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    Wyświetlanie 1-6 z 6
    Tytuł:
    Application of CFD for analysis of the ship and propeller flow
    Autorzy:
    Bugalski, T. J.
    Szantyr, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953974.pdf
    Data publikacji:
    1998
    Wydawca:
    Politechnika Gdańska
    Tematy:
    computational fluid dynamics CFD
    CFD
    propeller flow
    ships
    Navier-Stokes equation
    free surface
    propeller operation
    PANSHIP computer system
    Opis:
    The paper describes the computer system PANSHIP for analysis of flow around the ship hull moving with constant velocity in calm water, including the effects of free surface and propeller operation. This system calculates the potential flow using the discrete distribution of Rankine sources on the hull. Viscous flow is computed using the integral method in the bow section and Reynolds averaged Navier Stokes equation (RANS) in the stern section of the ship hull. Results of this analysis may be directly used in ship hull design and they may also serve as input for calculation of the unsteady flow phenomena accompanying propeller operation in the non-uniform velocity field generated by the hull. PANSHIP has been verified experimentally and it forms a useful tool available for ship designers and for marine hydrodynamicists.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 349-356
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment of Craft Brewery Sewage with SS VF and FWS Constructed Wetland – Lab Scale Experiment
    Autorzy:
    Dąbrowski, Wojciech
    Karolinczak, Beata
    Malinowski, Paweł
    Lech, Magrel
    Powiązania:
    https://bibliotekanauki.pl/articles/2069918.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    craft brewery
    sewage treatment
    constructed wetlands
    subsurface flow system
    surface flow system
    Opis:
    The problem of wastewater treatment from craft breweries emerged in Poland about 10 years ago when an increase in the number of small breweries was observed. Plants located in small towns are forced to solve the problem on their own. One of the possibilities is to use low-cost technology of constructed wetlands with subsurface and surface flow. The purpose of the research was to test the possibility of effective treatment of sewage from a craft brewery in a lab-scale research installation and to determine the parameters for designing a real scale plant. Wastewater from the Waszczukowe brewery was used in the study. The research system consisted of a retention and aeration tank, SS-VF subsurface flow and FWS surface flow beds. An innovative Certyd filling produced by LSA company was used. The high efficiency of SS-VF bed and the entire research system was found. The removal efficiency in SS VF was on average 89.7% for BOD5, 90.5% for COD, 54.6% for TN and 52.1% for TP. For whole treatment it was respectively 97.1%, 96.7%, 72.6% and 61.3%. A high organic matter removal effect was found for the SS-VF bed (87.1 g BOD5g m-2 d-1) and a relatively low for the FWS (3.0 BOD5g m-2 d-1). The study confirmed the need for plant design based on hydraulic load and required load removed per unit area.
    Źródło:
    Rocznik Ochrona Środowiska; 2021, 23; 290--300
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forecasting the Flow Coefficient of the River Basin Using Adaptive Fuzzy Inference System and Fuzzy SMRGT Method
    Autorzy:
    Gunal, Ayse Yeter
    Mehdi, Ruya
    Powiązania:
    https://bibliotekanauki.pl/articles/27323840.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ANFIS
    adaptive neuro-fuzzy inference system
    SMRGT
    flow coefficient
    fuzzy logic
    surface water
    Opis:
    In hydrology and water resources engineering, predicting the flow coefficient is a crucial task that helps estimate the precipitation resulting in a surface flow. Accurate flow coefficient prediction is essential for efficient water management, flood control strategy development, and water resource planning. This investigation calculated the flow coefficient using models based on Simple Membership functions and fuzzy Rules Generation Technique (SMRGT) and an Adaptive Neuro-Fuzzy Inference System (ANFIS) model. The fuzzy logic methods are used to model the intricate connections between the inputs and the output. Statistical parameters such as the coefficient of determination (R2), the root mean square error (RMSE), the mean absolute error (MAE), and the mean absolute percentage error (MAPE) were used to evaluate the performance of models. The statistical tests outcome for the SMRGT model was (RMSE:0.056, MAE:1.92, MAPE:6.88, R2:0.996), and for the ANFIS was (RMSE:0.96, MAE:2.703, MAPE:19.97, R2:0.8038). According to the findings, the SMRGT, a physics-based model, exhibited superior accuracy and reliability in predicting the flow coefficient compared to ANFIS. This is attributed to the SMRGT’s ability to integrate expert knowledge and domain-specific information, rendering it a viable solution for diverse issues.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 7; 96--107
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Desulfurization of Crude Oil by Laboratory Developed Multipumping Flow Injection Analysis System with Optimization by Response Surface Methodology
    Autorzy:
    Hadi, Ahmed Abdulrazzaq
    Ali, Ali Abdulkhabeer
    Khathi, Mohammed Turki
    Powiązania:
    https://bibliotekanauki.pl/articles/2202370.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    multi-pumping flow system
    desulfurisation
    response surface
    optimal conditions
    Opis:
    Sour crude oil is the crude oil that contains a high level of sulfur impurity. It can be toxic and corrosive. Before this lower-quality crude can be processed into other crude oil derivatives, the sulfur content must be reduced, raising the processing cost. A homemade semi-automated multipumping flow analysis system was constructed, consisting of several parts available on the local markets and at low economic costs to decrease the sulfur content of crude oil samples collected. The central composite design (CCD) and response surface methodology (RSM) have been used for modeling and optimization. The effects of the operational parameters, including polar and nonpolar solvent types, solvent flow rates (10–40 ml/min), mixing coil lengths (120–200 min), temperature (30–60 °C), and solvent entry time to the system (0–60 sec) were studied. Experimental and theoretical applications were made to determine the optimal sulfur content, which came out to be 1.438 and 1.395 wt.%, respectively. This system evaluated the effectiveness of the sulfur removal content for actual heavy crude oil by experimentally and theoretically to be 65.73 and 66.75% respectively. The semi-automated system was applied successfully to reduce the sulfur content in a highly sensitive and accurate way.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 2; 328--339
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza kontaktu wód podziemnych i powierzchniowych na podstawie badań ich jakości na młodoglacjalnym obszarze Pojezierza Kaszubskiego
    Investigation of groundwater – surface water contact based on the quality research in a young glacial area of the Kashubian Lake District
    Autorzy:
    Jaworska-Szulc, B.
    Pruszkowska-Caceres, M.
    Przewłócka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075135.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    groundwater quality
    surface water quality
    young glacial area
    groundwater flow system
    jakość wód podziemnych
    jakość wód powierzchniowych
    obszar młodoglacjalny
    przepływ wód podziemnych
    Opis:
    Regions formed in late Pleistocene usually show complex hydrogeological conditions. Groundwater circulation and the contribution of surface water in the groundwater flow system is not easy to determine. An important tool in such a research seems to be investigation of groundwater and surface water chemical composition. This paper is a case study of survey led in szymbarskie hills of the Kashubian Lake District (northern Poland). The groundwater and surface water quality was determined and analyzed with respect to conditions of groundwater circulation. The obtained results may contribute to development of groundwater investigations in young glacial areas.
    Źródło:
    Przegląd Geologiczny; 2014, 62, 4; 204--213
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rational Liquid Cooling Systems of Internal Combustion Engines
    Autorzy:
    Moshentsev, Yuryi
    Gogorenko, Oleksiy
    Dvirna, Olha
    Powiązania:
    https://bibliotekanauki.pl/articles/2022422.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    charge air cooler
    cooling systems
    heat transfer surface
    Internal combustion engines
    oil coolers
    low-flow system
    Opis:
    The scheme of the cooling system is considered, which can be the basis for creating the most efficient cooling systems for IC engines of any purpose. It is assumed that the use of any other scheme is devoid of a rational basis. The scheme consists of two connected circulation circuits, in one of which the coolant flow rate is an order of magnitude less than in the second. The engine is included in a circuit with increased coolant flow. All heat exchangers are in the second circuit. Rules for the formation of such systems are formulated. The basis of the method for calculating such systems is considered. It is indicated that the flow rate through each heat exchanger must be determined by calculation to ensure the maximum efficiency of the cooling system. The considered scheme allows to provide the maximum possible depth of charge air cooling, if its temperature is not specified, or to ensure the minimum cost and compactness of the cooling system, if this temperature is known. The scheme allows regulating the temperatures of the cooling fluids of the system with all kinds of changes in the engine operating conditions and the ambient temperature.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 1; 158-169
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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