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Tytuł:
Modelowanie zjawisk wymiany ciepła i transportu masy w solarnym podgrzewaczu powietrza
Modeling of heat and mass transfer in an air solar heater
Autorzy:
Żukowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2072033.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
CFD
powietrzne kolektory słoneczne
technika mikrostrumieni
wymiana ciepła
air solar heater
microjet technique
heat transfer
Opis:
W pracy zaprezentowano prototypową konstrukcję kolektora słonecznego bazującego na technice mikrostrumieni powietrznych. Do analizy procesu wymiany ciepła i transportu masy zachodzących w testowanym urządzeniu wykorzystano symulacje komputerowe z zastosowaniem algorytmów CFD. Sprawność cieplna kolektora, definiowana jako stosunek energii konwertowanej na ciepło do całkowitej energii promieniowania padającej na absorber, mieściła się w granicach od 60% do ok. 90%. Porównanie rezultatów obliczeń numerycznych oraz wyników eksperymentu świadczy o stosunkowo dużej dokładności wykonanych symulacji.
A prototype construction of solar panel applying the air microjet technique is presented in the paper. Computer modeling based on CFD was used as a research tool for analyzing heat and mass transfer inside the novel device. The collector thermal efficiency defined as a ratio of energy converted into heat to total absorber incident radiation ranged from 60% to about 90%. Comparison between numerical calculations and experimental results shows a relatively high precision of simulation performed.
Źródło:
Inżynieria i Aparatura Chemiczna; 2014, 1; 51--52
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacja numeryczna charakterystyki cieplnej i przepływowej rur o przekroju eliptycznym
Numerical simulation of thermal and flow performance of elliptical tubes
Autorzy:
Żukowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/404180.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Symulacji Komputerowej
Tematy:
rury elipsoidalne
komputerowa mechanika płynów
wymiana ciepła
straty ciśnienia
elliptical tubes
computational fluid dynamics (CFD)
heat transfer
pressure loss
Opis:
W artykule zaprezentowano charakterystykę cieplną i przepływową przewodów o przekroju elipsy. Jako narzędzie badawcze posłużyły symulacje numeryczne bazujące na algorytmach komputerowej mechaniki płynów. Obliczenia wykonano dla sześciu wartości stosunku promieni elipsy wK: 1, 1.21, 1.44, 1.62 1.96 i 2.56 oraz czterech wartości liczby Reynoldsa z przedziału od 3600 do 72000. Na podstawie przeprowadzonej analizy stwierdzono, że zmiana wartości wK, w rozpatrywanych granicach, wpływa na wzrost jednostkowych strat ciśnienia od 1.2% do 32.1% oraz zwiększenie strat mocy cieplnej od 0.7% do 16.7% w porównaniu do rurociągu o przekroju kołowym o tej samej powierzchni.
This paper presents the thermal and flow characteristics of pipes with a cross-section of an ellipse. Numerical simulations based on algorithms of computational fluid dynamics were used as a research tool. The calculations were made for the six values of the ratio of the ellipse radius wK: 1.0, 1.21, 1.44, 1.62, 1.96 and 2.56, and the four values of the Reynolds number range from 3600 to 72000. Based on the analysis it was found that change in the value wK, in the analyzed limits, affects the increase in pressure loss from 1.2% to 32.1% and increase the heat loss from 0.7% to 16.7%, compared to the circular section tube of the same area.
Źródło:
Symulacja w Badaniach i Rozwoju; 2014, 5, 1; 71-78
2081-6154
Pojawia się w:
Symulacja w Badaniach i Rozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear Regression Model for Ride on Railway
Nieliniowy model regresji w kolejnictwie
Autorzy:
Żółtowski, B.
Castaneda, L.
Żółtowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/952281.pdf
Data publikacji:
2016
Wydawca:
Instytut Kolejnictwa
Tematy:
rail vehicle
heat release rate
fire
EU499 Eureka Project
transfeu Project
Metro Project
CFD
model regresji
kolejnictwo
zbiór rozmyty
Opis:
Th e portable diagnosis system – SPD – evaluates the safety and ride quality aspects of the railway vehicles and the technical condition of the rail-vehicle interface. Th e objective of this article is to estimate the nonlinear regression model associated with the ride quality or motion behavior, by applying fuzzy clustering algorithms to the geometric data obtained from the technical condition of the railway-vehicle interface and measuring quasi-static lateral acceleration y* qst in diff erent vehicles. Th e performance will be evaluated by comparing the measured acceleration y* qst with the acceleration calculated in our model y* qstM for 15 diff erent vehicles. Th e obtained results will be then compared with the results of the multiple linear regression model used previously for the same purpose.
Przenośny system diagnostyczny – SPD ocenia aspekty bezpieczeństwa i jakości biegu pojazdów kolejowych oraz stanu technicznego pojazdu kolejowego. Celem niniejszego artykułu jest oszacowanie nieliniowego modelu regresji związanego z zachowaniem jakości jazdy, przez zastosowanie rozmytego algorytmu klastrowania danych geometrycznych stanu technicznego pojazdu kolejowego i pomiary quasi-statyczne przyspieszeń poprzecznych pojazdów szynowych. Będzie to ocena porównawcza zmierzonego realnego przyspieszenia z przyspieszeniem obliczonym skonfigurowanego modelu dla 15 różnych pojazdów. Uzyskane wyniki będą porównane z wynikami modelu liniowej regresji wielokryterialnej, które były dotychczas w tym celu stosowane.
Źródło:
Problemy Kolejnictwa; 2016, 173; 73-82
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD simulations of influence of steam in gasification agent on parameters of UCG process
Autorzy:
Żogała, A.
Janoszek, T.
Powiązania:
https://bibliotekanauki.pl/articles/92198.pdf
Data publikacji:
2015
Wydawca:
Główny Instytut Górnictwa
Tematy:
obliczeniowa mechanika płynów
czynnik zgazuwujący
skład syngazu
temperatura
computational fluid dynamics (CFD)
gasification agent
syngas composition
temperature
Opis:
Underground coal gasification (UCG) is considered to be a perspective and constantly developing technology. Nevertheless it is a very complex and technically difficult process, which results depend on many variables. Mathematical models enable detailed analysis of UCG process - for example - give possibility of prediction of syngas composition depending on applied gasification medium. In practice, mixtures of oxygen, air and steam are the most frequently used as converting agents. Steam is injected to the reactor in order to obtain combustible components. Nevertheless higher concentrations of steam create a problem of reduction of temperature in reactor. This issue of amount of steam in reacting system was analyzed in given paper. Computer simulations were used as test method applied in presented work. Calculations were carried by using Computational Fluid Dynamics (CDF) method and Ansys Fluent software. Changes in outlet concentrations of syngas components (CO, CO2, CH4, H2O, H2), in relation with time of process, were presented. Composition of product gas, its heating value and temperature of process were also examined (on outlet of rector) in function of content of steam in gasification agent (which was mixture of O2 and H2O). Obtained results indicated a possibility of conduct of stable gasification process (with predictable characteristic of gas). The simulation also demonstrated a possibility of deterioration of conditions in real reactors as a results of applying of too high amounts of steam.
Źródło:
Journal of Sustainable Mining; 2015, 14, 1; 2-11
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical analysis of underground coal gasification models. Part II: Kinetic and computational fluid dynamics models. Literary studies and comparison of models
Autorzy:
Żogała, A.
Powiązania:
https://bibliotekanauki.pl/articles/91950.pdf
Data publikacji:
2014
Wydawca:
Główny Instytut Górnictwa
Tematy:
coal gasification
kinetic models
CFD models
zgazowanie węgla
model kinetyczny
model CFD
Opis:
Purpose Underground coal gasification, as a complex and technically difficult process, in many aspects requires the support provided by computer simulations. There are a lot of mathematical models of UCG, some of them are concentrated with the forecast of syngas composition. The most important may be divided into three groups: equilibrium, kinetic and CFD models. The purpose of this work was the detailed critical analysis of more advanced approaches (than equilibrium considerations) applied in simulations of the coal conversion process – both kinetic and based on computational fluid dynamics. The other aim of this paper was the comparative analysis of the most important models of underground coal gasification. Methods Literary studies, concerned with the features and mathematical description of kinetic and CFD models of coal gasification, were used as the research method applied in the work presented. Compilation of the kinetic parameters of gasification reactions was an important part of this article. For that purpose the analysis of Polish and foreign papers, monographs and university handbooks was undertaken. Results Critical analysis of kinetic and CFD models of coal gasification (together with their mathematical formulation) was the result of considerations presented in this article. Kinetic equations were shown separately for pyrolysis, homogenous and heterogeneous reactions. In the case of CDF models, except for the presentation of the conservation equation, the most important methods of modeling turbulence are described (for the reason that this phenomenon may have significant inflence on the final results). Practical implications The work presented describes practical issues connected with kinetic and CFD models, focusing on their capabilities, drawbacks and possible application problems. Originality/ value This paper presents state of art in the field of coal gasification modeling using kinetic and computational fluid dynamics approach. The paper also presents own comparative analysis (concerned with mathematical formulation, input data and parameters, basic assumptions, obtained results etc.) of the most important models of underground coal gasification.
Źródło:
Journal of Sustainable Mining; 2014, 13, 1; 29-37
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of oil leaks in a variable-height gap between the cylinder block and the valve plate in a piston pump by means of author-designed software and CFD Fluent
Analiza przecieków oleju w szczelinie rozrządu pompy wielotłoczkowej z uwzględnieniem własnego programu i CFD Fluent
Autorzy:
Zloto, T.
Sochacki, D.
Stryjewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/792175.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
oil leakage
computational model
gap
cylinder block
piston pump
numerical method
CFD Fluent software
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 4
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie odciążenia bloku cylindrowego pompy wielotłoczkowej z wykorzystaniem programu Fluent
Modelling of hydrostatic relief of the cylinder block in an axial piston pump with the use of the fluent software
Autorzy:
Zloto, T.
Sochacki, D.
Stryjewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/76877.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
pompy wielotloczkowe
pompy wielotloczkowe osiowe
szczeliny o zmiennej wysokosci
rozklad cisnienia
straty energii
program CFD Fluent
modele numeryczne
badania modelowe
Opis:
W pracy przedstawiono model numeryczny obliczania ciśnienia w szczelinie klinowej rozrządu tarczowego pompy wielotłoczkowej osiowej z zastosowaniem pakietu CFD Fluent. Wykorzystując opracowany model wykonano analizę sił odciążających w zależności od zmiennego kąta pochylenia bloku cylindrowego.
The paper presents the numerical model for calculating the pressure in a variable-height gap between the cylinder block and the valve plate in an axial piston pump. This numerical model was created in CFD Fluent software. The same numerical model was used to analysis of hydrostatatic relief of the cylinder block. The analysis was performed as a function of the inclination angle ofthe cylinder block
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 1
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of species diffusion and methanol decomposition in thermocatalytic reactor based on the Intermetallic phase of Ni3Al for low Reynolds numbers
Autorzy:
Ziółkowski, Paweł
Stajnke, Michał
Jóźwik, Paweł
Bojar, Zbigniew
Ziółkowski, Piotr Józef
Badur, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/1955275.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska
Tematy:
CFD
thermocatalytic reactor
intermetallic phase of Ni3Al
Opis:
Numerical modelling of hydrogen production by means of methanol decomposition in a thermocatalytic reactor using corrugated foil made of the Ni3Al intermetallic phase is shown in the paper. Experimental results of the flow analysis of mixtures containing helium and methanol in a thermocatalytic reactor with microchannels were used for the initial calibration of the CFD calculations (calculations based on the Computational Fluid Dynamics method). The reaction of the thermocatalytic methanol decomposition was modelled based on experimental data, considering the size of the active surface. The drop in the methanol concentration at the inlet to the reactor, ten millimetres in front of the thermocatalytic region, is associated with the diffusion of streams of other components, mainly hydrogen and carbon monoxide. The commercial CFD code was expanded by User Defined Functions (UDFs) to include surface chemical reaction rates in the interphase between the fluid and the solid. Extrapolation of data by means of the implemented numerical model enabled the assessment of the minimum length of microreactor channels and prediction of the optimal dimension at the system outlet. The results obtained by means of numerical calculations were calibrated and compared with the experimental data, confirming a satisfactory consistency of the data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2018, 22, 3; 211--224
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of unsteady forces acting on a slender cylinder
Autorzy:
Ziółkowski, P. J.
Witkowski, W.
Sobczyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/175172.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unsteady flow
FSI
CFD modelling
CSD modelling
Opis:
Developments in construction engineering (new materials, construction techniques) facilitate the design of very flexible, light structures with low damping which unfortunately results in higher susceptibility of these structures to wind action. It is therefore necessary to use more accurate scientific tools in the engineering phase of these structures. Analytical methods for considering wind effects on structures encounter difficulties with respect to mathematical formulations of aerodynamic forces. In this paper a 2D numerical model has been described which considers the fluid domain with respect to a cylindrical obstacle. This 2D model has been discretized using the finite volume method, and numerical simulations have been undertaken in order to describe the unsteady flow conditions within the analyzed domain. The simulations have been performed with boundary conditions characterizing the flow past a cylindrical obstacle. The results have been compared with the literature data from similar experiments. On the basis of the flow characteristics obtained, as well as the spatial distributions of the flow parameters, a model for further 3D analyses was selected. Next, a 3D numerical study of unsteady flow forces acting on a slender cylinder has been analyzed. Toward the end, a two-way fluid solid interaction approach has been utilized, which incorporates a computational fluid dynamics approach combined with computational solid dynamics.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2018, 140; 23-38
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of a mixture flow of helium and methanol in thermocatalytic reactor and chemical reactions on the intermethallic phase of Ni3A
Autorzy:
Ziółkowski, P.
Stajnke, M.
Jóźwik, P.
Powiązania:
https://bibliotekanauki.pl/articles/175269.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CFD modeling
numerical analysis
methanol decomposition
catalytic reactions
Opis:
In this paper, the specified issues that occurs in the numerical modeling of complex phenomena of chemical reactions intensified with forced fluid flow in the thermocatalytic reactor channels on the intermetallic phase of Ni3Al are presented. Based on the example of flowing mixture containing helium contaminated by methanol in a horizontal microchannels, heated from the outside, received results of the experiment were shown and compared with computational fluid dynamize calculations. However, standard version of commercial code have been expanded by user definedfunctions. These extensionstransformed the calculation mechanisms and algorithms of computational fluid dynamize codes adapting them for the micro-flow cases and increased chemical reactions rate on an interphase between fluid and solid. Results obtained on the way of numerical calculations were compared with experimental data receiving satisfactory compliance.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 138; 33-73
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-dimensional modelling of thermal stresses in a planar solid oxide fuel cell of a novel design
Modelowanie 3D termicznych naprężeń w płaskim stałotlenkowym ogniwie paliwowym o nowatorskiej konstrukcji
Autorzy:
Zinko, T.
Pianko-Oprych, P.
Jaworski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/408754.pdf
Data publikacji:
2016
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
planar Solid Oxide Fuel Cell
thermal stresses
residual stresses
finite element method
computational fluid dynamics (CFD)
płaskie stałotlenkowe ogniwo paliwowe
naprężenie termiczne
naprężenie szczątkowe
Metoda Elementu Skończonego
Numeryczna Mechanika Płynów
Opis:
The presented modelling investigation was carried out to analyze thermal stresses and expansion in an anode supported planar Solid Oxide Fuel Cell (pSOFC). The temperature distribution was based on previously developed thermo-electrochemical model predicting fuel cell operation. The design of a single pSOFC consisted of three ceramic layers of membrane electrode assembly: anode, electrolyte, cathode and two cross-flow bipolar plates with 26 ribs. The gases flowed diagonally from one cell corner to the opposite one. The fuel and air flows were cross-wise opposed on each bipolar plate side. The study allowed to indicate the most vulnerable to thermal damage area of the fuel cell in the operating conditions. The results will be useful in further design modification and performance optimization of the SOFC.
Przeprowadzone symulacje numeryczne miały na celu analizę termicznych naprężeń i ocenę stopnia wydłużenia płaskiego stałotlenkowego ogniwa paliwowego typu pSOFC (ang. planar Solid Oxide Fuel Cell). Rozkład temperatury w ogniwie wyznaczono w oparciu o wcześniej opracowany model termiczno-elektrochemiczny [11]. Nowatorskie rozwiązanie ogniwa typu pSOFC objęło ceramiczną konstrukcję, w skład której weszły porowate elektrody – anoda i katoda, elektrolit oraz dwie płytki bipolarne z 26-cioma żebrami. Przepływ paliwa i powietrza odbywał się krzyżowo i przeciwprądowo, po przekątnej ogniwa. Wyniki symulacji pozwoliły na określenie obszarów ogniwa narażonych na uszkodzenie w wyniku wysokich wartości naprężeń termicznych. Uzyskane rezultaty FEM umożliwią dalszą modyfikację konstrukcji płaskiego ogniwa w celu optymalizacji wydajności pSOFC.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2016, 1; 69-72
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of propeller fouling on the hydrodynamic performance of a marine propeller
Autorzy:
Zinati, Ali
Ketabdari, Mohammad Javad
Zeraatgar, Hamid
Powiązania:
https://bibliotekanauki.pl/articles/34602878.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
propeller performances
blade roughness
frictional resistance
CFD simulation
fouling
Opis:
Propeller performance is typically considered under clean conditions, despite the fact that fouling is an inevitable phenomenon for propellers. The main objective of this study is to investigate the effects of roughness due to fouling on the performance of a propeller using a CFD simulation in conjunction with the roughness function model. A simulation of a clean propeller is verified for a five-blade propeller model using existing experimental results. A roughness function model is then suggested based on existing measured roughness data. The simulations are extended for the same propeller under varying severities of roughness. Initially, it is concluded that KT and ηo gradually decrease with increasing fouling roughness, while KQ increases, compared to smooth propeller. For instance, at J=1.2 for medium calcareous fouling, KT is reduced by about 26%, KQ increases by about 7.0%, and ηo decreases by 30.9%. In addition, for the rough propeller, the extra power required is defined as the specific sea margin (SSM) to compensate for the power loss. A slight roughness causes a large decrease in ηo. A propeller painted with foul-release paint and an unpainted propeller are found to require 2.7% SSM and 57.8% SSM over four years of service, respectively. Finally, the use of foul-release paints for propeller painting is strongly advised.
Źródło:
Polish Maritime Research; 2023, 4; 61-73
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerodynamic investigation on the artefact “bird of Saqqara”
Autorzy:
Zierow, Michel
Lesemann, Leon
Powiązania:
https://bibliotekanauki.pl/articles/2233069.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
Saqqara
bird
aerodynamics
archaeology
CFD
flight mechanics
Paleo-SETI
Egypt
Ancient Aliens
Opis:
Lost, technical knowledge of ancient cultures is being rediscovered in modern times during archaeological excavations. A presumed example of the innovative power of ancient cultures is the artefact “Bird of Saqqara”. In the context of this paper, the aerodynamic characteristics of the artefact are to be determined by a computational fluid simulation, in order to be able to make a statement about the actual flight suitability and to examine the theses of the pre-astronautics critically. Based on a 3D scan, a CAD model of the artefact is created and then a numerical flow simulation is performed. By varying the angle of attack, the dimensionless coefficients can be represented in corresponding polars. The results show that the artefact has a low maximum glide ratio and thus the glide properties are not sufficient for use as a handglider. The centre of gravity of the artefact is located at the trailing edge of the wing and behind the neutral point. The resulting longitudinal stability does not meet modern specifications. Asymmetric lift distribution in the spanwise direction results in uncontrolled roll. Consequently, the artefact cannot fly a straight path. Within the scope of this work, the connection between the “Bird of Saqqara” and an alleged knowledge of aerodynamics in ancient Egypt could not be confirmed.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 3; 405--409
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the transport of brine in the Odra River downstream of a mines discharge
Autorzy:
Zieliński, Szymon
Kostecki, Stanisław
Stefanek, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2037708.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
water quality
mining
wastewater management
brine
dilution
numerical modelling
CFD
Opis:
The mining of underground deposits causes the inflow of water to workings and the necessity of pumping them to the surface. The mining plant of KGHM Polska Miedź S.A. extracts copper ore in plant branches with different hydrogeological conditions. The inflowing water into the workings is characterised by variable mineralisation, which depends on the location of the branch. In the south-western part of the deposit, a low-mineralised stream with a relatively high flow rate can be observed, while the outflow of highly saline waters occurs in the north-eastern branch. Despite the activities undertaken that aim at using the pumped-off mine waters industrially, it is necessary to deposit them into the Odra River. Reducing the environmental impact on the Odra River is one of KGHM’s goals, which is being implemented by stabilising its salt concentration at a safe level. The paper presents the results of a 3D simulation of brine plume propagation based on a numerical model of advection-diffusion and turbulent flow. Bathymetric data from a section of the river approximately 500 m long and point data from an Odra water quality test were used to develop and validate the model. The paper discusses the types of factors that minimise the impact of brine discharge. The developed model will be used in the future to propose solutions that accelerate the mixing of mine waters with the waters of the Odra River.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, 4; 366-379
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic analysis of gate valve using computational fluid dynamics (CFD)
Autorzy:
Žic, Elvis
Banko, Patrik
Lešnik, Luka
Powiązania:
https://bibliotekanauki.pl/articles/118702.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
gate valve
hydrodynamic analysis
CFD
Ansys Workbench
software package
Opis:
As a very important element of most water supply systems, valves are exposed to the effects of strong hydrodynamic forces. When exposed to large physical quantities, the valve and piping can be damaged, which could endanger the performance of a water supply system. This is the main reason why it is necessary to foresee and determine the maximum values of velocity, pressure and other physical quantities that can occur in the system under certain conditions. Predicting extreme conditions allows us to correctly size the valve for the expected conditions to which the valve might be exposed, which is also the main objective of this paper. One of the methods for predicting and determining extreme values on a valve is to perform a simulation with computational fluid dynamics (CFD). This is exactly the method used in the preparation of this paper with the aim of gaining insight into the physical magnitudes for models of gate valves positioned inside a pipe under characteristic degrees of valve closure. The Ansys CFX 19.1 and Ansys Fluent 19.1 software was used to simulate the hydrodynamic analysis and obtain the required results. The hydrodynamic analysis was performed for four opening degrees of gate valve
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 3; 275-288
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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