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    Wyświetlanie 1-7 z 7
    Tytuł:
    Experimental investigation into influence of oil-in-water emulsions flow on permeability of porous bed
    Autorzy:
    Błaszczyk, Mariola
    Sęk, Jerzy
    Przybysz, Łukasz
    Pacholski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1178549.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    emulsions
    multiphase flow
    oil-in-water
    porous bed permeability
    Opis:
    Emulsions are interesting dispersed systems that are necessary for a number of technological processes. Their flow through porous structures have many applications in the field of chemical engineering. Enhanced Oil Recovery (EOR) techniques, soil remediation and various treatment methods of oily wastewater are good examples of emulsion flow in porous structure. The phenomenon of dispersed system flow through porous media is not easy to describe, mainly because of rheological behavior of emulsions and porous structure properties. During two phase flow of oil and water through porous bed it is possible to observe the interception of oil to porous structure, as well as filtration of oil in pores. In this study, we tried to examine the influence of the fraction size as well as migration process history on permeability of porous bed.
    Źródło:
    World Scientific News; 2017, 70, 2; 241-251
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of back propagation neural network to predict the thermal performance of porous bed solar air heater
    Autorzy:
    Ghritlahre, Harish Kumar
    Prasad, Radha Krishna
    Powiązania:
    https://bibliotekanauki.pl/articles/240570.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solar air heater
    porous bed
    thermal performance
    artificial neural network
    Levenberg-Marquardt algorithm
    Opis:
    The objective of present work is to predict the thermal performance of wire screen porous bed solar air heater using artificial neural network (ANN) technique. This paper also describes the experimental study of porous bed solar air heaters (SAH). Analysis has been performed for two types of porous bed solar air heaters: unidirectional flow and cross flow. The actual experimental data for thermal efficiency of these solar air heaters have been used for developing ANN model and trained with Levenberg-Marquardt (LM) learning algorithm. For an optimal topology the number of neurons in hidden layer is found thirteen (LM-13).The actual experimental values of thermal efficiency of porous bed solar air heaters have been compared with the ANN predicted values. The value of coefficient of determination of proposed network is found as 0.9994 and 0.9964 for unidirectional flow and cross flow types of collector respectively at LM-13. For unidirectional flow SAH, the values of root mean square error, mean absolute error and mean relative percentage error are found to be 0.16359, 0.104235 and 0.24676 respectively, whereas, for cross flow SAH, these values are 0.27693, 0.03428, and 0.36213 respectively. It is concluded that the ANN can be used as an appropriate method for the prediction of thermal performance of porous bed solar air heaters.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 4; 103-128
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fixed Bed System Packed with Porous Materials for Removal of Organic Dye from Wastewater
    Autorzy:
    Cho, Young-Sang
    Sung, Sohyeon
    Powiązania:
    https://bibliotekanauki.pl/articles/2203706.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porous particles
    photocatalyst
    adsorbent
    fixed bed
    Opis:
    Fixed beds were adopted for removal of organic dye from water by photocatalytic decomposition or adsorption. To this end, macroporous titania or silica micro-particles were synthesized from emulsions as micro-reactors and packed in the bed. During feeding aqueous methylene blue solution, UV light was irradiated for generation of active radicals for removal of dye by photocatalytic decomposition. Porous silica particles were also used as adsorbents in the bed for continuous adsorption of organic dye. For regeneration of the porous titania or silica particles, rinsing with fresh water was carried out before repeated cycles.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 51--56
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fuzzy logic approach in the analysis of heat transfer in a porous sorbent bed of the adsorption chiller
    Autorzy:
    Grabowska, K.
    Krzywański, J.
    Sztekler, K.
    Kalawa, W.
    Nowak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/297943.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    adsorption chiller
    porous media
    fuzzy logic
    thermal conductivity
    coated adsorption bed
    Opis:
    Thermal conductivity in the boundary layer of heat exchange surface is the crucial parameter of adsorption process efficiency which occurs in the adsorption bed. In order to improve heat transfer conditions in the adsorption chiller, novel constructions of adsorption beds are currently investigated. The porous structure of the sorbent layer causes low thermal conductivity in the adsorption bed. One of the methods to improve heat transfer conditions is a modification of porous media bed structure with glue which is characterized with higher thermal conductivity. The optimum parameters of sorbents and glues to build the novel coated construction, in terms of improving the chiller Coefficient of Performance (COP) were defined in (Grabowska et al. 2018a). The paper implements fuzzy logic approach for predicting thermal conductivity of modified porous media layers. The developed model allows determination of the sorbent layer thermal conductivity based on various input parameters: arithmetic average of particle distribution d, density ρ and thermal diffusivity k. The data from empirical research was used to build up the model by fuzzy logic methods.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(4); 281-290
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the process of heating of a bed of steel bars
    Numeryczna analiza procesu nagrzewania złoża prętów stalowych
    Autorzy:
    Musiał, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/350896.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    proces nagrzewania
    złoża prętów stalowych
    heating of porous charge
    bed of bars
    Opis:
    The article describes the computation of the time of heating of a bed of bars in the heat treatment process. The charge was subjected to under-annealing, which is used in industry, e.g., to facilitate sawing of bars or billets into a sections intended for hot forging. The beds under examination were regarded as solid elements, which was possible thanks to the knowledge of the effective thermal conductivity, ?. The value of this quantity for the temperature range under consideration was determined based on the author’s original investigation. During heating of a bundle of bars at a constant heating medium temperature, a temperature difference occurs on the charge cross-section, which is significantly greater than that provided for by the technology. It is therefore essential to carry out a second soaking stage in order to achieve the cross-sectional temperature difference at a level of 20°C. The computation of soaking was conducted for the assumed conditions of a constant temperature on the charge surface and the parabolic distribution of temperature on the cross-section.
    W artykule przedstawiono obliczenia czasu nagrzewania złoża prętów w procesie obróbki cieplnej. Wsad poddano wyżarzaniu niezupełnemu, które stosuje się w przemyśle np. w celu ułatwienia ciecia prętów lub kesów na piłach, na odcinki przeznaczone do kucia na gorąco. Analizowane złoża rozpatrywano jako element lity, co było możliwe dzięki znajomości efektywnego współczynnika przewodzenia ciepła. Wartość tego współczynnika dla rozpatrywanego zakresu temperatury określono na podstawie badań własnych autora. Podczas nagrzewania wiązki prętów w stałej temperaturze ośrodka nagrzewającego na przekroju wsadu pojawia sie znaczna różnica temperatur niż zakłada to technologia. W związku z tym niezbędne jest przeprowadzenie drugiego etapu wygrzewania celem uzyskania na przekroju wsadu różnicy temperatur na poziomie 20_C. Obliczenia wygrzewania przeprowadzono dla założonych warunków stałej temperatury na powierzchni wsadu i parabolicznego rozkładu temperatury na przekroju.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 1; 63-66
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the occurrence of natural convection in a bed of bars in vertical temperature gradient conditions
    Autorzy:
    Wyczółkowski, R.
    Musiał, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/239971.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    natural convection
    bed of bars
    porous material
    konwekcja naturalna
    złoża prętów
    materiały porowate
    Opis:
    The reason for undertaking this study was to determine the possible involvement of natural convection in the global heat transfer, that occurs in the heated steel rods bed. This problem is related to the setting of the effective thermal conductivity of the bars bed. This value is one of the boundary conditions for heating modeling of steel rods bundles during heat treatment. The aim of this study was to determine for which geometry of the bed bars, there will be no free convection. To analyze the problem the Rayleigh criterion was used. It was assumed that for the value of the number Ra < 1700 convection in the bed bars does not occur. For analysis, the results of measurements of the temperature distribution in the unidirectionally heated beds of bars were used. It has been shown, that for obtained, during the test, differences of temperature between the surfaces of adjacent rods, convection can occur only when the diameter of the rod exceeds 18 mm.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 1; 71-83
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of heat transfer in a packed bed column
    Autorzy:
    Pianko-Oprych, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779829.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    kolumny z pełnym wypełnieniem
    porowate modele mediów
    wymiana ciepła
    obliczeniowa dynamika płynów
    packed bed column
    porous media model
    heat transfer
    computational fluid dynamics (CFD)
    Opis:
    The CFD modelling of heat transfer in the packed bed column in the laminar and turbulent fl ow regimes has been presented. Three numerical grids with different densities were generated for the packed bed column. The modelling was performed with the use of the Porous Media Model for treating the flow inside a porous structure. The standard k-ε model along with the logarithmic wall functions for the turbulent flow range was used. The infl uence of the mesh size on the accuracy of the fluid flow was studied. Both radial and axial direction temperature distributions have been compared with the experimental data1 and the values calculated from a 2DADPF model. A good agreement between the experimental and the predicted values of the pressure drop, temperature distributions and heat transfer coefficient was obtained.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 4; 34-41
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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