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Wyszukujesz frazę "silo" wg kryterium: Temat


Tytuł:
Silo failures: Why do they happen?
Autorzy:
Carson, J. W.
Holmes, T.
Tematy:
silo
structural failure
buckling
silo design
silo construction
silo operation
silo maimtenance
Pokaż więcej
Wydawca:
Politechnika Gdańska
Powiązania:
https://bibliotekanauki.pl/articles/1955783.pdf  Link otwiera się w nowym oknie
Opis:
Silos and bins fail with a frequency that is much higher than that of almost any other industrial equipment. Sometimes the failure involves only distortion or deformation that, while unsightly, does not pose a safety or occupational hazard. In other cases, failure involves complete collapse of the structure with accompanying loss of use and even loss of life. Three major causes of silo failure are identified: design errors, construction errors, and utilization errors. Numerous case histories are used to illustrate common mistakes, limits of design, and lessons learned.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of the "silo quaking" problems in bins of various geometrical shapes and flow patterns
Autorzy:
Roberts, A.
Tematy:
gravity flow
flow pulsations
silo quaking
silo wall loads
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Wydawca:
Politechnika Gdańska
Powiązania:
https://bibliotekanauki.pl/articles/1955767.pdf  Link otwiera się w nowym oknie
Opis:
The paper reviews the characteristics of pulsating or cyclic flow of bulk solids during gravity discharge in bins and silos. The dynamic load phenomenon is often referred to as "silo quaking" and is known to occur in silos of various geometrical shapes, operating under different flow patterns. Examples include mass-flow, funnel-flow, expanded-flow, multi-outlet bins and bins operating under intermediate-flow. While silo quaking is often associated with tall bins, depending on the flow pattern, the problem can also be experienced in bins of squat proportions. The period of pulsations during flow is influenced by various factors, such as, particle size and size distribution, silo wall material and wall roughness, internal friction, moisture content and discharge flow rate. Of particular relevance is the influence of slip-stick effects during shear flow, and velocity at critical sections in the silo during discharge. The paper presents an overview of silo quaking with case studies to illustrate the range of problems that can occur.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The flow of rape seed in a silo equipped with a discharge device
Autorzy:
Kamiński, M.
Antonowicz, R.
Tematy:
silo
anti-dynamic tube
flow rate
pressure distribution
damaged silo
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Wydawca:
Politechnika Gdańska
Powiązania:
https://bibliotekanauki.pl/articles/1955775.pdf  Link otwiera się w nowym oknie
Opis:
The paper contains a review of experiments with rape seed in a model silo with a semicircular flat bottom equipped with a low-height discharge device. Observations of flow patterns were made during filling and discharging through the transparent front wall of the model silo. Measurement of wall normal pressures and discharge flow rate were also made. A properly designed discharging device can eliminate a pressure peak which is usual for the transition point (dynamic overpressure) in mass flow silos. Experiments have shown that a low-height discharge device can be applied to reduce the pressure increase during discharging damaged silos.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modeling of Wall Pressure in Silo with and Without Insert
Autorzy:
Askif, Frzat
Hammadeh, Hala
Ubysz, Andrzej
Maj, Marek
Tematy:
numerical modeling
silo
silo model
flow pressure
insert
wall pressure
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/1845157.pdf  Link otwiera się w nowym oknie
Opis:
This paper presents a methodology based on the finite element method to simulate the flow of granular materials. Moreover, it allows proper estimation of dynamic pressure during silo discharge since this subject is still under discussion, especially for designing silos with an insert (an input element). A 2-D simulation of the discharge process of a cylindrical silo with cone and a central discharging orifice was performed. Two cases were studied, with and without using insert in silo. Numerical analysis was carried out with the help of the uncoupled arbitrary Lagrangian–Eulerian (ALE) approach. The resulting dynamic pressure distribution on the silo wall for each of the two cases was inferred numerically. The resulting values of pressure were compared with the results of the experimental study on a cylindrical metal silo to demonstrate the accuracy of the numerical model in determining the dynamic wall pressure, especially in the case of using an insert in silo during discharge.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of silo centrifuge testing
Autorzy:
Grossstück, M.
Schwedes, J.
Tematy:
silo design
moist bulk solids
silo-centrifuge
scale-up
model tests
Pokaż więcej
Wydawca:
Politechnika Gdańska
Powiązania:
https://bibliotekanauki.pl/articles/1955776.pdf  Link otwiera się w nowym oknie
Opis:
Common problems of industrial silo design can be solved with the use of the Jenike method. The Jenike method is an established procedure to investigate the critical outlet dimensions of a silo and the flow profile. However, in some cases the Jenike method is assumed to lead to overdesign, especially when silo design is calculated for highly dispersed bulk solids in the nano range or if the bulk solid contains moisture. Another way to determine the critical outlet dimension of a silo is a model test. We then have to consider the boundary conditions, i.e. the particle size, and a possible size reduction of the model silo, which is only possible in a centrifugal field using cohesive bulk solids. In this work, results of experiments in a silo centrifuge regarding scale-up are presented. The experiments have been performed to investigate the critical outlet dimension for a silo for very fine and moist bulk solids.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silosy z cienkich blach - wybrane zagadnienia badawcze i projektowe
Silos made of thin metal sheet - selected testing and design issues
Autorzy:
Antonowicz, R.
Klimek, A.
Tematy:
silos stalowy
silos cylindryczny
silos cienkościenny
projektowanie
połączenie śrubowe
nośność złącza
steel silo
cylindrical silo
thin-walled silo
designing
screw joint
joint load bearing capacity
Pokaż więcej
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Powiązania:
https://bibliotekanauki.pl/articles/163231.pdf  Link otwiera się w nowym oknie
Opis:
Przedstawiono problematykę związaną z projektowaniem cylindrycznych silosów zbożowych z cienkich blach płaskich łączonych na śruby. Zgodnie z obowiązującymi normami i zaleceniami, sztywność i wytrzymałość połączeń elementów cienkościennych należy wyznaczać doświadczalnie. Podano przykłady obliczeń i rozwiązań konstrukcyjnych niewielkich silosów i wyniki badań doświadczalnych połączeń śrubowych cienkich blach. Zbadanie nośności, sztywności i odkształcalności typowych konfiguracji połączeń pozwoliło na ich zoptymalizowanie pod względem liczby i rozmieszczenia łączników.
This article presents issues relating to the design of cylindrical grain silos made of thin flat metal sheets connected with screws. According to current standards and recommendations, the rigidity and strength of the connections between thin-walled elements must be determined experimentally. This article gives examples of calculations and design solutions for small silos, and the results of experimental tests on screw connections of thin sheets. Testing of the load capacity, rigidity and deformability of typical configurations of connections has made it possible to optimize them in terms of the number and positioning of joints.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FE-simulations of rapid silo flow with a polar elasto-plastic constitutive model
Autorzy:
Tejchman, J.
Tematy:
finite element simulations
polar elasto-plastic constitutive model
silo flow
numerical modelling
model silo
convergent smooth walls
Pokaż więcej
Wydawca:
Politechnika Gdańska
Powiązania:
https://bibliotekanauki.pl/articles/1953957.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents results on numerical modelling of rapid flow of granular materials in a model silo with convergent smooth walls. The calculations were performed with a finite element method based on a polar elasto-plastic constitutive relation by Muhlhaus (1995). The relation differs from the conventional theory of plasticity by the presence of Cosserat rotations and couple stresses using a mean grain diameter as a characteristic length. The characteristic length causes that numerical results do not depend upon the mesh discretisation. The model tests on rapid silo flow of glass beads performed by Renner in a glass hopper with a large wall inclination from the bottom were numerically simulated. The plane strain FE-calculations were performed by taking into account inertial forces and linear viscous damping. A satisfactory agreement between numerical and experimental results was obtained. Advantages and limitations of a continuum approach for simulations of rapid silo flow were outlined.
Dostawca treści:
Biblioteka Nauki
Artykuł

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