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    Wyświetlanie 1-12 z 12
    Tytuł:
    Fabrication and Investigation of the Charge/Discharge Characteristics of Zinc/PVA-KOH/Carbon Cell
    Autorzy:
    Saleem, M.
    Sayyad, M.
    Karimov, Kh
    Ahmad, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585039.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.gk
    82.47.Jk
    84.60.-h
    Opis:
    Electrochemical properties of a zinc/polyvinyl alcohol-potassium hydroxide/carbon cell have been investigated. In this cell, PVA-KOH gel has been used as an electrolyte with PVA/KOH wt.% ratio of 60:40, while zinc and carbon rods served as electrodes. The cylindrical glass vessel of length 3.0 cm and of diameter 2.0 cm has been used as a cell compartment. The current-voltage characteristics and open circuit voltage-time, charge voltage/current-time and discharge voltage/current-time studies have been done. The open circuit voltage has been observed for 160 h. It has been found that the cell shows stability and is rechargeable, too.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 6; 1021-1024
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of operating parameters on production of bio-oil from fast pyrolysis of maize stalk in bubbling fluidized bed reactor
    Autorzy:
    Ali, N.
    Saleem, M.
    Shahzad, K.
    Hussain, S.
    Chughtai, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/779892.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    fast pyrolysis
    bio-oil
    temperature
    particle size
    carrier gas flow rate
    maize stalk
    Opis:
    The yield and composition of pyrolysis products depend on the characteristics of feed stock and process operating parameters. Effect of particle size, reaction temperature and carrier gas flow rate on the yield of bio-oil from fast pyrolysis of Pakistani maize stalk was investigated. Pyrolysis experiments were performed at temperature range of 360-540°C, feed particle size of 1-2 mm and carrier gas flow rate of 7.0-13.0 m3/h (0.61.1 m/s superficial velocity). Bio-oil yield increased with the increase of temperature followed by a decreasing trend. The maximum yield of bio-oil obtained was 42 wt% at a temperature of 490°C with the particle size of around 1.0 mm and carrier gas flow rate of 11.0 m3/h (0.9 m/s superficial velocity). High temperatures resulted in the higher ratios of char and non-condensable gas.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 3; 88-96
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency Dependent Electrical Characteristics οf Au/n-Si/CuPc/Au Heterojunction
    Autorzy:
    Ahmad, Z.
    Sayyad, M.
    Karimov, Kh.
    Saleem, M.
    Shah, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538707.pdf
    Data publikacji:
    2010-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Jv
    73.90.+f
    Opis:
    Electrical characteristics of the heterojunction fabricated by thermal deposition of copper phthalocyanine (CuPc) on an n-silicon substrate have been investigated. The frequency has significant effect on capacitance (C), conductance (G) and series resistance $(R_{s})$ interface states $(D_{it})$ of the junction. Measured capacitance and conductance were corrected for $R_{s}$. The conductance technique was used to measure the density of the interface states. This method revealed the value of the interface state density distribution for the Au/n-Si/CuPc/Au interfaces of the order of $10^{12} cm^{-2} eV^{-1}$.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 3; 493-496
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Safeguard Guide for Recycling and Handling the Alternative of SF6 GAS in Electrical Investigatory Applications
    Autorzy:
    Kharal, H. Shafqat
    Kamran, Muhammad
    Qureshic, Sohail Aftab
    Saleem, M. Zaheer
    Powiązania:
    https://bibliotekanauki.pl/articles/1178068.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    GWP
    Guide
    Recycling
    SF6
    Safeguard
    substitute
    Opis:
    In recent Researchers most, important center of attention to abolish the need of SF6 gas from insulation systems and develop a novel amalgamated surrogate gas with low GWP, premier insulating properties and cost effective. This new-fangled surrogate gas handling and recycling is a complex job. This forecast shall be probable after essential measurements and investigational work. So, it is urgent and imperative need of Safeguard outline for Handling and Recycling the substitute of SF6 gas in electrical power equipment. This procedure establishes safe working practices list to perform elimination, supervision, and demolition of insecure by-products, normal and trouble maintenance work safely on SF6 gas insulated apparatus.
    Źródło:
    World Scientific News; 2018, 95; 182-192
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Site Preference Analysis and Ordering Characteristics of Ternary Cu0.5(Zn1–xMx)0.5 (M = Transition Metals) Alloys
    Autorzy:
    Ahmad, N.
    Ziya, A. B.
    Atiq, S.
    Saifullah, K.
    Hashim, M.
    Saleem, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352693.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ternary alloy systems
    order-disorder transformations
    site occupancy
    ab-initio calculations
    ordering energies
    Opis:
    The site preference of some transition metals during B2-type ordering has been investigated in the ternary Cu0.5 (Zn1-x Mx )0.5 alloys with M = Ti, V, Ag, Au, Cr, Mn, Fe, Co, Ni, Nb, Mo, Hf, Ta, W, Re or Pt (x ≤ 0.01). The statistic-o-thermodynamical theory combined with the electronic theory of alloys has been used to calculate the partial ordering energies, partial short range order parameters and the order-disorder transformation temperatures. The values of partial short range order parameters have been used to determine the site preference of the metal M. The analysis shows that the metals M can be divided into two groups with regard to lattice site occupancy. One group comprising of Cr, Mn, Fe, Co, Ni, Nb, Mo, Hf, Ta, W, Re or Pt was found to prefer Zn sublattice sites, while the second group of Ti, V, Ag or Au atoms prefer Cu sublattice sites. It is found that order-disorder transformation temperature and the site preference of metal M both depend strongly on the partial ordering energies and ternary alloying addition of metal M.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1531-1535
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of stress testing scenarios in reducing the banks-risks : an applied study
    Rola scenariuszy testów stresu w ograniczeniu ryzyka banków : studium empiryczne
    Autorzy:
    Kadhim, Laith Jawad
    Al-sahrawardee, Huda Mohamed Saleem M.
    Karoom, Cpa. Basheer Muqdad
    Powiązania:
    https://bibliotekanauki.pl/articles/405331.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    stress testing
    risk management
    capital sufficiency
    testy warunków skrajnych
    zarządzanie ryzykiem
    wystarczalność kapitału
    Opis:
    The present research aims at drawing or forming a group of scenarios that a bank might be exposed to know the unexpected probable risks and then draw methodologies for facing and stopping or demolishing them. The present research has tackled one of the important parts in the system of banking-risks management which is represented by "stress testing" whose urgent need has arisen as a result of the global financial crisis and the negative effects accompanying it. Basel Treaty has focused on obliging banks to periodically make stress testing to ensure their being safe and the existence of sufficient capital for facing the shocks of unexpected risks. Obviously, this is also applicable to the traditional and Islamic banks as well. As far as the local environment is concerned, the environment of Iraq in particular and the regional area in general are characterized by political and economic instability, a matter that may expose banks to unexpected probable risks. The results shows that the apply stress testing presented by Basel's committee to some of The Iraqi banks. Stress testing have been useless because all the resultant or verified revenues have been the result of the bank-practicing minor activities that are related to banking-process returns (remittances commission).
    Obecne badania mają na celu narysowanie lub sformułowanie grupy scenariuszy, na które bank może być narażony w celu poznania nieoczekiwanego prawdopodobnego ryzyka, a następnie opracowanie metodologii stawienia im czoła, powstrzymania lub zniszczenia. Obecne badania dotyczyły jednej z ważnych części systemu zarządzania ryzykiem bankowym, którą reprezentują „testy warunków skrajnych”, których pilna potrzeba pojawiła się w wyniku globalnego kryzysu finansowego i towarzyszących mu negatywnych skutków. Traktat bazylejski koncentruje się na zobowiązaniu banków do okresowego przeprowadzania testów warunków skrajnych, aby zapewnić ich bezpieczeństwo i istnienie wystarczającego kapitału na pokrycie wstrząsów nieoczekiwanego ryzyka. Oczywiście dotyczy to również banków tradycyjnych i islamskich. Jeśli chodzi o środowisko lokalne, w szczególności środowisko Iraku i ogólnie region regionalny charakteryzują się niestabilnością polityczną i gospodarczą, co może narazić banki na nieoczekiwane prawdopodobne ryzyko. Wyniki pokazują, że zastosuj testy warunków skrajnych przedstawione przez komitet bazylejski w odniesieniu do niektórych banków w Iraku. Testy warunków skrajnych były bezużyteczne, ponieważ wszystkie uzyskane lub zweryfikowane przychody były wynikiem wykonywania przez bank drobnych działań związanych ze zwrotami z procesu bankowego (prowizja za przekazy pieniężne).
    Źródło:
    Polish Journal of Management Studies; 2019, 20, 2; 279-289
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative efficacy of silymarin and choline chloride (liver tonics) in preventing the effects of aflatoxin B1 in bovine calves
    Autorzy:
    Naseer, O.
    Khan, J.A.
    Khan, M.S.
    Omer, M.O.
    Chishti, G.A.
    Sohail, M.L.
    Saleem, M.U.
    Powiązania:
    https://bibliotekanauki.pl/articles/31837.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Aflatoxins are secondary metabolites produced by Aspergillus spp. which are injurious to animals and humans The aim of this study was to determine the effects of aflatoxin B1 (AFB1) on Average Daily Feed Intake (ADFI), Average Daily Weight Gain (ADWG), haematological and serum biochemical responses of Bovine Calves and to determine the comparative efficacy of two different liver tonics against AFB1. Twenty seven calves were selected from herd and divided into 3 groups. All calves were fed with 1.0 mg/kg AFB1 for a period of 10 days. After that they were fed with liver tonics: Silymarin fed at a rate of 600 mg/kg and Choline chloride 500 mg/kg for 7 days. The results indicate that the ADFI and ADWG of AFB1 treated calves decreased significantly. Serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), blood urea nitrogen (BUN) and creatinine significantly increased due to AFB1. In haematology the total erythrocyte count (TEC), total leukocyte count (TLC), haemoglobin concentration (HGB), haematocrit levels (HCT), mean corpuscular haemoglobin (MCH), mean corpuscular volume (MCV) and mean corpuscular haemoglobin concentration (MCHC), lymphocyte %, neutrophil % and monocyte % significantly decreased in AFB1 treated calves after 10 days of feeding. Both liver tonics significantly (p<0.05) improved all the parameters, including ADFI, ADWG, hematologial and serum biochemical test. However, Silymarin comparatively more efficiently ameliorate the effects induced by AFB1 than choline chloride.
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MDB jako efektywna platforma komunikacji między uczniami a nauczycielami: studium z Uniwersytetu Wirtualnego w Pakistanie
    MDB as an Effective Platform of Communication between Students and Teachers A Study of the Virtual University of Pakistan
    Autorzy:
    Saleem, Nadia
    Din, Aisha M
    Sadiq, Saba
    Ahmed, Masroor
    Powiązania:
    https://bibliotekanauki.pl/articles/448420.pdf
    Data publikacji:
    2018
    Wydawca:
    Wydawnictwo Uniwersytetu Śląskiego
    Tematy:
    e-learning
    MDB
    luka komunikacyjna
    system wirtualny
    communication gap
    virtual system
    Opis:
    The integration of distance learning and Information Communication tech-nology has brought a lot of convenience for the students who were earlier facing problems in education due to time and geographical limitations. Since the concept of e-learning is comparatively new and different, the discourse on teaching methodologies and the student–teacher relationship in an e-learning environment has brought many new dimensions under discussion. In a virtual system, the communication bonding between a student and a teacher is not so strong. Students are dependent on one-way communication in the form of recorded lectures, published announcements, and information given on a website. Bridging the communication gap between a student and a teacher through MDB (Moderate Discussion Board) is an effective step taken by the Virtual University of Pakistan in online education to address students. The presented research was aimed at investigating the effectiveness of MDB as an interaction platform between students and course instructors at the Virtual University of Pakistan. The effectiveness of MDBs was measured through analysing the number of MDBs posted in a certain course and the nature of questions asked in MDBs by students. It was a quantitative study in which two Mass Communication subjects were selected through purposive sampling. The collected data were analysed in percentages, and a statistical test Correlation was applied to find out if there was some relation between the strength of students and questions asked through MDB. The study found that although the number of MDBs is quite lower than that of enrolled students, it is an effective platform of communication between students and a teacher, as students can ask questions related to subject, exams, semester activities, and general concerns.
    Integracja nauczania na odległość oraz technologii komunikacyjnych i informacyjnych stała sięźródłem wielu udogodnień dla uczniów, którzy wcześniej doświadczali problemów z edukacjąz powodu ograniczeń czasowych lub geograficznych. Ponieważ e-learning jest pojęciem nowym i odmiennym, dyskurs dotyczący metodologii nauczania i relacji uczeń-nauczyciel w środowisku e-learningowym wprowadził wiele nowych elementów wartych omówienia i rozważenia. W syste-mie wirtualnym powiązanie komunikacyjne miedzy uczniem a nauczycielem nie jest tak mocne jak w systemie klasycznym. Uczniowie muszą polegać na jednostronnej komunikacji w postaci nagra-nych wykładów, publikowanych ogłoszeń lub informacji zamieszczanych w sieci. Redukowanie luki komunikacyjnej między uczniem a nauczycielem za pomocą MDB (platformy zarządzania dyskusją) jest efektywnym krokiem w zakresie edukacji online podjętym przez Uniwersytet Wirtualny w Paki-stanie. Prezentowane w artykule badania miały na celu zbadanie efektywności MDB jako platformy interakcji między uczniami a instruktorami na Uniwersytecie Wirtualnym w Pakistanie. EfektywnośćMDB mierzono za pomocą analizy liczby MDB wysłanych w ramach danego kursu oraz rodzaju pytań zadawanych za pośrednictwem MDB przez studentów. Przeprowadzono badanie ilościowe, w którym wybrano poprzez losowanie celowe dwa przedmioty z kursu Komunikacji Masowej. Dane zebrano i poddano analizie procentowej, a także zastosowano statystyczny test korelacji, aby stwierdzić, czy istnieje zależność między liczbą uczniów a pytaniami zadawanymi poprzez MDB. Stwierdzono, że chociaż liczba MDB jest niższa od liczby uczniów, którzy zapisali się na kurs, to jednak MDB stanowi efektywną platformę komunikacji między uczniem a nauczycielem. Dzieje się tak, ponieważ uczniowie mogą zadawać pytania odnoszące się do przedmiotu, egzaminów, aktyw-ności w semestrze oraz spraw ogólnych.
    Źródło:
    International Journal of Research in E-learning IJREL; 2018, 4, 2; 61-75
    2451-2583
    2543-6155
    Pojawia się w:
    International Journal of Research in E-learning IJREL
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Appraisal of wheat germplasm for adult plant resistance against stripe rust
    Autorzy:
    Saleem, K.
    Arshad, H.M.I.
    Shokat, S.
    Atta, B.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/66682.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    appraisal
    wheat
    germplasm
    plant resistance
    stripe rust zob.yellow rust
    yellow rust
    food security
    plant disease
    Opis:
    The resurgence of wheat stripe rust is of great concern for world food security. Owing to resistance breakdown and the appearance of new virulent high-temperature adapted races of Puccinia striiformis f. sp. tritici (Pst), many high yielding commercial varieties in the country lost their yield potential. Searching for new sources of resistance is the best approach to mitigate the problem. Quantitative resistance (partial or adult plant) or durable resistance is reported to be more stable than race specific resistance. In the current perusal, a repertoire of 57 promising wheat lines along with the KLcheck line Morocco, developed through hybridisation and selection of local and international lines with International Maize and Wheat Improvement Center (CIMMYT) origin, were evaluated under natural field conditions at Nuclear Institute for Agriculture and Biology (NIAB) during the 2012−2013 and 2013−2014 time periods. Final rust severity (FRS), the area under the rust progress curve (AURPC), the relative area under the rust progress curve (rAURPC), and the coefficient of infection (CI) were unraveled to infer the level of quantitative resistance. Final rust severity was recorded when the susceptible check exhibited 100% severity. There were 21 lines which were immune (no disease), 16 which were resistant, five moderately resistant, two resistant-to-moderately resistant, one moderately resistant-to-moderately susceptible, 5 moderately susceptible-to-susceptible, one moderately susceptible, and six exhibited a susceptible response. Nevertheless, 51 lines exhibited a high level of partial resistance while the three lines, NW-5- -1212-1, NW-7-30-1, and NW-7-5 all showed a moderate level of partial resistance based on FRS, while 54 lines, on the basis of AURPC and rAURPC, were identified as conferring a high level of partial resistance. Moreover, adult plant resistance was conferred by 47 wheat lines, based on CI value. It was striking that, 13 immune lines among 21 were derived from parents of CIMMYT origin. Cluster analysis was executed to determine the diversity among the wheat genotypes based on stripe rust resistance and yield parameters. All genotypes were grouped into nine clusters exhibiting a high level of diversity at a 25% linkage distance. There were 29 wheat lines resistant to stripe rust that were grouped into the first three clusters, while 4 high-yielding lines were in Cluster VIII. The susceptible check, Morocco, was separated from rest of lines and fell in the last cluster i.e. Cluster IX. Based on the results, inter-crossing immune/ resistant lines is recommended, and with high yielding lines − it is also recommended that cultivars with improved disease resistance and yield potential be developed.
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An alternative and indirect statistical modeling method for viscosity estimation and its experimental validation for low styrene content polyester resin
    Autorzy:
    Nawaz, A.
    Islam, B.
    Ijaz, M. Z.
    Saleem, U.
    Khattak, M. S.
    Ahmad, S. N.
    Maqsood, N.
    Ali, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/778495.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    indirect method
    polyester resin
    statistical relation
    Ford viscosity cup
    Opis:
    We propose an indirect method of ASTM D-1200 for measurement of viscosity from 0.1 to 30 stokes (St) using Ford cup 5 (range 2~ 12 St) by developing a statistical relation. General purpose low styrene content polyester resin (without adding initiator, hardener and accelerator) was used for viscosity measurement. In existing ASTM D 1200 standard, ford cups (1-4) are used to measure the viscosity up to 2 St, while fifth cup is used for measurement from 2 to 12 St. Viscosity above 12 St is not estimated using existing ASTM D- 1200 method. In contrast, our method and statistical relation proposed in this paper estimates viscosity in the flexible range of 0.1 to 30 St by using Ford cup 5 only. The estimated values were confirmed by existing ASTM D-1200 (0.1 to 12 St) and by using Ubbelohde viscometer (12 to 30 St). Values estimated above 12 St are from the proposed model are also in good conformance (percentage error ~ 5% or less) with experimental results. The satisfaction level of the estimated values with the experiments suggests that the model has also the potential for application to paints, polymer and oil industry.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 4; 60-65
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nature-Based and Technology-Based Solutions for Sustainable Blue Growth and Climate Change Mitigation in Marine Biodiversity Hotspots
    Autorzy:
    Mustafa, Saleem
    Estim, Abentin
    Tuzan, Audrey Daning
    Ann, Chen Cheng
    Seng, Lim Leong
    Shaleh, Sitti Raehanah M.
    Powiązania:
    https://bibliotekanauki.pl/articles/363138.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    blue economy
    sustainable solutions
    disruptive technologies
    development goals
    błękitna gospodarka
    rozwój zrównoważony
    ekosystem
    środowisko morskie
    ochrona środowiska
    Opis:
    This paper discusses the urgent need for human interventions in maximizing the promise of blue growth while ensuring sustainability in all its dimensions. It spares no efforts in highlighting the critical nexus between ocean conservation, climate change mitigation and the ecosystem services. The interpretation underscores the threat that unchecked deterioration of marine environment would present for health of the planet and its people. It is evident that the nature-based solutions provide the best options, but the significance of disruptive technologies and innovations cannot be underestimated. However, the decisions pertaining to devising and applying solutions should be informed by scientific reasoning and available evidence. Increasing attention given to blue economy shows the importance of exploring the sustainable solutions by shaping research that helps in identifying the tangible and integrated actions to fast track our progress towards implementing the Sustainable Development Goals.
    Źródło:
    Environmental Biotechnology; 2019, 15, 1; 1-7
    1734-4964
    Pojawia się w:
    Environmental Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of Turbulent Flow over a Backward-facing Step in an Open Channel
    Autorzy:
    Saleem, Bala Kawa M.
    Mustafa, Andam
    Kareem, Dalshad Ahmed
    Yuce, Mehmet Ishak
    Szydłowski, Micchał
    Al-Ansari, Nadhir
    Powiązania:
    https://bibliotekanauki.pl/articles/31340451.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    open channel
    backward-facing step
    reattachment length
    expansion ratio
    Kɛ- model
    Kω- model
    Opis:
    Computational examinations of the flow field in an open channel having a single Backward- -Facing Step (BFS) with a constant water depth of 1.5 m were performed. The effects of the expansion ratio, and the flow velocity along the reattachment length, were investigated by employing two different expansion ratios of 1.5 and 2, and eight various flow velocities of 0.5, 1, 2, 3, 4, 5, 7.5 and 10 m/sec in the Computational Fluid Dynamic (CFD) simulations. Commercially available CFD software, ANSYS FLUENT, was used for calculations. The simulation outcomes were verified using experimental results. Moreover, analyses were performed by using two equation turbulence closure models, K-ε family (standard, RNG and realizable), and K-ω family (Wilcox’s and SST K-ω). The analyses have revealed that the reattachment length increases with an increase in the expansion ratio, the flow velocity and the Reynolds number. The results obtained for two expansion rates and eight different flow velocities have shown insignificant differences between one turbulence closure model and the others. Furthermore, it was observed that both velocity and expansion ratios have an effect on the reattachment zone size.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2023, 70, 1; 49-69
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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