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Wyszukujesz frazę "particle shape" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influence of the sand particle shape on particle size distribution measured by laser diffraction method
    Autorzy:
    Polakowski, C.
    Sochan, A.
    Bieganowski, A.
    Ryzak, M.
    Foldenyi, R.
    Toth, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/25877.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    sand
    particle shape
    particle size distribution
    laser diffraction
    Opis:
    The aim of this paper was to show how the shape of sand particles affects the results of particle size distribution obtained by the laser diffraction method. On the basis of the results obtained one can conclude: the shape of the investigated particles influences particle size distribution obtained by the laser diffraction method. This phenomenon occurs in the sand fraction, as shown in our investigation. The importance of this effect depends on the type of the measured material and on the aim of the investigations. For most researchers in soil science and sedimentology who investigate sand fractions, this impact can be negligible. Further investigations with other soil and sediment fractions are needed.
    Źródło:
    International Agrophysics; 2014, 28, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on the particle size and shape of iron ore pellet feed using ball mill and HPGR grinding methods
    Autorzy:
    Abazarpoor, A.
    Halali, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/109944.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    HPGR
    ball mill
    particle size
    particle shape
    image analysis
    SEM
    Opis:
    An effect of a grinding method, that is ball mill and high pressure grinding rolls (HPGR), on the particle size, specific surface area and particle shape of an iron ore concentrate was studied. The particle size distribution was meticulously examined by sieve, laser and image analyses. To measure the specific surface area of particles, Brunauer-Emmett-Teller (BET) and Blaine methods were used. It was found that for samples having equal Blaine specific surface areas numbers, the amount of fine particles produced in HPGR was higher than that produced in a ball mill. A higher surface area was observed from HPGR treatment in comparison to ball mill grinding, provided by a higher porosity, cracks, roughness and new surfaces. A shape factor of particles was determined using the circularity, roughness, and aspect ratio. It was also observed that HPGR produced particles that were more elongated, less circular and rougher than those processed by the ball mill.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 908-919
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of ultrasonic treatment on the particle size, shape and ash content of fine coal
    Autorzy:
    Mao, Yuqiang
    Xie, Guangyuan
    Liang, Long
    Xia, Wencheng
    Peng, Yaoli
    Powiązania:
    https://bibliotekanauki.pl/articles/109544.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ultrasonic time
    fine coal
    particle size
    particle shape
    ash content
    Opis:
    The effects of ultrasonic treatment of different time on the particle size, morphology, ash content, and elementary composition of fine coal particles (74-45 μm) were investigated in this paper. The size reduction of coal particles induced by ultrasonic treatment was analyzed through the Focused Beam Reflectance Measurement (FBRM) and the variation of mechanical pulverization mechanism was discussed. The Scanning Electron Microscope (SEM) measurements showed that the sharp corners on coal particles was ground to round ones after ultrasonic treatment. This may be not conducive to coal flotation. It was also found that the ash content of 74-45 μm coal particles was increased gradually with the increase of ultrasonic time, while the ash content of -45 μm fraction was decreased. This was supported by the EDS measurements, indicating that the carbon content on the surfaces of 74-45 μm coal was reduced while the aluminium and silicon contents were increased after ultrasonic treatment.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 3; 679-688
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Particle shape effect on macroscopic behaviour of underground structures: numerical and experimental study
    Autorzy:
    Szarf, K.
    Combe, G.
    Villard, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/178734.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    discrete element method
    particle shape
    underground pipe
    digital image correlation
    Opis:
    The mechanical performance of underground flexible structures such as buried pipes or culverts made of plastics depend not only on the properties of the structure, but also on the material surrounding it. Flexible drains can deflect by 30% with the joints staying tight, or even invert. Large deformations of the structure are difficult to model in the framework of Finite Element Method, but straightforward in Discrete Element Methods. Moreover, Discrete Element approach is able to provide information about the grain–grain and grain–structure interactions at the microscale. This paper presents numerical and experimental investigations of flexible buried pipe behaviour with focus placed on load transfer above the buried structure. Numerical modeling was able to reproduce the experimental results. Load repartition was observed, being affected by a number of factors such as particle shape, pipe friction and pipe stiffness.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 3; 67-74
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The accurate algorithm of new surface area of single particle comminution, incorporating particle shape and roughness
    Autorzy:
    Guo, Qing
    Zhou, Qiang
    Pan, Yongtai
    Zhu, Changyong
    Wei, Yinghua
    Powiązania:
    https://bibliotekanauki.pl/articles/1448900.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    crushing
    surface area
    particle shape
    surface fractal dimension
    calculation model
    energy efficiency
    Opis:
    Energy efficiency can be obtained by measuring accurate new surface energy in the crushing process. For the calculation of new surface energy, most researchers only pay attention to particle size distribution and ignore the influence of particle shape and roughness on the surface area. In this paper, the image processing technology was used to calculate the shape parameters and surface fractal dimension of the crushed granite sample. According to the different combinations of particle shape and roughness, the new surface area corresponding to the four basic models was calculated. For the surface area of a single particle, the calculation result of the rough model considering the surface fractal dimension is higher than that of the smooth model. Moreover, the ratio of the calculation results of the rough model and the smooth model increases significantly as the particle size increases. For 0.1 mm particles, the area ratio of the two models is 8, but for 25 mm particles, the area ratio reaches 130. In contrast, the particle shape is a secondary factor that affects the surface area calculation. The ellipsoidal model considering the particle shape has a surface area 30% larger than the spherical model. If the roughness and particle shape are considered when calculating the surface area, the energy efficiency of crushing is higher.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 259-272
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie metody DEM do badania wpływu kształtu ziaren na charakter wysypu materiału rozdrobnionego podczas opróżniania silosu
    Application of DEM method for the investigation of particle shape effect on a type of powder bed flow during silo discharge process
    Autorzy:
    Chutkowski, M.
    Zapała, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073052.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    opróżnianie silosu
    metoda elementów dyskretnych (DEM)
    materiały rozdrobnione
    porowatość lokalna
    kształt cząstek
    silo discharge
    DEM
    particulate materials
    local porosity
    particle shape
    Opis:
    W oparciu o metodę DEM przeprowadzono symulacje komputerowe procesu opróżniania modelowego silosu, które pozwoliły zbadać wpływ kształtu ziaren trzech materiałów roślinnych na profile porowatości lokalnej w charakterystycznych punktach. Uzyskane w wyniku badań zróżnicowane rodzaje wysypu pozwoliły na zaproponowanie bezwymiarowego kryterium pomocnego w ilościowej ocenie charakteru wysypu ziaren, na podstawie przebiegu profili porowatości lokalnych podczas wysypu.
    On the basis of DEM method computer simulations of silo discharge process were performed and the effect of particle shape for three plant materials on local porosity profiles in selected characteristic regions of a model silo were investigated. The obtained various types of powder motion allowed the formulation of new dimensionless criterion for a quantitative assessment of powder flow type to be proposed on the basis of local porosity course during the model silo discharge.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2015, 3; 71--73
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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