretical references for the safe construction and normal operation of large-span steel structures located in the subtropics.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 1; 661--674
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bidirectionally stretched flow of Jeffrey liquid with nanoparticles, Rosseland radiation and variable thermal conductivity
    Autorzy:
    Archana, M.
    Gireesha, B. J.
    Rashidi, M. M.
    Prasannakumara, B. C.
    Gorla, R. S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/240409.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat mass transfer
    jeffrey nanofluid
    variable thermal conductivity
    rosseland approximation
    suction
    ciepło
    masa
    zmienna przewodność cieplna
    aproksymacja
    ssanie
    Opis:
    Heat and mass transfer stretched flow of an incompressible, electrically conducting Jeffrey fluid has been studied numerically. Nanoparticles are suspended in the base fluid and it has many applications such as cooling of engines, thermal absorption systems, lubricants fuel cell, nanodrug delivery system and so on. Temperature dependent variable thermal conductivity with Rosseland approximation is taken into account and suction effect is employed in the boundary conditions. The governing partial differential equations are first transformed into set of ordinary differential equations using selected similarity transformations, which are then solved numerically using Runge-Kutta-Felhberg fourth-fifth order method along with shooting technique. The flow, heat and mass transfer characteristics with local Nusselt number for various physical parameters are presented graphically and a detailed discussion regarding the effect of flow parameters on velocity and temperature profiles are provided. It is found that, increase of variable thermal conductivity, radiation, Brownian motion and thermophoresis parameter increases the rate of heat transfer. Local Nusselt number has been computed for various parameters and it is observed that, in the presence of variable thermal conductivity and Rosseland approximation, heat transfer characteristics are higher as compared to the constant thermal conductivity and linear thermal radiation.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 4; 33--57
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal analysis of generalized Burgers nanofluid over a stretching sheet with nonlinear radiation and non uniform heat source/sink
    Autorzy:
    Kumar, K. G.
    Ramesh, G. K.
    Gireesha, B. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240767.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    burgers nanofluid
    non-uniform heat source/sink
    non-linear radiation
    magnetic field
    stretching surface
    pole magnetyczne
    powierzchnia
    rozciąganie
    promieniowanie
    nanofluid
    Opis:
    The work deals with the heat analysis of generalized Burgers nanofluid over a stretching sheet. The Rosseland approximation is used to model the non-linear thermal radiation and incorporated non-uniform heat source/sink effect. The governing equations reduced to a set of nonlinear ordinary differential equations under considering the suitable similarity transformations. The obtained ordinary differential equations equations are solved numerically by Runge-Kutta-Fehlberg order method. The effect of important parameters on velocity, temperature and concentration distributions are analyzed and discussed through the graphs. It reveals that temperature increases with the increase of radiation and heat source/sink parameter.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 2; 97-122
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The thermal condition of the active layer in the permafrost at Hornsund, Spitsbergen
    Autorzy:
    Leszkiewicz, Jan
    Caputa, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2052049.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Spitsbergen
    ground temperature
    short-wave radiation
    meteorological seasons
    Źródło:
    Polish Polar Research; 2004, 25, 3-4; 223-239
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Destrukcja mas z żywicą furanową wywoływana promieniowaniem cieplnym ciekłego metalu
    Destruction of Moulding Sands with Furan Resin Caused by Heat Radiation of Liquid Metal
    Autorzy:
    Zych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381874.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    formy piaskowe
    żywica furanowa
    nagrzewanie form
    destrukcja termiczna
    utrata wytrzymałości
    sand moulds
    furan resin
    heating form
    thermal destruction
    loss of strength
    Opis:
    W pracy przedstawiono wyniki badań procesu nagrzewania elementów form piaskowych wykonanych z masy z żywicą furanową wywoływane promieniowanie cieplnym ciekłego żeliwa. Próbki masy umieszczano w bliskiej odległości (10-15 mm) od powierzchni górnej żeliwa znajdującego się w tyglu. Zastosowano autorską metodę badań. Wyznaczono przebiegi nagrzewania powierzchniowej warstwy próbek w funkcji czasu nagrzewania. Badaniami objęto powierzchnie próbek bez powłok i z powłokami ochronnymi. Wyznaczono wpływ czasu oddziaływania promieniowania na wytrzymałość na zginanie próbek po ich wystudzeniu do temperatury otoczenia. Stwierdzono, iż przy temperaturze żeliwa 1400 oC i przybliżeniu powierzchni próbki na odległość 10÷15 mm już po około 15 sekundach wytrzymałość masy zmniejsza się o blisko 70%. Nanoszenie powłok ochronnych zwiększa wytrzymałość powierzchniowej warstwy niekiedy kilkakrotnie. Nie pozwala jednak zachować wytrzymałości masy po poddaniu jej działaniu promieniowania cieplnego ciekłego żeliwa.
    The work presents the results of tests of the heating process of sand-mould elements made of sands wit furan resin caused by heat radiation of liquid cast iron. Samples of the moulding sands were placed in near proximity (10-15 mm) of the top surface of cast iron located in a crucible. An original research method of the author was used. Trajectories of heating of the surface layer of samples in the time function were determined. The testing covered surfaces of layers both with and without coatings. The impact of the time of influence of the radiation on the samples' bending strength after cooldown to environment temperature was determined. It was found that for cast iron of the temperature 1400 oC and with samples moved closer to 10÷15 mm bending strength of the mass decreases by almost 70% after as little as 15 seconds. Laying down protective coatings increases resistance of the surface layer, sometimes even multiplying it. However it does not enable saving the mass' resistance after it is subjected to heat radiation of liquid cast iron.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4 spec.; 143-148
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

      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