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Tytuł:
Experimental Diagnostic of Cavitation Flow in the Centrifugal Pump Under Various Impeller Speeds Based on Acoustic Analysis Method
Autorzy:
Al-Obaidi, Ahmed Ramadhan
Powiązania:
https://bibliotekanauki.pl/articles/31339870.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
experimental analysis
impeller speed
cavitation
acoustic signals
Opis:
Condition monitoring in a centrifugal pump is a significant field of study in industry. The acoustic method offers a robust approach to detect cavitations in different pumps. As a result, an acoustic-based technique is used in this experiment to predict cavitation. By using an acoustic technique, detailed information on outcomes can be obtained for cavitation detection under a variety of conditions. In addition, various features are used in this work to analyze signals in the time domain using the acoustic technique. A signal in the frequency domain is also investigated using the fast Fourier method. This method has shown to be an effective tool for predicting future events. In addition, this experimental investigation attempts to establish a good correlation between noise characteristics and cavitation detection in a pump by using an acoustic approach. Likewise, it aims to find a good method for estimating cavitation levels in a pump based on comparing and evaluating different systems.
Źródło:
Archives of Acoustics; 2023, 48, 3; 159-170
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing the operational reliability of a ship by using a composite impeller in the event of hydrophore pump failure
Autorzy:
Jabłońska, Monika
Jurczak, Wojciech
Ozimina, Dariusz
Adamiak, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/24200820.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
carbon-fibre reinforced polyethylene terephthalate glycol
PETG CF
ship’s impeller
pump test bench
pump useful power
total pump efficiency
reliability
3D printing
Opis:
The time-consuming technological process of manufacturing impellers and the high production costs are the reason for the search for alternative materials and manufacturing methods. In this paper, based on a literature analysis, the performance of a pump with an impeller that was manufactured by an incremental method from polyethylene terephthalate with an admixture of glycol and carbon fibre (PETG CF) was selected and studied. Operation tests were conducted on the ship’s rotodynamic pump test bench. The composite impeller pump was shown to have an efficiency at the selected printing parameters of 26,23%, comparable to a tin bronze impeller, which has an efficiency of 27,7%. The maximum pump useful power with the impellers tested was 337 W at a flow rate of 4.42 m3/h. The results confirm that, with a filament layer height of 0.12 mm and 100% fill in the four print contours, the pump characteristics obtained are consistent with those of the reference impeller. This fact ensures continuous operation of the ship’s pump for 48 hours which makes the chosen manufacturing method a reliable emergency method of impeller repair in offshore operations.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 18
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of impeller blade rounding and surface roughness on the internal hydraulics and performance of pump as turbine
Autorzy:
Gaji, Rahul
Doshi, Ashish
Bade, Mukund
Singh, Punit
Powiązania:
https://bibliotekanauki.pl/articles/27309885.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
pump as turbine
impeller blade rounding
CFD analysis of PAT
simple modifications in PAT
hydraulic analysis
pompa jako turbina
zaokrąglenie łopatek wirnika
Analiza CFD PAT
proste modyfikacje w PAT
analiza hydrauliczna
Opis:
The Pump As Turbine (PAT) is an important technology for low-cost micro-hydropower and energy recovery, and hence the internal hydraulics of PAT needs to be clearly understood. Additionally, during its operation, the sediments in the water increase the roughness of the internal surfaces and may alter the internal hydraulics and PAT performance similar to a centrifugal pump or Francis turbine. The researchers tried hard to perform simple modifications such as impeller blade rounding to increase the efficiency of PAT. In this paper, the developed test rig is used to analyze the performance of the impeller blade rounding and is validated with a numerical model. This numerical model is further used to study the influence of impeller blade rounding and surface roughness on internal hydraulics and PAT performance. The impeller blade rounding at the most increased the PAT efficiency by 1-1.5 % at the Best efficiency point (Q=16.8 lps), mainly due to the wake reduction on the suction side and increased flow area. With increasing the surface roughness from 0-70 μm, the PAT efficiency is decreased maximum by 4 %. The efficiency was mainly reduced due to increased hydraulic losses at flow zone and disk friction losses at the non-flow zone.
Źródło:
Archive of Mechanical Engineering; 2023, LXX, 2; 219--245
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM numerical simulation of contact stresses between driving shaft and hub impeller of fuel pump
Autorzy:
Wiater, M.
Chladek, G.
Żmudzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/2201038.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
fibre reinforcement composite
fuel pump
impeller
shaft
hub wear
contact stress
finite elements analysis
FEA
kompozyty wzmocnione włóknami
pompa paliwa
wirnik
wał
zużycie piasty
naprężenia kontaktowe
analiza elementów skończonych
Opis:
Purpose: The aim of the work was to test the contact stresses in the model system of the turbine hub cooperating with the fuel pump drive shaft. The hypothesis of the work was that, by means of FEA, it is possible to assess the contact stresses in the materials of the turbine hub and the fuel pump shaft during torque transmission. Design/methodology/approach: A turbine with fibre-reinforced polyphenylene sulphide (PPS) composite cooperating with a stainless steel shaft (X46Cr13/1.4034) in a commonly used D-flat shape joint was selected for the experimental research. To assess contact stresses, the CAD model (NX, Siemens) of the entire turbine was limited to the hub area. The drive shaft is supported in accordance with the bearing in the fuel pump, and the possibility of rotation about the axis along the length of the torque-producing magnet is taken away. The system was loaded with a torque of 200 Nmm on the turbine. The turbine hub and shaft were calculated, taking into account the phenomenon of contact detachment or slip at the value of the friction coefficient of 0.1. Findings: The pressure transmission area was found in the area at the edge of the flat surface D-flat and on the opposite side of the D-convexity. The contact stresses on the D-flat side reached values close to the composite strength. Research limitations/implications: The studies did not take into account the technological inaccuracies, thermal deformation, local material properties, and wear. The value of the friction coefficient was not measured in realistic conditions with fuel lubrication. Practical implications: FEA has been achieved, which allows to reduce the cost of experimental research. Originality/value: The proposed model allows for further studies of the influence of elasticity of various materials and structures on contact stresses in order to assess wear resistance.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 1; 13--21
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequencing Batch Reactor to Treatment Tofu Wastewater Using Impeller Addition
Autorzy:
Hendrasarie, Novirina
Fadilah, Kabul
Ranno, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/2202235.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
sequencing batch reactor
SBR
stirring speed of impeller
degradation of suspended bacteria
Opis:
The characteristics of the wastewater produced by the tofu industry are high viscosity, slipperiness, and foaming resulting from the continuous fermentation of the tofu bacteria. This made it difficult to reduce the organic content of tofu wastewater, namely biological oxygen demand (BOD5), phosphate (PO4), and Total Nitrogen. A wastewater processor that is designed to handle dense and slippery tofu wastewater is known as a Sequencing Batch Reactor. The impeller is used to create turbulent flow, resulting in more evenly distributed DO, which is difficult to distribute due to the viscous tofu wastewater. The SBR was operated with a hydraulic retention time (HRT) of 24, 36, and 48 hours and an impeller stirring speed of 50, 100, and 150 rpm. The results of the research found that there was an effect on the stirring speed of the impeller and that the low stirring speed of the impeller was not optimal. HRT that was regulated in the SBR cycle has affected the performance of the bacteria. Pseudomonas sp. was found in this study and Bacillus sp., which can degrade up to 90% of phosphate and nitrate.
Źródło:
Journal of Ecological Engineering; 2022, 23, 11; 158--164
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Optimization Parameters on the Efficiency of Aluminium Melt Refining by using Physical Modelling
Autorzy:
Walek, Josef
Michalek, Karel
Tkadlečková, Markéta
Powiązania:
https://bibliotekanauki.pl/articles/2174623.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
physical modelling
refining ladle
blowing of inert gas
degassing of the melt
impeller
modelowanie fizyczne
kadź rafinacyjna
wdmuchiwanie gazu obojętnego
odgazowanie stopu
wirnik
Opis:
The article describes the influence of optimization parameters on the efficiency of aluminium melt refining by using physical modelling. The blowing of refining gas, through a rotating impeller into the ladle is a widely used operating technology to reduce the content of impurities in molten aluminium, e.g. hydrogen. The efficiency of this refining process depends on the creation of fine bubbles with a high interphase surface, wide-spread distribution, the residence time of its effect in the melt, and mostly on the wide-spread dispersion of bubbles in the whole volume of the refining ladle and with the long period of their effect in the melt. For physical modelling, a plexiglass model on a scale of 1:1 is used for the operating ladle. Part of the physical model is a hollow shaft used for gas supply equipped with an impeller and also two baffles. The basis of physical modelling consists in the targeted utilization of the similarities of the processes that take place within the actual device and its model. The degassing process of aluminium melt by blowing inert gas is simulated in physical modelling by a decrease of dissolved oxygen in the model liquid (water).
Źródło:
Archives of Foundry Engineering; 2022, 22, 3; 60--66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of liquid blending dynamics with Maxblend impellers by Electrical Resistance Tomography
Autorzy:
Iwasawa, Suzuka
Kubo, Honami
Takenaka, Katsuhide
Pintus, Sandro
Maluta, Francesco
Montante, Giuseppina
Paglianti, Alessandro
Powiązania:
https://bibliotekanauki.pl/articles/2086792.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maxblend impeller
mixing time
electrical resistance tomography
stirred tank
wirnik
czas mieszania
tomografia oporności elektrycznej
Opis:
The aim of the investigation was liquid mixing time measurement in a laboratory scale stirred tank equipped with a metal Maxblend impeller and comparison with the corresponding mixing time obtained with other conventional impellers. The data are collected by Electrical Resistance Tomography, whose applicability in this case is non-trivial, because of the electrical interferences between the large paddles of the impeller and the measuring system. The raw data treatment methodology purposely developed for obtaining the homogenization dynamics curve is presented. A robust approach for a fine and low cost investigation of the mixing performances of close-clearance impellers in opaque systems is suggested. The analysis of the local and averaged conductivity time traces reveals the effect of important variables, such as the fluid viscosity and the vessel configuration, on the mixing time under various agitation conditions. The data collection and post processing procedures open the way to the application of the technique to multiphase and non-Newtonian fluids stirred with close-clearance impellers.
Źródło:
Chemical and Process Engineering; 2021, 42, 3; 197--207
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat transfer investigations in a liquid that is mixed by means of a multi-ribbon mixer
Autorzy:
Borowski, Tomasz
Sołoducha, Dawid
Musik, Daniel
Wójcik, Krzysztof
Chyla, Mariusz
Ziętarska, Katarzyna
Friedrich, Małgorzata
Kiełbus-Rąpała, Anna
Kordas, Marian
Konopacki, Maciej
Rakoczy, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/1849282.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
multi-ribbon impeller
heat transfer process
heat transfer coefficient
correlation
Opis:
The objective of this paper is to present the investigations of the heat transfer process carried out by means of the multi-ribbon mixer. It is shown that the heat transfer process for the synergic effect of the mixing process and the flowing liquid through the mixer has significantly higher values of the heat transfer coefficients than the mixer with motionless impellers. The empirical correlations between the heat transfer coefficient and the operational parameters obtained in this work can provide guidance for the design and operation of an apparatus equipped with the multi-ribbon impeller. These empirical correlations can be used to predict the heat transfer coefficient for the multi-ribbon mixer.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 2; 66-72
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling particle deagglomeration in a batch homogenizer using full CFD and mechanistic models
Autorzy:
Krzosa, Radosław
Wojtas, Krzysztof
Golec, Jakub
Makowski, Łukasz
Orciuch, Wojciech
Adamek, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/2034041.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
population balance
titanium dioxide
CFD
breakup
high shear impeller
bilans populacji
dwutlenek tytanu
wirnik o wysokim ścinaniu
Opis:
Modelling of titanium dioxide deagglomeration in the mixing tank equipped with a high shear impeller is presented in this study. A combination of computational fluid dynamics with population balance was applied for prediction of the final particle size. Two approaches are presented to solve population balance equations. In the first one, a complete population balance breakage kinetics were implemented in the CFD code to simulate size changes in every numerical cell in the computational domain. The second approach uses flow field and properties of turbulence to construct a mechanistic model of suspension flow in the system. Such approach can be considered as an attractive alternative to CFD simulations, because it allows to greatly reduce time required to obtain the results, i.e., the final particle size distribution of the product. Based on experiments shattering breakage mechanism was identified. A comparison of the mechanistic model and full CFD does not deviate from each other. Therefore the application of a much faster mechanistic model has comparable accuracy with full CFD. The model of particle deagglomeration does not predict a very fast initial drop of particle size, observed in the experiment, but it can predict, with acceptable accuracy, the final particle size of the product.
Źródło:
Chemical and Process Engineering; 2021, 42, 2; 105-118
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric design and analysis of industrial dye mixing machines
Autorzy:
Ayaz Ümütlü, Hatice Cansu
Kıral, Zeki
Powiązania:
https://bibliotekanauki.pl/articles/140103.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
parametric design
computer-aided design
impeller modeling
simulation
Opis:
Structural design analyses of industrial dye mixing machines, concerning mixing impeller geometries, mixing performances, and power requirements aren’t generally of scientific quality. Our aim is to propose a practical method for minimizing execution time, using parametric design. In this study, Visual Basic API codes are developed in order to model the impellers in SolidWork,sup>R software, and then flow analyses are conducted. Thus, velocity values and moment/torque values required for mixing operation are determined. This study is carried out for different shaft rotational speeds and different impeller diameters. Flow trajectories are obtained. After that, frequency analyses are conducted and natural frequency values are obtained. In the scope of this study, two different impeller types are investigated.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 2; 211-227
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of models of gas bubble break-up causedby eddies generated by a self-aspirating disk impeller
Autorzy:
Stelmach, Jacek
Musowski, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/185375.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
self-aspirating disk impeller
bubble break-up
population balance model
samozasysający wirnik tarczowy
rozpad bańki
model równowagi populacji
Opis:
The paper presents a photographic analysis of the break-up of gas bubbles flowing out of the outletsof a self-aspirating disk impeller. It was found that bubbles detached from the interfacial surface mostoften disintegrate to form several daughter bubbles. Further in the work, the population balance modelwas verified for several formulas describing the bubble break-up rate. It has been found that a good fitto the experimental data is provided by the formula given by Laakkonen for 5 daughter bubbles. Thepossibility of using the Monte Carlo method to model the bubble break-up process was also determined.For this method, a good agreement of results was achieved for the division into a maximum of 10daughter bubbles. In the case of this method it was also found necessary to use the function of break-upfrequency at a higher rate for smaller bubbles.
Źródło:
Chemical and Process Engineering; 2020, 41, 1; 45--57
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Centrifugal compressor performance improvement through multi splitter impeller
Autorzy:
Malik, Adil
Zheng, Qun
Qureshi, Shafiq R.
Ahmed, Salman A.
Gambo, D. KB
Powiązania:
https://bibliotekanauki.pl/articles/258806.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
centrifugal compressor
back swept impeller
flow separation
efficiency
numerical simulation
Opis:
In the paper, a back swept impeller of centrifugal compressor is experimentally studied and numerically validated and modified to increase its pressure ratio and improve efficiency, as well as to analyse the effect of splitter blade location between two main blades. The back swept multi splitter blade impeller was designed with a big splitter positioned close to the main blade suction surface and a smaller splitter close to the pressure surface. Adding this multi splitter improves the overall performance of the modified impeller due to less intensive flow separation and smaller pressure loss. In particular, the total pressure ratio was observed to increase from 4.1 to 4.4, with one percent increase in efficiency.
Źródło:
Polish Maritime Research; 2019, 2; 6-14
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modelling of Metal Melt Refining Process in Ladle with Rotating Impeller and Breakwaters
Autorzy:
Sviželová, J.
Tkadlečková, M.
Michalek, K.
Walek, J.
Saternus, M.
Pieprzyca, J.
Merder, T.
Powiązania:
https://bibliotekanauki.pl/articles/353863.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium
refining
numerical modelling
rotating impeller
degassing
Opis:
The paper describes research and development of aluminium melt refining technology in a ladle with rotating impeller and breakwaters using numerical modelling of a finite volume/element method. The theoretical aspects of refining technology are outlined. The design of the numerical model is described and discussed. The differences between real process conditions and numerical model limitations are mentioned. Based on the hypothesis and the results of numerical modelling, the most appropriate setting of the numerical model is recommended. Also, the possibilities of monitoring of degassing are explained. The results of numerical modelling allow to improve the refining technology of metal melts and to control the final quality under different boundary conditions, such as rotating speed, shape and position of rotating impeller, breakwaters and intensity of inert gas blowing through the impeller.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 659-664
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie krzywych płynięcia sosów na bazie przecieru pomidorowego z dodatkiem wybranych cząstek o zróżnicowanej geometrii
Flow characteristics of tomato puree with the addition of large particles of various geometries
Autorzy:
Probola, G.
Warechowski, J.
Haponiuk, E.
Powiązania:
https://bibliotekanauki.pl/articles/2073352.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
lepkość
duże cząstki
konsystometr Bostwicka
przystawka zanurzeniowa
mieszadło vane
viscosity
coarse particles
Bostwick consistometer
bali measuring system
vane impeller
Opis:
Celem niniejszej pracy było sporządzenie charakterystyk płynięcia modelowych układów zawiesin spożywczych zawierających dodatek dużych cząstek stałych o różnym składzie i geometrii. Wykonano pomiary konsystencji na konsystometrach Bostwicka i rynnowym oraz pomiary właściwości Teologicznych na reometrach z przystawką zanurzeniową i z mieszadłem skrzydełkowym. Stwierdzono, że większą lepkość pozorną miał przecier pomidorowy z ryżem niż przeciery z makiem i sezamem, zaś w przypadku makaronów najmniejszy przyrost lepkości przecieru powodował dodatek najkrótszych, 5-milimetrowych kawałków makaronu.
The purpose of this work was to characterize the flow characteristics of model food suspension systems containing the addition of large solid particles, differing in composition and geometry. The consistency measurements were carried out using Bostwick and gutter consistometers, as well as measurements with the bali measuring system and vane impeller. It was found that tomato paste with rice particles showed greater apparent viscosity than puree with poppy seeds and sesame, and in the case of pasta the smallest increase of puree viscosity resulted in the addition of the shortest threads.
Źródło:
Inżynieria i Aparatura Chemiczna; 2018, 4; 114--115
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Naprężenia turbulentne w pobliżu mieszadła Rushtona
Turbulent stresses in the vicinity of Rushton impeller
Autorzy:
Stelmach, J.
Kuncewicz, Cz.
Powiązania:
https://bibliotekanauki.pl/articles/2073328.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mieszadło Rushtona
naprężenia turbulentne
PIV
Rushton impeller
turbulent stresses
Opis:
Przedstawiono wyniki pomiarów naprężeń turbulentnych powstających w cieczy w pobliżu mieszadła Rushtona. Stwierdzono, że naprężenia turbulentne osiągają największe wartości w pobliżu końców łopatek mieszadła. Poza niewielkim obszarem w pobliżu mieszadła wartości naprężeń turbulentnych szybko zmniejszają się.
The paper presents measurement results of turbulent stresses occurring in liquid near the Rushton impeller. It was found that turbulent stresses reached the highest values near impeller blades tips. Outside the small area near the impeller, the turbulent stresses values quickly decreased.
Źródło:
Inżynieria i Aparatura Chemiczna; 2018, 5; 150--151
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
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