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    Wyświetlanie 1-7 z 7
    Tytuł:
    Study on bubble characteristics of flotation column in hematite reverse cationic flotation process
    Autorzy:
    Wang, Weizhi
    Han, Jikang
    Powiązania:
    https://bibliotekanauki.pl/articles/1450070.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    column flotation
    bubble generator
    GE-609
    circularity
    bubble diameter
    bubble Sauter diameter
    Opis:
    In the self-designed flotation column simulation system, the foaming characteristics of the micro-bubble countercurrent contact flotation column used in the hematite cation column flotation process are systematically studied. The objective of this study is to investigate the bubble generation by a bubble generator in the flotation column. The bubble image was obtained by the high-speed camera recorder, and the bubble diameter was calculated and analyzed by image processing software. The distribution characteristics of the bubble size under different aeration conditions and with different reagent concentrations were investigated. The results show that as the aeration increases, the average diameter bubbles increases, the bubble size distribution changes from narrow to wide, and the number of small bubbles decreases. The cationic collector GE-609 can change the bubble shape. As the concentration increases, the bubble shape gradually changes from an irregular shape to a standard spherical shape. When the concentration of GE-609 exceeds 2.5 mg/dm3, the average circularity C of the bubbles in the bubble group stabilizes at 1, and the increase in concentration no longer changes the bubble shape. GE-609 also has an efficient foaming effect, as the concentration increases, the bubble diameter distribution changes significantly, the proportion of small bubbles increases, and the proportion of large bubbles decreases significantly. When the critical concentration is exceeded, the bubble diameter distribution probability density peak width no longer changes significantly. Compared with the two types of alcohol foaming agents, GE-609 produces a bubble Sauter diameter close to that of 2-octanol and slightly lower than terpineol.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 64-75
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Confined fluidised bed porosity in the light of bubbling-bed models
    Autorzy:
    Zabierowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185800.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluidyzacja
    hydrodynamika
    fluidization
    bubbling-bed model
    confined fluidised bed
    hydrodynamics
    bubble diameter
    Opis:
    Based on hydrodynamic data, Kato-Wen and Kunii-Levenspiel bubbling-bed model parameters, supplemented with assumptions characteristic for tested confined fluidised bed, were analysed. The calculated bubble diameters and the bed composition proved essential influence of inter-particle space of packed compacted component onto fluidisation character. The usability of the conducted model analysis was also confirmed. Finally, it can be concluded that Kunii-Levenspiel and Kato-Wen models with characteristic assumptions (for the tested bed) can be applied for calculation of the confined fluidised bed layer porosity. Discrepancies of [epsilon]f value, determined on the basis of the above mentioned bubbling-bed models do not exceed 8% of the error. The model parameters obtained from the matching the model relations to experimental data[epsilon]f = f(uo) allow an analysis of the fluidisation character as well as gas velocity regime and the fluidised bed structural composition identification. A description of the regime of the process in which confined fluidised bed is characterised with an increase of mass and heat transfer rate is also possible using relation (17) derived in the present study.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 3; 431-444
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and measurement of bubble formation and growth in electroflotation processes
    Autorzy:
    Sarkar, S. K.
    Machniewski, P.M.
    Evans, G.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184977.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electroflotatio
    bubble diameter
    detachment
    mass transfer
    CFD modeling
    średnica bańki
    oderwanie
    masa transferu
    modelowanie CFD
    Opis:
    Electroflotation is used in the water treatment industry for the recovery of suspended particles. In this study the bubble formation and release of hydrogen bubbles generated electrolytically from a platinum cathode was investigated. Previously, it was found that both the growth rate and detachment diameter increased with increasing wire diameter. Conversely, current density had little effect on the released bubble size. It was also found that the detached bubbles rapidly increased in volume as they rose through the liquid as a result of decreasing hydrostatic pressure and high levels of dissolved hydrogen gas in the surrounding liquid. The experimental system was computationally modelled using a Lagrangian-Eulerian Discrete Particle approach. It was revealed that desorption of gaseous solutes from the electrolyte solution, other than hydrogen, may have a significant impact on the diameter variation of the formed bubbles. The simulation confirmed that liquid circulation, either forced or induced by the rising bubble plume, influences both the hydrogen supersaturation (concentration) in the neighbourhood of the electrode and the size of the resulting bubbles.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 3; 327-336
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Powierzchnia miedzyfazowa gaz - ciecz w roztworach białka serwatkowego napowietrzanych we współprądowej kolumnie barbotażowej
    Gas-liquid interfacial area in whey protein solutions aerated in a cocurrent bubble column
    Autorzy:
    Hołowacz, I.
    Kawalec-Pietrenko, B.
    Kucharska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2070762.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    białko serwatkowe
    średnica pęcherzy
    stopień zatrzymania gazu
    powierzchnia międzyfazowa gaz-ciecz
    whey protein
    bubble diameter
    gas hold-up
    gas-liquid interfacial area
    Opis:
    Badano własności zawiesiny komórek drożdży Saccharomyces cerevi-siae poddanych dezintegracji w młynie perełkowym. Stopień dezintegracji komórek wyznaczono na podstawie stężenia uwolnionego białka. Własności reologiczne zawiesiny mierzono cylindrycznym re-ometrem rotacyjnym z podwójną szczeliną. Wykazano wpływ energii kinetycznej wypełnienia młyna na nieliniowość przebiegu procesu i zmiany lepkości pozornej zawiesiny.
    Properties of suspension of yeast Saccharomyces cerevisiae cells disintegrated in a bead mill were investigated. A degree of cell disintegration was determined on grounds of released protein concentration. Rheological properties of suspension were measured using a cylindrical rotary double-gap rheometer. An influence of mill packing kinetic energy on process non-linearity and changes of suspension apparent viscosity was proved.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2009, 6; 83-84
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial neural network (ANN) modelling to estimate bubble size from macroscopic image and object features
    Autorzy:
    Vinnett, Luis
    León, Roberto
    Mesa, Diego
    Powiązania:
    https://bibliotekanauki.pl/articles/29552038.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    machine learning
    artificial neural network
    flotation
    bubble size
    Sauter diameter
    Opis:
    Bubble size measurements in aerated systems such as froth flotation cells are critical for controlling gas dispersion. Commonly, bubbles are measured by obtaining representative photographs, which are then analyzed using segmentation and identification software tools. Recent developments have focused on enhancing these segmentation tools. However, the main challenges around complex bubble cluster segmentation remain unresolved, while the tools to tackle these challenges have become increasingly complex and computationally expensive. In this work, we propose an alternative solution, circumventing the need for image segmentation and bubble identification. An Artificial Neural Network (ANN) was trained to estimate the Sauter mean bubble size (D32) based on macroscopic image features obtained with simple and inexpensive image analysis. The results showed excellent prediction accuracy, with a correlation coefficient, R, over 0.998 in the testing stage, and without bias in its error distribution. This machine learning tool paves the way for robust and fast estimation of bubble size under complex bubble images, without the need of image segmentation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 185759
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bubbling properties of frothers and collectors mix system
    Autorzy:
    Batjargal, Khandjamts
    Guven, Onur
    Ozdemir, Orhan
    Karakashev, Stoyan I.
    Grozev, Nikolay A.
    Boylu, Feridun
    Çelik, Mehmet Sabri
    Powiązania:
    https://bibliotekanauki.pl/articles/2146880.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    critical coalescence concentration (CCC)
    Sauter diameter (d32)
    bubble size distribution (BSD)
    Opis:
    This paper studies the effect of the type and concentration of selected frothers and collectors mix system on the bubble sizes (Sauter mean diameter, SMD) of bubbling flow produced in a micro flotation cell and the determination of bubble size distribution (BSD). The usage of dodecyl amine hydrochloride (DAH) collector on the critical coalescence concentration of commercial frothers PPG200, PPG400, and PPG600 was investigated in detail. The results of these studies showed that the usage of DAH decreased the CCC of these frothers. Each frother + collector mixing system exhibited its unique ability in preventing coalescence of the bubbles in the order of PPG200 < PPG400 < PPG600. The factorial experiments established that the type of the frother, collector, and their concentration had a major effect on the size of the bubbles. The BSD in the presence of PPG600 + DAH mix system resulted in a little bit wider BSD which indicated the effect of frother type in mixed systems.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152890
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wpływu wirującego pola magnetycznego na układ dyspersyjny gaz - ciecz
    Experimental study of gas - liquid disperse system exposed to rotating magnetic field
    Autorzy:
    Rakoczy, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2070667.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    rozkład średnicy pęcherzy
    średnica Sautera
    wirujące pole magnetyczne
    bubble size distributions
    Sauter diameter
    rotating magnetic field
    Opis:
    W pracy przedstawiono wyniki badań układów gaz — ciecz w nowym typie urządzenia wykorzystującym wirujące pole magnetyczne. Przeanalizowano wpływ parametrów fizycznych fazy ciągłej oraz parametrów operacyjnych na stan układu dyspersyjnego. Analizę oparto na przedstawieniu zmian średniej średnicy Sautera w zależności od bezwymiarowych liczb Mortona oraz Hartmana.
    Gas - liquid systems under the action of rotating magnetic field in a novel type column were studied. In this contribution an influence of operating conditions and physical properties of liquid continuous phase on dispersed phase are discussed. Specifically, the Sauter mean bubble diameter is determined as a function of the dimensionless Morion and Hartman numbers.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2009, 6; 160-161
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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