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Wyszukujesz frazę "44.25.+F" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Investigation of heat insulation performance of hollow clay bricks filled with perlite
    Autorzy:
    Arıcı, M.
    Yılmaz, B.
    Karabay, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068608.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.05.Sv
    44.10.+i
    44.25.+f
    44.40.+a
    Opis:
    In this study, the possibility of enhancing heat insulation performance of hollow bricks by filling the cavities with perlite is investigated. A conjugate heat transfer by conduction, convection and radiation in different hollow bricks are analyzed numerically to assess their thermal performance. Calculations are performed for three scenarios for each type of hollow brick: (i) cavities are filled with air, (ii) half of the cavities are filled with perlite while the other half is filled with air, (iii) all cavities are filled with perlite. The benefit of filling cavities with perlite is justified quantitatively for each investigated hollow brick type. It is concluded that the enhancement in insulation performance can be up to 15.6% and 27.5% for half-perlite and full-perlite cases, respectively, depending on the brick type.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 266-268
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prevailing Parameter Evaluation with Heat Transfer Analysis of Absorber Plate in the Flat Solar Collector
    Autorzy:
    Er, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031652.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.40.-J
    44.40.+A
    44.25.+F
    44.05.E
    Opis:
    Solar radiation coming to a solar panel is absorbed and converted into thermal energy, increasing its temperature. This study is focused on the solar thermal panels. As known, the analysis of thermal performance of the collector includes such parameters as solar irradiance, ambient temperature and configuration of collectors etc. In this study, thermal analysis of the absorbent plate of a flat plate solar collector and the temperature transfer to the working fluid, were investigated. During thermal analysis the absorbent plate was considered as an one-dimensional fin. It is assumed that lower surface of the solar panel is ideally insulated in this study. Therefore solar irradiance and heat loss to the environment are analyzed at the upper surface of the absorber plate. This study is aimed to investigate the relations of temperature distribution on the absorber plate and heat transfer from the absorber plate to the fluid. The achievable maximum fluid temperature at the practical working conditions, which quantifies the availability of usable heat energy, obtained by the collector, has been determined as a function of solar irradiance. Procedure is based on steady state analysis and on calculation of the thermal performance of flat-plate collector. The effects of the parameters, which determine the collector efficiency, have been investigated by evaluating all results. Results show that the flat-plate collector performs good and provides the desired quantity of hot water.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1025-1029
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Thermal Field in Mineral Transformer Oil Based Magnetic Fluids
    Autorzy:
    Kosterec, M.
    Kurimský, J.
    Cimbala, R.
    Čonka, Z.
    Kruželák, L.
    Rajňák, M.
    Timko, M.
    Kopčanský, P.
    Vargová, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032149.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    44.25.+f
    44.27.+g
    47.11.Fg
    47.65.Cb
    Opis:
    Growing interest in the use of magnetic fluids in power systems especially in transformers as insulation and a coolant is nowadays registered. Magnetisable nanofluids, which are used in cooling systems as an alternative to mineral transformer oil, are characterized by lower concentration of magnetic nanoparticles. The magnetic fluid has better heat transfer and dielectric properties such as breakdown than mineral transformer oil and it can be used to improve heat flow, thereby increasing the ability of the active parts to resist failures such as electromagnetic pulses. External magnetic field may be used for forced circulation of magnetic fluid. Magnetic force inside the magnetic fluid can be adequately controlled by adjusting the incident magnetic field. This paper presents thermal distribution, fluid flow and cooling ability of mineral transformer oil and magnetic fluid based on mineral transformer oil. The concentration of Fe₃O₄ magnetic nanoparticles is 0.15% volume of mineral transformer oil. The thermal field is generated by a steel conductor. Thermal distributions in mineral transformer oil and magnetic fluid are investigated and differences for both cases are discussed in the paper.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 937-939
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Aspect Ratio on Natural Convection in a Cavity with Wavy Walls
    Autorzy:
    Arici, M.
    Kan, M.
    Karabay, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401974.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    44.25.+f
    47.15.Rq
    47.55.P-
    47.20.Bp
    Opis:
    In this study, flow characteristics and natural convection in a cavity with two wavy walls is studied numerically. The wavy walls of the cavity are isothermal and at different temperatures while other straight walls are adiabatic. The fluid considered inside the cavity is air having Prandtl number of 0.71. A parametric study is conducted for various aspect ratios (1 ≤ AR ≤ 5), Rayleigh numbers (10³ ≤ $Ra_{H}$ ≤ 10⁶) and inclination angles (0° ≤ θ ≤ 180°). Streamlines, isotherms and local and mean Nusselt numbers are presented to show the effect of the investigated parameters on the flow field and heat transfer.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-197-B-200
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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