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    Wyświetlanie 1-7 z 7
    Tytuł:
    Convective and non-convective wind gusts in Poland, 2001-2015
    Autorzy:
    Kolendowicz, L.
    Taszarek, M.
    Czernecki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/108594.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
    Tematy:
    wind gust
    thunderstorm
    convective
    non-convective
    severe weather
    Polska
    Opis:
    The main aim of the article is to present the climatology of the peak wind gust frequency in Poland caused by the impact of both atmospheric circulation and the presence of thunderstorm clouds. Nine meteorological stations for the measurement period of 2001-2015 were taken into account. Only SYNOP reports with a peak wind gust higher or equal to 15 m s-1 in thunderstorm and non-thunderstorm days are considered in this study. The results indicate that the highest threat in terms of frequency and strength of peak wind gusts due to convection occurs in July. In winter, thunderstorms are rare, but if they occur, about 80% of them produce wind gusts exceeding a threshold of 15 m s-1. Peak wind gusts in a non-thunderstorm days are the highest and the most frequent in January, and are at a minimum during summer. Comparing both types, peak wind gusts during days with a thunderstorm were on average stronger than those without an involved convection. This indicated that convection was an important factor in enhancing the strength of a wind gust. The highest value in our base was 34 m s-1, recorded in Kraków on 8th July 2015 within the occurrence of a severe thunderstorm, while the highest value in a day without a thunderstorm was 33 m s-1, recorded in Łódź on 31st January 2002.
    Źródło:
    Meteorology Hydrology and Water Management. Research and Operational Applications; 2016, 4, 2; 15-21
    2299-3835
    2353-5652
    Pojawia się w:
    Meteorology Hydrology and Water Management. Research and Operational Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-stationary convective drying assisted with microwaves and ultrasound
    Niestacjonarne suszenie konwekcyjne z mikrofalami i ultradźwiękami
    Autorzy:
    Szadzińska, J,
    Łechtańska, J.
    Kroehnke, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073190.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    non-stationary/intermittent drying
    microwaves
    ultrasound
    energy consumption
    quality assessment
    suszenie niestacjonarne/przerywane
    mikrofale
    ultradźwięki
    zużycie energii
    ocena jakościowa
    Opis:
    The aim of research was to examine the effect of convective-intermittent drying assisted with microwaves and ultrasound on drying kinetics, energy consumption and quality of apricots. Fruit were dried in the innovative laboratory hybrid dryer equipped with magnetron and ultrasound generator. The drying and temperature curves, total and specific energy consumption as well as the changes of total color, water activity and rehydration ratio were examined. It was proved that hybrid-intermittent drying reduces the total drying time and energy consumption, and improves the quality of dried product.
    Celem badań była analiza wpływu niestacjonarnego suszenia konwekcyjnego z mikrofalami i ultradźwiękami na kinetykę procesu, zużycie energii i cechy jakościowe moreli. Testy suszenia przeprowadzono w innowacyjnej laboratoryjnej suszarce hybrydowej wyposażonej w magnetron i generator ultradźwięków. Zaprezentowano krzywe suszenia, krzywe temperaturowe, zużycie energii, całkowitą zmianę barwy, aktywność wody oraz współczynnik rehydratacji. Dowiedziono, iż hybrydowe suszenie niestacjonarne skraca czas suszenia, redukuje zużycie energii oraz pozytywnie wpływa na wyróżniki jakości suszonych moreli.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2016, 5; 203--204
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat transfer analysis of non-Newtonian natural convective fluid flow using Homotopy Perturbation and Daftardar-Gejiji & Jafari Methods
    Autorzy:
    Adeleye, Olurotimi
    Yinusa, Ahmed
    Powiązania:
    https://bibliotekanauki.pl/articles/122431.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    non-Newtonian fluid
    natural convection
    vertically infinite plates
    Daftardar-Gejiji & Jafari Method
    DJM
    Homotopy Perturbation Method
    HPM
    ciecz nieniutonowska
    konwekcja naturalna
    metoda Daftardar-Gejiji i Jafari
    metoda perturbacji homotopii
    Opis:
    In this paper, the analytical solution of natural convective heat transfer of a non-Newtonian fluid flow between two vertical infinite plates using the Homotopy Perturbation Method (HPM) and Daftardar-Gejiji & Jafari Method (DJM) is presented. The heat transfer problem of natural convection is observed in many engineering fields including geothermal systems, heat exchangers, petroleum reservoirs, nuclear waste reserves, etc. The problem which is modelled as fully coupled nonlinear ordinary differential equations requires special analytical techniques for its solution. The solutions are obtained using an exact analytical method: the Homotopy Perturbation Method (HPM) and a semi-analytical method: the Daftardar-Gejiji & Jafari Method (DJM). These solutions are compared with solutions obtained from the Runge-Kutta numerical method. The results are in good agreement with the numerical solutions. The effects of the Eckert number, Prandtl number and the non-Newtonian fluid viscosity parameter on the non-dimensional temperature and velocity of the fluid are investigated. The results obtained from the analytical method show that the method can be applied to predict excellent results of the problem and can be used for parametric studies of the problem. From the results, it is shown that when the Prandtl number and the Eckert number are increased, there is an increase in both temperature and fluid flow velocity.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 2; 5-18
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure measurement as a tool to identify moisture transport mechanisms in convective drying of non-shrinking material
    Autorzy:
    Adamska, A.
    Pakowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/105822.pdf
    Data publikacji:
    2018
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    gypsum
    convective drying
    internal pressure
    mass transfer
    gips
    suszenie konwekcyjne
    ciśnienie wewnętrzne
    transport masy
    Opis:
    The drying process is one of the most important stages in the production of building materials. The choice of the drying method affects the chemical and physical properties of the final product. The aim of this research is to measure and analyze the dynamic changes of internal pressure in non-shrinking, porous material during convective drying. In this work the problem will be discussed with special attention to the behavior of rewetted plaster. A commercial gypsum of company PIOTROWICE II (Alpol brand), typically used in construction and decorative plastering was applied. Gypsum was mixed with water in recommended proportion of 0.6 water/gypsum and drying experiments were performed at 50°C. The changes in sample overall mass as well as pressure and material temperature on the midpoint of sample axis were monitored. On the basis of the obtained experimental data of axial pressure, it is possible to perform a more detailed analysis of mass and heat transfer mechanisms than based on the drying kinetics alone. The pressure trends in the sample allow one to determine the moment of transition from the first to the second drying period, without the need to determine the kinetics of drying. The element of novelty consists of using a direct internal pressure measurement to provide information on the variation of the actual drying rate and mass transfer mechanisms.
    Źródło:
    Acta Innovations; 2018, 27; 46-52
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instability of the non-isothermal flow between a rotating and a stationary disks
    Autorzy:
    Tuliszka-Sznitko, E.
    Soong, C. Y.
    Serre, E.
    Bontoux, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967641.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    rotational flow
    stationary disks
    flow instability
    transition flow
    convective/absolute transition
    Opis:
    Both theoretical linear stability analysis and direct numerical simulation are performed to study the transition flow between rotating discs. The paper reports three-dimensional spiral and annular patterns computed with a high-order (spectral) numerical method in the Bodewadt layer of a cylindrical rotor/stator cavity. The characteristic parameters of these boundary layer instabilities are compared with the theoretical results and interpreted in terms of type I and type II generic instabilities. The absolute instability regions are theoretically identified and critical Reynolds numbers of the convective/absolute transition in both layers are given. The absolute or convective nature of the flows is determined by examining the branch-point singularities of the dispersion relation.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 557-566
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of inclined magnetic field and Joule heating in mixed convective peristaltic transport of non-Newtonian fluids
    Autorzy:
    Abbasi, F. M.
    Hayat, T.
    Alsaedi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200788.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mixed convection
    eyring-prandtl fluid
    sutterby fluid
    inclined magnetic field
    konwekcja mieszana
    płyn eyringa-prandtla
    płyn sutterby
    pole magnetyczne
    Opis:
    This article describes the influence of an inclined magnetic field on the mixed convective peristaltic transport of fluid in an inclined channel. Two types of non-Newtonian fluids are considered. The problem formulation is presented for the Eyring-Prandtl and Sutterby fluids. Viscous dissipation and Joule heating in the heat transfer process are retained. The presence of a heat source in the energy equation is ensured. The resulting problems are solved by the perturbation method. The plots for different parameters of interest are given and discussed. Numerical values of a heat transfer rate are given and analyzed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 501-514
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mass transfer effects on an unsteady MHD free convective flow of an incompressible viscous dissipative fluid past an infinite vertical porous plate
    Autorzy:
    Reddy, B. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/264683.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ konwekcyjny
    magnetohydrodynamika
    równanie różniczkowe
    free convection flow
    MHD
    non-linear system
    partial differential equation
    Ritz FEM
    Opis:
    In this paper, a numerical solution of mass transfer effects on an unsteady free convection flow of an incompressible electrically conducting viscous dissipative fluid past an infinite vertical porous plate under the influence of a uniform magnetic field considered normal to the plate has been obtained. The non-dimensional governing equations for this investigation are solved numerically by using the Ritz finite element method. The effects of flow parameters on the velocity, temperature and concentration fields are presented through the graphs and numerical data for the skin-friction, Nusselt and Sherwood numbers are presented in tables and then discussed.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 143-155
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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