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Wyszukujesz frazę "time mixing" wg kryterium: Temat


Tytuł:
Modified Resource-Constrained Project Scheduling to minimize idle time for Banbury mixing process: a case study in the tire manufacturing industry
Autorzy:
Butrat, Anan
Supsomboon, Srisawat
Powiązania:
https://bibliotekanauki.pl/articles/27315567.pdf
Data publikacji:
2023
Wydawca:
STE GROUP
Tematy:
RCPS
natural aging process
idle time
production scheduling
Banbury mixing process
Opis:
The Banbury mixing process (BMP) is to supplies the specific characteristic compounds for the tire manufacturing process. Idle time in the BMP was a problem caused by the aging process between mixing steps and the limited space for processing, measured in pallets. In this study, the resource-constrained project scheduling model (RCPS) is modified in case of the objective function and the input value of resource constraint to minimize idle time (SST). The complete minimization (Cmax) is changed from minimizing the starting time of the last job to the starting time of all jobs. In addition, the non-limited resource is defined as the input for the space capacity to reduce the idle time. As the results, the SST can provide the schedule that make less 5 time periods of idle time. Moreover, when considering the relationship between mixing and aging, aging process that is scheduled from SST starts immediately comparison to Cmax that some of aging process are not. Furthermore, the effect of the quantity of pallets was also examined. Although the non-limited resource does not make any delay to the schedule but the limited quantity is not. When pallets are limited, aging jobs were significantly impacted, with the last aging pallet being delayed. To reduce delays, it prepares an adequate supply of pallets that is close to or equal to its requirement that is defined by the non-limited resource. Further research combining the scheduling of the BMP with the tire manufacturing process and more techniques to modify RCPS are applied.
Źródło:
Management Systems in Production Engineering; 2023, 3 (31); 263--270
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sensitivity analysis of kinetic characterizations in continuous flotation circuits under moderate deviations with respect to perfect mixing
Autorzy:
Vinnett, Luis
Pino-Muñoz, Catalina A.
Yianatos, Juan
Díaz, Francisco
Henríquez, Felipe
Powiązania:
https://bibliotekanauki.pl/articles/2146941.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation kinetics
residence time distribution
perfect mixing
flotation rate distribution
industrial flotation circuit
Opis:
This paper studies the effect of moderate deviations with respect to perfect mixing on the estimated kinetic parameters in industrial flotation banks. Radioactive tracer tests and mass balance surveys were performed to characterize the mixing regimes and Cu kinetic responses. For three models (Single Rate Constant, Rectangular and Gamma), two approaches to incorporate the residence time distributions (RTD) in the kinetic characterizations of rougher banks were compared: (i) RTDs measured from the radioactive tracer tests; and (ii) pure perfect mixing in each flotation machine. The measured RTDs did not present significant bypass in the evaluated banks. In all cases, comparable model fitting was obtained with both RTD approaches, which indicates that the kinetic models add sufficient flexibility to compensate for moderate biases in the mixing regime. The studied kinetic models showed non-significant differences in the estimated maximum recoveries (R∞), mean (kmean) and median (k50) rate constants when comparing the process modelling from measured RTDs and pure perfect mixing. However, the Gamma model was more sensitive to the RTD assumption in terms of the shapes of the flotation rate distributions. From the results, kinetic characterizations focused only on model fitting, or on R∞ and kmean (or k50) estimations have low sensitivity to the assumption of perfect mixing when the RTDs present moderate deviations with respect to this regime. Special attention must be paid when characterizing floating components as the perfect mixing assumption may bias the shapes of the flotation rate distributions.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152420
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Image analysis framework for hydraulic mixing
Autorzy:
Golczak, Aleksandra
Szaferski, Waldemar
Woziwodzki, Szymon
Mitkowski, Piotr T.
Powiązania:
https://bibliotekanauki.pl/articles/2173414.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mieszanie hydrauliczne
przetwarzanie obrazu
analiza czasu mieszania
model kolorów RGB
hydraulic mixing
image processing
analysis of mixing time
RGB colour model
Opis:
This study is focused on the image analysis of motionless hydraulic mixing process, for which pressure changes were the driving force. To improve the understanding of hydraulic mixing, mixing efficiency was assessed with dye introduction, which resulted in certain challenges. In order to overcome them, the framework and methodology consisting of three main steps were proposed and applied to an experimental case study. The experiments were recorded using a camera and then processed according to the proposed framework and methodology. The main outputs from the methodology which were based only on the recorded movie were liquid heights and colour changes during the process time. In addition, considerable attention has also been given to issues related to other colour systems and the hydrodynamic description of the process.
Źródło:
Chemical and Process Engineering; 2022, 43, 1; 3--21
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agitation efficiency of different physical systems
Autorzy:
Karcz, Joanna
Szoplik, Jolanta
Major-Godlewska, Marta
Cudak, Magdalena
Kiełbus-Rąpała, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2086781.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
agitated vessel
power consumption
mixing time
heat and mass transfer
gas hold-up
wzburzony statek
pobór energii
czas mieszania
wymiana ciepła i masy
zatrzymywanie gazu
Opis:
Efficiency of agitation was considered for different physical systems on the basis of our own experimental studies on homogenisation, heat and mass transfer as well as gas hold-up. Measurements were performed for different physical systems: Newtonian liquids of low and higher viscosity, pseudoplastic liquid, gas–liquid and gas–solid–liquid systems agitated in vessels of the working volume from 0.02 m3 to 0.2 m3. Agitated vessels of different design were equipped with a high-speed impeller (10 impellers were tested). Comparative analysis of the experimental results proved that energy inputs (power consumption) should be taken into account as a very important factor when agitation efficiency is evaluated in order to select a proper type of equipment. When this factor is neglected in the analysis, intensification of the process can be estimated only.
Źródło:
Chemical and Process Engineering; 2021, 42, 2; 139--156
0208-6425
2300-1925
Pojawia się w:
Chemical and Process 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:
High flow, low shear impellers versus high shear impellers; dispersion of oil drops in water and other examples
Autorzy:
Pacek, Andrzej W.
Nienow, Alvin W.
Powiązania:
https://bibliotekanauki.pl/articles/2034043.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high shear
high flow descriptors
drop sizes
mixing time
bioprocessing
ścinanie
deskryptory wysokiego przepływu
rozmiar kropli
czas mieszania
bioprzetwarzanie
Opis:
Flow patterns generated by two ChemShear impellers, CS 2 and CS 4 have been measured and flow numbers calculated; Fl = 0.04 for both impellers. Transient and equilibrium drop sizes, d32 μm of 3 different viscosity silicone oils agitated by a high-shear Rushton turbine, RT, a low-shear, high-flow HE3 impeller and the two ChemShears were determined. The equilibrium d32 are correlated for all impellers, by d32 = 1300(εT )−0.58 max.svv0.14 with an R2 = 0.94. However, the time to reach steady state and the equilibrium size at the same specific power do not match the above descriptors of each impeller’s characteristics. In other literature, these descriptors are also misleading. In the case of mixing time, a high shear RT of the same size as a high flow HE3 requires the same time at the same specific power in vessels of H/T = 1. In bioprocessing, where concern for damage to cells is always present, free suspension animal cell culture with high shear RTs and low-shear impellers is equally effective; and with mycelial fermentations, damage to mycelia is greater with low shear than high. The problems with these descriptors have been known for some time but mixer manufacturers and ill-informed users and researchers continue to employ them.
Źródło:
Chemical and Process Engineering; 2021, 42, 2; 77-90
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of a mixing process induced by a rotating magnetic field with the application of magnetic particles
Autorzy:
Rakoczy, Rafał
Kordas, Marian
Markowska-Szczupak, Agata
Konopacki, Maciej
Augustyniak, Adrian
Jabłońska, Joanna
Paszkiewicz, Oliwia
Dubrowska, Kamila
Story, Grzegorz
Story, Anna
Ziętarska, Katarzyna
Sołoducha, Dawid
Borowski, Tomasz
Roszak, Marta
Grygorcewicz, Bartłomiej
Dołęgowska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/2086782.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mixing process
alternating magnetic field
magnetic particles
mixing time
Navier–Stokes equation
proces mieszania
zmienne pole magnetyczne
cząstki magnetyczne
czas mieszania
równanie Naviera-Stokesa
Opis:
We demonstrate in this study that a rotating magnetic field (RMF) and spinning magnetic particles using this kind of magnetic field give rise to a motion mechanism capable of triggering mixing effect in liquids. In this experimental work two mixing mechanisms were used, magnetohydrodynamics due to the Lorentz force and mixing due to magnetic particles under the action of RMF, acted upon by the Kelvin force. To evidence these mechanisms, we report mixing time measured during the neutralization process (weak acid-strong base) under the action of RMF with and without magnetic particles. The efficiency of the mixing process was enhanced by a maximum of 6.5% and 12.8% owing to the application of RMF and the synergistic effect of magnetic field and magnetic particles, respectively
Źródło:
Chemical and Process Engineering; 2021, 42, 2; 157--172
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling language extinction using Susceptible-Infectious-Removed (SIR) model
Autorzy:
Ikoba, N. A.
Jolayemi, E. T.
Powiązania:
https://bibliotekanauki.pl/articles/1186921.pdf
Data publikacji:
2019-12-10
Wydawca:
Główny Urząd Statystyczny
Tematy:
language extinction
stochastic epidemic model
non-homogeneous mixing
quasi-stationary distribution
time in which a language is expected to be extinct
Opis:
The study presents a stochastic epidemic model applied to the model of indigenous language extinction. The Susceptible-Infectious-Removed (SIR) categorization of an endemic disease has been reformulated to capture the dynamics of indigenous language decline, based on the assumption of non-homogeneous mixing. The time in which an indigenous language is expected to be extinct was derived using a modified SIR model with the population segmented into several sub-communities of small sizes representing family units. The data obtained from the 2016 indigenous language survey conducted in several parts of Nigeria and from the 2013 Nigeria Demographic Health Survey (NDHS) were used to estimate the key parameters of the model for Nigeria’s several indigenous languages. The parameters of interest included the basic reproduction number, the threshold of endemicity, and the time in which a language is expected to be extinct, starting from the endemic level. On the basis of the time in which a language is expected to be extinct, several of the surveyed languages appeared to be in a precarious condition, while others seemed virile, thanks to a high language transfer quotient within families.
Źródło:
Statistics in Transition new series; 2019, 20, 4; 71-87
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of mixing time in liquid under influence of rotating magnetic field
Autorzy:
Przybył, A.
Rakoczy, R.
Konopacki, M.
Kordas, K.
Drozd, R.
Fijałkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/185725.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rotating magnetic field
mixing time
hydrodynamics
mixing effect
obracanie pola magnetycznego
czas mieszania
hydrodynamika
efekt mieszania
Opis:
The aim of the study was to present an experimental investigation of the influence of the RMF on mixing time. The obtained results suggest that the homogenization time for the tested experimental set-up depending on the frequency of the RMF can be worked out by means of the relationship between the dimensionless mixing time number and the Reynolds number. It was shown that the magnetic field can be applied successfully to mixing liquids.
Źródło:
Chemical and Process Engineering; 2017, 38, 4; 555-565
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Hydrodynamic Structure on Mixing Time of Alloy Additions with Liquid Steel in One Strand Tundish
Autorzy:
Cwudziński, A.
Powiązania:
https://bibliotekanauki.pl/articles/351025.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tundish
hydrodynamics structure
RTD curves
time mixing
numerical modeling
Opis:
The knowledge of the hydrodynamic pattern aids in designing new and modernizing existing tundishes. The device under examination is an one-strand tundish of a capacity of 30 Mg. Computer simulation of the liquid steel flow, tracer and alloy addition behaviour in turbulent motion conditions was done using the Ansys-Fluent® computer program. The hydrodynamic conditions of steel flow were determined based on the distribution of the characteristics of tundish liquid steel residence time distribution (RTD). The alloy addition was introduced to the liquid steel by the pulse-step method. Based on computer simulations carried out, steel flow fields and RTD and mixing curves were obtained, and the shares of stagnant volume flow and active flow and the mixing time were computed. Dispersion of the alloy addition in liquid steel during its flow through the tundish is a dynamic process which is determined by the hydrodynamic conditions occurring in the tundish working space.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 295-300
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania hydrodynamiki w kolumnie air-lift z zewnetrzna cyrkulacja płynu
The study of airlift reactor hydrodynamics
Autorzy:
Szoplik, J.
Stelmasińska, P.
Powiązania:
https://bibliotekanauki.pl/articles/2073122.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
kolumna air-lift
cyrkulacja zewnętrzna
czas mieszania
udział gazu zatrzymanego w cieczy
external-loop airlift reactor
mixing time
gas hold-up
Opis:
Analizowano udział gazu zatrzymanego w cieczy w strefie wznoszenia i opadania, prędkość cieczy w strefie wznoszenia i opadania oraz czas mieszania w kolumnie air-lift z zewnętrzną cyrkulacją płynu. Badano układy woda-powietrze oraz roztwór gliceryny-powietrze dla różnych objętościowych strumieni powietrza. Wykazano, że w zakresie przeprowadzonych pomiarów typ układu ciecz-gaz miał wpływ na prędkość cieczy w strefie wznoszenia i opadania oraz czas mieszania, a nie wpływał istotnie na wielkość udziału gazu zatrzymanego w cieczy.
The gas hold-up and liquid velocity in a riser and downcomer as well as mixing time in the external-loop airlift reactor were analyzed. Two systems: air – water and air – glycerol in water solution for various volumetric gas flow rates were investigated. It was proved that in the range of performed measurements a type of gas – liquid phase affects the liquid velocity in a riser and downcomer and mixing time but does not significantly affects gas hold-up.
Źródło:
Inżynieria i Aparatura Chemiczna; 2015, 6; 360--361
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study and mathematical modeling of the residence time distribution in magnetic mixer
Autorzy:
Rakoczy, R.
Kordas, M.
Grądzik, P.
Konopacki, M.
Story, G.
Powiązania:
https://bibliotekanauki.pl/articles/778204.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
mixing model
residence time distribution
modelling
magnetic field
Opis:
This study reports on research results in the field of a mixing process under the action of a transverse rotating magnetic field (TRMF). The main objective of this paper is to present the effect of this type of a magnetic field on residence time distribution (RTD) measurements. This paper evaluates the performance of a magnetic mixer by comparing the results of an experimental investigations in a pilot set-up and theoretical values obtained from mathematical model. This model consisting of the set of ideal continuous stirred tank reactors (CSTR) fitted well the experimental data.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 2; 53-60
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Correlation Using Four Wave Mixing in a Highly Nonlinear Fibre for Real-Time Serialized Ultrafast Systems
Autorzy:
Shalihah, F.
Mitchell, A.
Bui, L.
Powiązania:
https://bibliotekanauki.pl/articles/226196.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
broadband
Dispersive Fourier Transform
four wave mixing
nonlinearity
optical correlation
Optical Signal Processing
Real-Time Ultrafast Systems
Opis:
A method of all-optical correlation is proposed using the nonlinear phenomena Four Wave Mixing (FWM) of two different signals. The method shows a serial solution where correlation of an ultrafast real-time serialized broadband source is demonstrated using a Highly Non-Linear Fibre (HNLF) with correlation rate reaching 200MHz.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 3; 207-212
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie sposobów zwiększenia efektywności mieszania płynów lepkich w mieszalniku z dwoma mieszadłami
Comparison of methods for increasing the efficiency of viscous fluids mixing in a vessel with the dual impeller
Autorzy:
Woziwodzki, S.
Broniarz-Press, L.
Jędrzejczak, Ł
Zaworska, K
Powiązania:
https://bibliotekanauki.pl/articles/2072553.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mieszanie
forward-reverse
niecentryczność
segregacja
czas mieszania
mixing
eccentricity
segregation
mixing time
Opis:
W pracy podjęto próbę porównania efektywności mieszania w mieszalniku z niecentrycznie umiejscowionymi mieszadłami oraz w mieszalniku z mieszadłami wykonującymi ruch oscylacyjny typu forward-reverse. Stwierdzono, iż stopień segregacji maleje wraz ze wzrostem czasu mieszania. Porównanie czasów mieszania dla obu sposobów mieszania pozwala stwierdzić, iż najmniejszy czas mieszania uzyskano dla układów RT-RT i RT-PBT (forward-reverse, Re= 9 i 29) oraz dla układu PBT-PBT (układ niecentrycz- ny, Re = 40). Wyższa efektywność mieszania typu forward-reverse zanika dla Re > 40.
In the work an attempt was undertaken to compare the mixing effectiveness of in a vessel with eccentrically located impellers and in a vessel with impelers performing oscillatory (forward-reverse) motion. The results showed that fourfold increase in frequency causes the decrease of mixing time. Comparison of mixing time periods leads to the conclusion that the smallest mixing time was achieved for the RT-RT and RT-PBT systems (forwardreverse, Re = 9 and 29) and for the PBT-PBT system (eccentric system, Re = 40). A higher efficiency of forward-reverse mixing in comparison the eccentric system disappears for Re > 40.
Źródło:
Inżynieria i Aparatura Chemiczna; 2013, 4; 378--379
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ dodatku soli na czas mieszania w roztworach polimerów
Influence of salt additive on mixing time in polymer solutions
Autorzy:
Różańska, S.
Broniarz-Press, L.
Powiązania:
https://bibliotekanauki.pl/articles/2071056.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
czas mieszania
polielektrolit
metoda optyczna
współczynnik rozpraszania energii
mixing time
polyelectrolyte
optical method
energy dissipation coefficient
Opis:
W pracy przedstawiono wyniki badań doświadczalnych czasu mieszania w wodnych roztworach polimerów jonowych i niejonowych (soli sodowej karboksymctylocelulozy, częściowo zhydrolizowanego poHakryloamidu oraz gumy guar) w czystej wodzie i z dodatkiem soli (NaCl). Czas mieszania wyznaczano za pomocą opracowanej w tym celu metody optycznej. Analiza danych Teologicznych wykazała, że dodatek soli powoduje obniżenie lepkości roztworów polielektrolitów, co wpływa na skrócenie czasu mieszania.
The paper deals with experimental studies on the determination of mixing time for ionic and non-ionic polymer solutions (carboxymetyhylcellulose sodium salt, partially hydrolyzed polyacrylamide and guar gum) in clear water and with salt additives. The optical method was applied to evaluate mixing time in fluids studied. Analysis of rhcological data showed that salt causes a decrease of viscosity of polyelectrolyte solutions, what as a result influences mixing time shortening.
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 1; 95-96
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł

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