Temat: mass flow - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Analytical analysis of cavitating flow in Venturi tube on the basis of experimental data
Autorzy:: Niedźwiedzka, A.
Sobieski, W.
Tematy:: cavitation
Venturi tube
mass flow rate; Pokaż więcej
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie
Powiązania:: https://bibliotekanauki.pl/articles/298422.pdf Link otwiera się w nowym oknie
Opis:: The content of this article is a direct continuation of the prior experimental works on the topic of cloud cavitation in Venturis. The results of the experimental tests were used to create a set of characteristics for three types of Venturis. The article has two aims: 1) verification of the similarity between the characteristics obtained and reported in the literature, 2) verification of the range of the obtained characteristics with respect to parallel diagrams. Both aims were achieved, which confirms that the quality of the prior results of the experimental measurements is at least sufficient to realize the main objective of the whole project: creation of numerical models of cavitating flow in Venturis. The literature overview showed that the issue has been not solved until today, even at the qualitative level. This reason was the motivation for the undertaken research, including contents of the article.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Effect of Thermal Transformations on the Melt Mass-flow Rate and the Melt Volume-flow Rate of Abs
Autorzy:: Chełstowski, Karol
Mazur, Piotr
Wydawca:: Aeternitas Publishing House
Opis:: Stanisław Borkowski
The melt mass-flow rate and the melt volume-flow rate determine the processing conditions for thermosetting plastics, and in recycled materials, they are indicators of the susceptibility of polymers to recycling and its frequency. This paper investigates the melt mass-flow rate and the volume-flow rate of ABS subject to the number of thermal transformations, including transitions to plastic state, liquid state and solid state induced by cooling. The results were subjected to mathematical analysis. The examined melt flow rates change very slowly, therefore, polymer materials can be processed repeatedly.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 3.

Tytuł:: Hole extension effect on transpiration flow efficiency
Autorzy:: Lewandowski, T.
Doerffer, P.
Tematy:: perforated wall
L/D ratio
mass flow rate
efficiency; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1938639.pdf Link otwiera się w nowym oknie
Opis:: The present analysis of the hole extension effect on the transpiration flow efficiency is a part of the research [1] which aims at defining a physical transpiration model of the flow through perforated plates. Perforated walls find a wide use as a method of flow control and effusive cooling. Some data on the L/D (hole length to diameter ratio) effect on the flow structure and mass flow rate may be found in the literature [2, 3], but all those works concern holes of a diameter at least one order of magnitude larger than those used in the simulations presented in this paper. Due to the size of the analyzed holes and their cylindrical shape, the only method of analysing the flow through such holes is the numerical method. In the conducted simulations, the holes were D = 0.6 mm, 0.3 mm and 0.125 mm in diameter and the perforation values were equal to 4%, 5%, 8% and 10%. The L/D ratio was changed between 0.25 and 8. The data bank of the flow through the cylindrical holes was produced. The hole extension has a significant influence on the obtained mass flow rate and, consequently, on the transpiration flow efficiency. In addition, entrance effects appear to be important.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Studia nad przepływem masy w suszarniach o przepływie mieszanym
Investigations of the mass flow in the mixed-flow dryers
Autorzy:: Kocsis, L.
Meszaros, C.
Farkas, I.
Tematy:: ziarno
suszenie
przepływ masy
wilgotność
drying
mass flow
moisture; Pokaż więcej
Wydawca:: Instytut Technologiczno-Przyrodniczy
Powiązania:: https://bibliotekanauki.pl/articles/239065.pdf Link otwiera się w nowym oknie
Opis:: Suszenie jest jednym z ważniejszych i najbardziej niezbędnych zabiegów w produkcji rolnej. Około 30% ziarna po zbiorze wymaga suszenia. Proces suszenia jest jednak bardzo energochłonny, a w wielu przypadkach nieprzyjazny dla środowiska ze względu na spalanie paliw kopalnych w celu uzyskania niezbędnej energii cieplnej. Chociaż suszarnie o przepływie mieszanym są szeroko stosowane, wciąż istnieje potrzeba optymalizacji wielu procesów cząstkowych. Na przykład, występują duże różnice w prędkości pionowej partii ziarna, co powoduje różnice w czasie ich ekspozycji. W rezultacie mamy do czynienia z nierównomiernym wysychaniem, a w konsekwencji z niedosuszaniem lub przesuszaniem poszczególnych partii materiału. Przeprowadzone badania miały na celu określenie oddziaływania ścianek komory suszenia oraz daszkowych kanałów powietrznych, na rozkład prędkości masy ziarna. Opracowanie przedstawia wyniki doświadczeń z przepływem ziarna. W przyszłych działaniach przewiduje się opracowanie modelu PFC dla przepływu masy ziarna, co umożliwi doskonalsze prognozowanie przebiegu procesu suszenia.
Drying is one of the most important and most significant operations in agricultural business. Approximately 30% of the grain must be dry after harvesting. The energy consumption of the drying process is extremely high and in many cases it is not environment friendly because of the combustion of fossil fuels to produce the required heat energy. Although the mixed-flow dryers are widely used it is still necessary to optimize many segment processes. For example there are big differences in the vertical grain particle velocity causing differences in the residence time. As a result, uneven drying occurs and, hence, under-drying or over-drying of single grain portions. To investigate the influences of the dryer walls and the air ducts on the particle velocity distribution experiments have been carried out. Hereby this work submits the results of the grain-flow experiments. In a future work a PFC model for the grain mass flow will be developed enabling improvements in the prediction of the drying process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Experimental research on the influence of the pulse injector control parameters on its flow rate
Badania eksperymentalne wpływu parametrów sterowania na wydatek impulsowych wtryskiwaczy gazu
Autorzy:: Czarnigowski, J.
Tematy:: injector
mass flow
control
LPG
CNG
wtryskiwacz
wydatek
sterowanie; Pokaż więcej
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Powiązania:: https://bibliotekanauki.pl/articles/133295.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of the impact of the control parameters on the fuel mass flow from the injector. The control parameters examined in the paper were: frequency and pulse width modulation of the modulated control signal (the second part of the injector control signal). The analysis covers 6 injector types of different design of the valve element and the coil. The experiments have shown that the frequency of the signal does not affect the injector performance, contrary to pulse modulation affecting the injector performance significantly.
W artykule przedstawiono wyniki badań stanowiskowych wpływu parametrów sterowania na wydatek wtryskiwacza. Jako parametry sterowania rozumiano wypełnienie oraz częstotliwość sygnału modulowanego, czyli drugiej części sygnału sterowania wtryskiwaczem. Przedstawiono wyniki badań stanowiskowych 6 typów wtryskiwaczy różniących się konstrukcją zarówno elementu zaworowego, jak i cewki elektromagnetycznej. Wykazano, że częstotliwość sygnału prawie nie wpływa na wydajność wtryskiwaczy, w przeciwieństwie do wypełnienia, które wpływa znacznie.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Jurassic syn-rift and Cretaceous syn-orogenic, coarse-grained deposits related to opening and closure of the Vahic (South Penninic) Ocean in the Western Carpathians – an overview
Autorzy:: Plasienka, D.
Tematy:: Western Carpathians
Mesozoic
rifting
thrusting
deep-marine clastics
mass flow deposits; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2060512.pdf Link otwiera się w nowym oknie
Opis:: Although no undoubted oceanic crustal rock complexes of Penninic affinity participate in the present surface structure of the Western Carpathians, indirect lines of evidence suggest prolongation of the South Penninic-Vahic oceanic tract into the ancient Carpathians. The sedimentary record of both the syn-rift and syn-orogenic clastic deposits reveal their origin between the outer Tatric (Austroalpine) and the inner Oravic (Middle Penninic) margins. The rifting regime is exemplified by the normal fault-related scarp breccias of the Jurassic Borinka Unit in the Male Karpaty Mts., which are characterized by local, gradually denuded source areas. Two other regions provide examples of a contractional regime, both related to shortening and closure of the Vahic oceanic domain. The Belice Unit in the Povazsky Inovec Mts. includes Upper Jurassic-Lower Cretaceous eupelagic, mostly siliceous deposits and a thickening-upwards Senonian sequence of turbiditic sandstones, conglomerates and chaotic breccias. It is inferred that this succession represents the sedimentary cover of oceanic crust approaching a trench, its incorporation in the accretionary complex and finally underthrusting below the outer Tatric margin. In the Oravic units of the Pieniny Klippen Belt, deep-marine conglomerate/breccia bodies with olistoliths indicate collision-related thrust stacking that started from the Maastrichtian (Gregorianka Breccia of the Sub-Pieniny Unit) and terminated with the Lower Eocene Milpos Breccia in the Saris Unit. In addition, a tentative recycling scheme of “exotic” clastic material from mid-Cretaceous conglomerates of the Klape Unit to various Klippen Belt units is outlined. This material is considered to be unrelated to the Vahic oceanic realm and its closure, and likely represents erosional products of more distant orogenic zones.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Pomiar parametrów przepływowych elementów pneumatycznych
Measurements of flow parameters of pneumatic elements
Autorzy:: Dindorf, R.
Tematy:: pomiar strumienia przepływu
charakterystyki przepływowe
termiczny przepływomierz masowy
flow measurement
flow characteristics
thermal mass flow-meter; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/156435.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono budowę i zasadę działania stanowiska pomiarowego do badania parametrów przepływowych elementów pneumatycznych. Na stanowisku pomiarowym zastosowano przepływomierz termiczny Setaram U70, zwężkę Venturiego i znormalizowaną kryzę pomiarową. Przedstawiono metodę wyznaczania charakterystyk przepływowych elementów pneumatycznych na przykładzie zespołu przygotowania powietrza typu FR (filtr, regulator ciśnienia).
In the paper an arrangement and principle of work of a measurement stand for investigations of flow parameters of pneumatic elements are described. The thermal flow-meter Setaram U70, Venturi tube and calibrated orifice is applied in this stand. A method of measurements of flow characteristics for pneumatic elements, air preparation unit FR (filter, pressure regulator), are presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Slope failure on a Cambrian carbonate platform, mass-flow transitions and resulting complex deposit
Autorzy:: Wang, Zhaopeng
Liu, Jiaye
Van Loon, A. J. (Tom)
Zhu, Decheng
Qin, Peng
Han, Zuozhen
Tematy:: Gushan Formation
Middle Cambrian
epeiric sea
carbonate platform
mass-flow transitions; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2058558.pdf Link otwiera się w nowym oknie
Opis:: The quiet environment of the carbonate platform in the epeiric sea that existed during the Cambrian between present-day China and Korea was occasionally affected by processes that have hitherto not been described from such a setting. A conglomerate was found in the Middle Cambrian Gushan Formation near Chengouwan (Shandong Province, E China), eroded into the underlying sediments. The conglomerate is explained as a deposit consisting of material that was eroded up-slope when slope-failure took place, resulting in a slump that passed into a high-density debris flow with erosive power that passed, in turn, again into a slump. The slump came to rest when it lost its momentum on a less inclined part of the basin slope. Immediately after deposition, fluidization occurred in the lower part of the slump deposit, as proven by a funnel-shaped water-escape structure and a lateral injection of some metres long of brecciated material.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Eustatic and tectonic control on late Eocene fan delta development (Orava Basin, Central Western Carpathians)
Autorzy:: Starek, D.
Sliva, L’.
Vojtko, R.
Tematy:: Paleogene
Orava
Western Carpathians
fan delta
mass flow deposits
coarse-grained delta; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2058980.pdf Link otwiera się w nowym oknie
Opis:: The evolution of the Central Carpathian Paleogene Basin (CCPB) reflects an important role of relative sea level changes on a tectonically active basin margin. After the initial upper Lutetian/Bartonian transgression, the next regressive-transgressive cycle played a key role in a formation of the late Eocene fan delta facies associations in the southern Orava region of Northern Slovakia. Detailed sedimentary analysis allowed the separation of the following three facies associations which represent distinct depositional environments: alluvial fan (subaerial fan delta; Unit 1); subaqueous fan delta (Unit 2); and prodelta/slope and basin (Unit 3). The first stage of delta development is connected with eustatic sea level fall at the Bartonian/Priabonian boundary, accompanied by subaerial exposure, fluvial incision and deposition of alluvial fan sediments. Subaerial deposition was characterized by a variety of mass flow conglomerates with a red muddy matrix, interfingering with stream or sheetflood deposits. The next stage of the delta corresponds to high-amplitude transgression related to rapid tectonic subsidence along the CCPB margins during the Priabonian. The vertical arrangement of facies suggests retrograde delta development that shows rapid submergence of the subaerial parts and onlap of subaqueous mass flow conglomerates, often reworked by waves or wave-induced shallow-marine currents. Continuous deepening of the depositional environment during the late Priabonian/early Rupelian led to the relatively rapid superposition of prodelta/slope and basin facies associations by slowly accumulated hemipelagic deposis.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Facies heterogeneity of a deep-sea depositional lobe complex : case study from the Słonne section of Skole Nappe, Polish Outer Carpathians
Autorzy:: Łapcik, Piotr
Opis:: This article reports on the first detailed study of the Skole Nappe’s Ropianka Formation in the Słonne outcrop section along river San. Lithological and micropalaeontological similarities indicate that the sedimentary succession correlates with the formation’s Wiar Member of Campanian-late Maastrichtian age. The sedimentary succession, more than 140 m thick, is interpreted as a deep-marine complex of turbiditic depositional lobes and the study reveals its sedimentary anatomy. Six component facies of sediment gravity-flow deposits and their stratigraphic grouping into four facies associations are recognized, with these latter considered to represent deposits of the lobe axial zone, lateral flank zone and featheredge fringe zone, as well as an interlobe outer-fringe zone. Semi-quantitative characterization and comparison of facies associations gives insight into the succession’s sedimentary heterogeneity. Six depositional lobes superimposed upon one another are recognized in the stratigraphic succession, and their pattern of vertical stacking is interpreted in terms of dynamic stratigraphy on the basis of the upward succession of facies associations. The stratigraphic arrangement of facies associations is attributed to autogenic morphodynamic changes within the evolving depositional system, although it cannot be precluded that also eustatic and local tectonic forcing came into play. The case study sheds more light on the sedimentary environment, sediment sourcing system and spatial depositional pattern in the Late Cretaceous Skole Basin, where the aggrading seafloor apparently oscillated around the lysocline depth that could be mid-bathyal at that time.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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