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    Wyświetlanie 1-8 z 8
    Tytuł:
    Numerical Analysis of The Effect of Hydrodynamics and Operating Conditions on Biodiesel Synthesis in a Rotor-Stator Spinning Disk Reactor
    Autorzy:
    Wen, Z.
    Petera, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/184848.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biodiesel synthesis
    ANSYS Fluent
    rotor-stator reactor
    backflow
    operating conditions
    biodiesel
    Opis:
    A rotor-stator spinning disk reactor for intensified biodiesel synthesis is described and numerically simulated in the present research. The reactor consists of two flat disks, located coaxially and parallel to each other with a gap ranging from 0.1 mm to 0.2 mm between the disks. The upper disk is located on a rotating shaft while the lower disk is stationary. The feed liquids, triglycerides (TG) and methanol are injected into the reactor from centres of rotating disk and stationary disk, respectively. Fluid hydrodynamics in the reactor for synthesis of biodiesel from TG and methanol in the presence of a sodium hydroxide catalyst are simulated, using convection-diffusion-reaction multicomponent transport model with the CFD software ANSYS©Fluent v. 13.0. Effect of operating conditions on TG conversion is particularly investigated. Simulation results indicate that there is occurrence of back flow close to the stator at the outlet zone. Small gap size and fast rotational speed generally help to intensify mixing among reagents, and consequently enhance TG conversion. However, increasing rotational speed of spinning disk leads to more backflow, which decreases TG conversion. Large flow rate of TG at inlet is not recommended as well because of the short mean residence time of reactants inside the reactor.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 2; 265-281
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD Numerical Simulation of Biodiesel Synthesis in a Spinning Disc Reactor
    Autorzy:
    Wen, Z.
    Petera, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/184923.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spinning disc
    biodiesel synthesis
    ANSYS Fluent
    numerical simulation
    TG conversion
    symulacja numeryczna
    konwersja TG
    Opis:
    In this paper a two-disc spinning disc reactor for intensified biodiesel synthesis is described and numerically simulated. The reactor consists of two flat discs, located coaxially and parallel to each other with a gap of 0.2 mm between the discs. The upper disc is located on a rotating shaft while the lower disc is stationary. The feed liquids, triglycerides (TG) and methanol are introduced coaxially along the centre line of rotating disc and stationary disc. Fluid hydrodynamics in the reactor for synthesis of biodiesel from TG and methanol in the presence of a sodium hydroxide catalyst are simulated, using convection-diffusion-reaction species transport model by the CFD software ANSYS©Fluent v. 13.0. The effect of the upper disc’s spinning speed is evaluated. The results show that the rotational speed increase causes an increase of TG conversion despite the fact that the residence time decreases. Compared to data obtained from adequate experiments, the model shows a satisfactory agreement.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 1; 21-37
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The problem of the Last Glaciation extent in Central Poland
    Autorzy:
    Petera, J.
    Forysiak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058818.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    eastern Wielkopolska Lowland
    last glaciation
    maximum extent
    extraglacial deposits
    Opis:
    The maximum extent of the last ice sheet near Konin, Koło and Turek has been controversial. Investigations carried out in the Warta River has shed light on this problem. The Krzyżówki, Koźmin and Smulsko sites show fluvial deposits laid down in an extraglacial, periglacial environment during the Vistulian Glaciation. The northernmost site, Krzyżówki, shows an influence of proglacial waters, expressed by the supply of fluvioglacial material. The findings suggest that the last ice sheet did not overpass the Berlin-Warsaw Pradolina east of Konin and thus did not enter the Turek Plateau or the Uniejów Basin.
    Źródło:
    Geological Quarterly; 2003, 47, 4; 357-366
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of numerical modelling to scaling-up of electrically induced extraction from an organic mixture using an ionic liquid
    Autorzy:
    Kamiński, K.
    Weatherley, L.R.
    Petera, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/185391.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    scaling-up
    finite element analysis
    liquid-liquid extraction
    ionic liquids
    electrospray
    skalowanie
    analiza metodą elementów skończonych
    ekstrakcja ciecz-ciecz
    ciecze jonowe
    elektrorozpylanie
    Opis:
    Liquid-liquid extraction provides an environmentally friendly process as an alternative to azeotropic distillation, pervaporation and reverse osmosis because these techniques require the use of large amounts of energy, may involve volatile organic compounds, and operation at high pressureIonic liquids (ILs) continue to gain wide recognition as potential environmentally friendly solvents due to their unique properties. However due to their current high cost, their use in industry is seriously limited without an efficient methodology for recovery and recycle. In this paper we describe an innovative methodology for a liquid-liquid extraction process based on an electrically induced emulsion of an ionic liquid as the extracting solvent dispersed in an organic mixture. This offers a most efficient exploitation of the solvent. On the other hand we present our own design of a pilot (semi-industrial) scale extractor based on this methodology and which demonstrates effective recovery of the ionic liquid. In order to achieve this goal we used a numerical modelling tool implemented using our own simulation software based on the finite element method. We also used our original previous experience with generating and investigating liquid-liquid electrosprays using phase Doppler anemometry. Finally we present recommendations for contactor geometry and for the preferred operating conditions for the extractor.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 1; 133-148
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extrusion of food pastes from a pipeline by means of compressed air
    Wytlaczanie past spozywczych z przewodow
    Autorzy:
    Dziubinski, M.
    Pruska-Kedzior, A.
    Petera, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371781.pdf
    Data publikacji:
    1994
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    wytlaczanie
    zywnosc
    inzynieria zywnosci
    pasty spozywcze
    operacje jednostkowe
    Opis:
    Two methods for cleaning of a pipeline from food pastes are discussed. These are: an indirect method which includes extrusion of a pellet of elastomeric materiaL and a direct method which is a special case of a two-phase flow of paste and gas in pipe. A mathematical model of flow and a method for determination of the initial gas parameters, i.e. volume and pressure which enable the extrusion of pastes from pipeline, while preserving its technological and sensory properties, are proposed.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 1994, 03, 4; 135-147
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic characterisation of catalysts for methanol synthesis
    Autorzy:
    Ledakowicz, S.
    Nowicki, L.
    Petera, J.
    Nizioł, J.
    Kowalik, P.
    Gołębiowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185511.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    methanol synthesis
    copper base catalyst
    kinetics
    Zr and Mg doping
    synteza metanolu
    katalizator na bazie miedzi
    kinetyka
    Opis:
    The results of activity studies of four catalysts in methanol synthesis have been presented. A standard industrial catalyst TMC-3/1 was compared with two methanol catalysts promoted by the addition of magnesium and one promoted by zirconium. The kinetic analysis of the experimental results shows that the Cu/Zn/Al/Mg/1 catalyst was the least active. Although TMC-3/1 and Cu/Zn/Al/Mg/2 catalysts were characterised by a higher activity, the most active catalyst system was Cu/Zn/Al/Zr. The activity calculated for zirconium doped catalyst under operating conditions was approximately 30% higher that of TMC-3/1catalyst. The experimental data were used to identify the rate equations of two types – one purely empirical power rate equation and the other one - the Vanden Bussche & Froment kinetic model of methanol synthesis. The Cu/ZnO/Al2O3catalyst modified with zirconium has the highest application potential in methanol synthesis.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 4; 497-506
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeogeographical significance of the Eemian biogenic sediments at Bór site (Warta River valley, Central Poland)
    Autorzy:
    Petera-Zganiacz, J.
    Borówka, R.K.
    Forysiak, J.
    Miotk-Szpiganowicz, G.
    Pawłowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060307.pdf
    Data publikacji:
    2013
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    gyttja
    palynology
    cladocera
    geochemistry
    Warta River valley deposits
    Opis:
    An investigated area is located in the middle reach of the WartaRiver valley. During drillings in the Bór site organic deposits such as detritous calcareous gyttja and calcareous detritous gyttja has been documented in a depth between 14,9 and 16,6 m. The organic deposits are covered by mineral, mostly sandy deposits. The accumulation took place in the small lake formed as an abandoned channel. Palynological analysis led to conclusion that biogenic accumulation began at the end of Wartanian and took place at least to the Eemian Interglacial optimum. Results of palynological, Cladocera and geochemical analysis inform about water level changes and increasing of trophy status of the reservoir. Presence of Mesozoic substratum very close to the palaeolake bottom influenced significantly chemical features of the organic deposits. As Eemian organic deposits are uncommon in the Warta River valley, the Bór site seems important for palaeogeographical reconstructions of the Warta River valley during Eemian Interglacial.
    Źródło:
    Geological Quarterly; 2013, 57, 4; 687--700
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties and dimensional stability of 12 500-year-old subfossil pine wood
    Autorzy:
    Fejfer, M.
    Zborowska, M.
    Adamek, O.
    Dzieduszynska, D.
    Kittel, P.
    Petera-Zganiacz, J.
    Twardy, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/52869.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    wood property
    dimensional stabilization
    subfossil
    pine wood
    Scotch pine
    Pinus sylvestris
    chemical composition
    physical property
    conservation
    hygroscopic property
    Opis:
    At the Koźmin Las site, in Central Poland, in the middle section of the Warta River valley, a series of well-preserved tree trunks and in situ stumps, as well as organic deposits, have been found. The tree remains are dated back to the period between 13,000–12,600 cal BP, i.e. to the Alleröd/Younger Dryas transition. The forest consisted predominantly of pines (Pinus sylvestris L.) of a maximum age of approx. 140 years and an average age of 68 years, and the river valley floor was overgrown. The forest was destroyed ca. 12,600 cal BP by deteriorating hydrological conditions or a sudden catastrophic event. The aim of the study was to assess the degree of degradation in terms of selected macroscopic, physical and chemical properties of a subfossil pine log. On this basis, a conservation process was developed,using aqueous solutions of polyethylene glycols (PEG) with varying concentrations of low- and high-molecular polymers. Treated and dried samples were comparedin terms of their tangential and radial dimensional stability, as well as their hygroscopic properties.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 193
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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