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Wyświetlanie 1-15 z 162
Tytuł:
Influence of rotating magnetic field on gas-liquid volumetric mass transfer coefficient
Autorzy:
Rakoczy, R.
Konopacki, M.
Kordas, M.
Powiązania:
https://bibliotekanauki.pl/articles/185156.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mass transfer
volumetric mass transfer coefficient
rotating magnetic field
transfer masy
wolumetryczny współczynnik przenikania masy
obracanie pola magnetycznego
Opis:
The main objective of these experiments was to study the oxygen mass transfer rate through the volumetric mass transfer coefficient (kLa) for an experimental set-up equipped with a rotating magnetic field (RMF) generator and various liquids. The experimental results indicated that kLa increased along the magnetic strength and the superficial gas velocity. Mathematical correlations defining the influence of the considered factors on kLa were proposed.
Źródło:
Chemical and Process Engineering; 2017, 38, 3; 423-432
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania współczynnika wnikania masy w procesie mieszania z napowietrzaniem wody
The studies on mass transfer coefficient in the mixing process with aeration
Autorzy:
Ochowiak, M.
Broniarz-Press, L.
Kaczmarek, A.
Kujawa, N.
Powiązania:
https://bibliotekanauki.pl/articles/229012.pdf
Data publikacji:
2013
Wydawca:
Wyższa Szkoła Menedżerska w Warszawie
Tematy:
wnikanie masy
mieszanie
współczynnik wnikania masy
mieszadło
natlenianie
mass transfer
mixing
mass transfer coefficient
stirrer
oxygenation
Opis:
W artykule przedstawiono wyniki badań doświadczalnych współczynnika wnikania masy w procesie mieszania cieczy mieszadłem turbinowym Rushtona oraz mieszadłem śmigłowym z jednoczesnym napowietrzaniem. Wykazano, że mieszadło śmigłowe nadaje się bardziej do rozprowadzania tlenu przy niższych wartościach częstości obrotowych mieszadła. Turbina Rushtona lepiej rozprowadzała tlen przy większych wartościach częstości obrotów.
The paper presents results of experimental studies on the volumetric mass transfer coefficient for two types of impellers (Rushton turbine and propeller stirrer) in the mixing process with the aeration. It has been shown that propeller stirrer is more suitable for a distribution of oxygen at lower rotation speeds. It appeared that the Rushton turbine distributes oxygen better at the higher rotation of speeds.
Źródło:
Postępy Techniki Przetwórstwa Spożywczego; 2013, 1; 88-91
0867-793X
2719-3691
Pojawia się w:
Postępy Techniki Przetwórstwa Spożywczego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heat and mass transfer in an adsorption bed using CFD methods
Autorzy:
Janusz, Szymon
Szudarek, Maciej
Rudniak, Leszek
Borcuch, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/27312232.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
heat transfer
adsorption
CFD
mass transfer
refrigeration devices
Opis:
The trend of reducing electricity consumption and environmental protection has contributed to the development of refrigeration technologies based on the thermal effect of adsorption. This article proposes a methodology for conducting numerical simulations of the adsorption and desorption processes. Experimental data available in the literature were used as guidelines for building and verifying the model, and the calculations were carried out using commercial computational fluid dynamics software. The simulation results determined the amount of water vapor absorbed by the adsorbent bed and the heat generated during the adsorption process. Throughout the adsorption process, the inlet water vapor velocity, temperature, and pressure in the adsorbent bed were monitored and recorded. The results obtained were consistent with the theory in the literature and will serve as the basis for further, independent experimental studies. The validated model allowed for the analysis of the effect of cooling water temperature on the sorption capacity of the material and the effect of heating water temperature on bed regeneration. The proposed approach can be useful in analyzing adsorption processes in refrigeration applications and designing heat and mass exchangers used in adsorption systems.
Źródło:
Archives of Thermodynamics; 2023, 44, 2; 177--194
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Solubility and Mass Transfer Coefficient of Benzoic Acid Through Hydrotropy
Autorzy:
Prakash, G.D.
Kumar, S.T.
Gandhi, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/779266.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
hydrotropy
solubilization
mass-transfer coefficient
benzoic acid
Opis:
The effect of hydrotropes such as sodium salicylate, sodium benzoate, and nicotinamide on the solubility and mass transfer coefficient of benzoic acid has been investigated. The solubility studies were carried out under a wide range of hydrotrope concentrations (0 to 3.0 mol/L) and different system temperatures (303K to 333K). It has been observed that the solubility and mass transfer coefficient of benzoic acid increases with an increase in hydrotrope concentration and also with system temperature. A Minimum Hydrotrope Concentration (MHC) was found essential to initiate a significant increase in the solubility and the mass transfer coefficient. The maximum enhancement factor (?s), which is the ratio of the solubility value in the presence and absence of a hydrotrope, has been determined for all sets of experimentations. The solubility of benzoic acid has been enhanced to 19.98 times in the presence of 2.5 mol/L concentration of sodium salicylate hydrotrope at 333K.The effectiveness of hydrotropes was measured in terms of Setschenow constant Ks and the highest value has been observed as 0.502 for sodium salicylate.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 1; 46-50
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie przenoszenia ciepła i masy w chłodziarkach adsorpcyjnych
Research on heat and mass transfer in adsorption chillers
Autorzy:
Gwadera, M.
Kupiec, K.
Powiązania:
https://bibliotekanauki.pl/articles/2072830.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
chłodziarki adsorpcyjne
przenoszenie masy
adsorption chillers
mass transfer
Opis:
W pracy przedstawiono wyniki badań doświadczalnych dotyczących adsorpcji w ziarnach adsorbentu naniesionych na powierzchnię rurki metalowej. Taka konstrukcja jest stosowana w adsorpcyjnych urządzeniach chłodniczych. Badania prowadzono w układzie silikażel – para wodna. Stosowano różne natężenia przepływu fazy gazowej i różne wielkości ziaren. Stwierdzono znaczny wpływ prędkości przepływu fazy gazowej na przebieg procesu.
The experimental study results on adsorption in adsorbent pellets spread directly on a metal pipe surface are presented in the paper. Such construction is used in adsorption chillers. A silica gel - water vapour system was studied. Different gas phase flow rates and different sizes of silica gel pellets were used. It was found that gas phase velocity significantly influenced the process.
Źródło:
Inżynieria i Aparatura Chemiczna; 2014, 4; 245--246
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of Dead Zones Generated in Bioreactors as a Proactive Stage in Bioreactor Design
Autorzy:
Al-Mashhadani, Mahmood K. H.
Powiązania:
https://bibliotekanauki.pl/articles/24201743.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
bioreactor
dead zone
flow pattern
mass transfer
modeling
Opis:
The activity and growth of microorganisms for renewable energy production are still influenced by the dead zones created in bioreactors. These areas form a nutrient and thermal gradient, causing an abundance of food in certain areas compared to famines in other areas of same bioreactor. The current study is a step in identifying those dead zones, followed by another step in improving the flow of media inside the reactor. The results indicated that the inner parts of the bioreactor may be a crucial factor in the creation and spread of such dead zones. For example, the position of the disc-type diffuser contributes to the generation of those areas at the bottom of the reactor. It was inferred from the fluid movement in reactors using the annular-type diffuser proposed in the current study. The bubble size, gas mass flux, and radiuses of fillet, as the most important factors, were examined in both bioreactors. The results revealed a noticeable improvement in these parameters in this area of the reactor when the disc diffuser was replaced by the annular diffuser. For example, the average liquid velocity was recorded in the lower part of the modernized reactor at 0.0198 m/s, while the velocity was recorded in the conventional reactor at 0.00077 m/s under same bubbles diameter used in both reactors (0.125 mm). The inclusion of the effect of the presence of microorganisms in mathematical models was also addressed in the current study. The results showed that the amount of oxygen remaining at the bottom of the reactor after bio-consumption in the presence of the annular diffuser was higher than that in the conventional reactor. This clearly emphasizes the importance of the design of the internal parts of the bioreactor.
Źródło:
Journal of Ecological Engineering; 2023, 24, 6; 65--74
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using an Interdigital Micromixer for Separation of In3+ from Zinc Hydrometallurgical Process with D2EHPA as an Extractant
Autorzy:
Li, C.
Jiang, F.
Ju, S.
Peng, J.
Wei, Y.
Zhang, L.
Powiązania:
https://bibliotekanauki.pl/articles/356090.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interdigital micromixer
solvent extraction
mass transfer coefficient
indium
stripping
Opis:
Experiments were performed in an interdigital micromixer with 30 microchannels (40 μm width of each channel) to separate In3+, Fe3+ and Zn2+ from sulfate solutions using Di-(2-ethylhexyl)phosphoric acid (D2EHPA) as the extractant. The effects of pH, extractant concentration and flow rate on the extraction efficiency and flow rate on mass transfer coefficient of In3+, Fe3+ and Zn2+ were investigated. At a phase flow rate of 7.0 mL/min and initial solution pH of 0.423, the extraction efficiency of In3+, Fe3+ and Zn2+ was 99.29%, 3.43% and 2.54%, respectively and mass transfer coefficient of In3+, Fe3+ and Zn2+ was 144.307 s-1,1.018 s-1 and 0.750 s-1. Then, the loaded organic phase was stripped in an interdigital micromixer. At a phase flow rate of 9.0 mL/min and HCl concentration of 160 g/L, stripping efficiency of In3+ was 98.92% and mass transfer coefficient of In3+ was 169.808 s-1, while concentration of Fe3+ and Zn2+ was lower than 0.005 g/L with good separation of In3+ from Fe3+ and Zn2+.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 873-878
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and mass transfer mechanism on three-dimensional flow of inclined magneto Carreau nanofluid with chemical reaction
Autorzy:
Rao, B. Madhusudhana
Gopal, Degavath
Kishan, Naikoti
Ahmed, Saad
Prasad, Putta Durga
Powiązania:
https://bibliotekanauki.pl/articles/240005.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carreau nanofluid
chemical reaction
MHD
heat and mass transfer
Opis:
The characteristic of nano sized particles mass flux conditions are engaged in this investigation. Here we assume that the nano sized particle flux is zero and the nano sized particle fraction arranged itself on the boundary layer. With this convincing and revised relation, the features of Buongiorno relation on three-dimensional flow of Carreau fluid can be applied in a more efficient way. The governing partial differential equations of continuity, momentum, energy and concentration equations which are transmitted into set of pair of nonlinear ordinary differential equations utilizing similar transformations. The numeric solutions are acquired by engaging the bvp4c scheme, which is a finite-difference code for solving boundary value problems. A parametric study is accomplished to demonstrate the impact of Prandtl number, Weissenberg numbers, radiation parameter, chemical reaction parameter, thermophoresis parameter, Brownian motion parameter and Lewis number on the fluid velocity, temperature and concentration profiles as well skin friction coefficient, Nusselt number and Sherwood number within the boundary layer. From this we find the way in which magnetic parameter contributes to the increase in local skin fraction, and the decrease in the Nusselt and Sherwood numbers in these cases. The effects of the velocity temperature and concentration profile are obtained and presented graphically.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 223-238
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Specific Heat Flux During Boiling of the Dispersed Phase of the Emulsion
Autorzy:
Pavlenkо, Anatoliy
Koshlak, Hanna
Basok, Borys
Hrabova, Tatiana
Powiązania:
https://bibliotekanauki.pl/articles/27315739.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
steam explosion
homogenisation
boiling
intensification of heat
mass transfer
Opis:
The intensity of heat exchange between the boiling emulsion and the enclosing surfaces is associated with the physical phenomena of the formation, growth, and destruction of vapour bubbles of the low-boiling component in the liquid phase. This article presents a methodology to assess the intensity of heat exchange processes. Using this technique, it is possible to predict the energy parameters of heat exchange equipment and the degree of intensification of heat transfer processes.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 16--24
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental evaluation of a helical laboratory photobioreactor for cultivation of thermophilic cyanobacteria – hydrodynamics and mass transfer studies
Autorzy:
Gluszcz, P.
Klepacz-Smółka, A.
Ledakowicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/185328.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photobioreactor
hydrodynamics
mass transfer
microalgae
thermophilic cyanobacteria
fotobioreaktor
hydrodynamika
transfer masy
mikroalgi
Opis:
The aim of the paper is to present the hydrodynamic, mass transfer and illumination characteristics of a laboratory helical-tube photobioreactor Biostat PBR-2S, commercially available and used in many laboratories in Poland and worldwide. The investigated hydrodynamics parameters were: mean liquid circulation rate, liquid velocity/residence time in the tubular part of the apparatus and mixing time, measured in the wide range of rotary speed of the circulation pump. The influence of the aeration intensity on these parameters was also checked. The volumetric oxygen and carbon dioxide transfer coefficients in the liquid phase and their dependency on the liquid circulation rate and gas inflow rate were determined. The experiments were performed in tap water and then in a real three-phase cultivation broth at the end of thermophilic cyanobacteria T. synechococus growth. For the final evaluation of the tested PBR there were series of test cultivations run under different conditions of illumination. The highest final concentration of the biomass of tested cyanobacteria reached the relatively high value of 4.38 g/dm3 of the dry biomass, although the process conditions were not fully optimized. The laboratory photobioreactor PBR-2S proved to be a good tool for investigations of microalgae cultivation processes. The presented results and practical observations may help to analyze and understand the mutual influence of the specific process parameters in the described PBR, especially during autotrophic organism cultivations.
Źródło:
Chemical and Process Engineering; 2018, 39, 4; 457--473
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chebyshev Spectral Collocation Method to Micropolar Fluid Flow through a Porous Channel driven by Suction/Injection with High Mass Transfer
Autorzy:
Jayesimi, L. O.
Sobamowo, M. G.
Akinshilo, A. T.
Waheed, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/1030143.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Chebyshev spectral collocation method
Mass Transfer
Micropolar fluids
Porous media
Opis:
This paper presents the application of Chebyshev spectral collocation method to flow analysis of a micropolar fluid conveyed through porous channel driven by suction or injection with high mass transfer. Effects of flow and rotation parameters such as Reynolds number and micro rotation parameters on the flow characteristics of the micropolar fluid are investigated using the developed approximate analytical solutions through the method. Comparing the results of the numerical solutions obtained in this study with the other results of the other methods in literature, very good agreements are established. The results obtained from this work can be used to further the study of the behavior of micropolar fluids in applications such as lubricants, blood flow porous media, micro channels and flow in capillaries.
Źródło:
World Scientific News; 2020, 143; 39-52
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On one analytical solution of the mass transfer problem in multistage installations with constant cut numbers
Autorzy:
Sulaberidze, G. A.
Borisevich, V. D.
Guliev, D. Zh.
Powiązania:
https://bibliotekanauki.pl/articles/346985.pdf
Data publikacji:
2003
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
multicomponent isotope mixture
separation cascade
cut number
mass transfer regularities
Opis:
Separation of binary isotope mixtures in multistage installations consisting of separation elements with constant cut numbers and separation factors is considered. The analytical solution for component concentration distributions over a cascade with constant cut numbers is obtained. Major mass transfer regularities in such a kind of cascades are reviewed.
Źródło:
Ars Separatoria Acta; 2003, 2; 7-17
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efektywność wnikania masy dla mieszadeł samozasysających
Efficiency of mass penetration for self-sucking mixers
Autorzy:
Stelmach, J.
Rzyski, E.
Powiązania:
https://bibliotekanauki.pl/articles/289329.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
efektywność
masa
mieszadło
współczynnik wnikania masy
efficiency
mass
mixer
mass transfer coefficient
Opis:
Celem niniejszej pracy jest określenie (na podstawie wartości współczynnika wnikania masy przypadającego na jednostkę mocy mieszania, kL/PG) optymalnych warunków pracy samozasysającego mieszadła tarczowego. Metodą fotograficzną określono w pracy wymiary pęcherzyków gazu oraz powierzchnię międzyfazową układu i na podstawie pomiarów objętościowego współczynnika wnikania masy przedstawiono efektywność pracy mieszadła. Dla badanego typu mieszadła wartości współczynników wnikania masy ustalają się począwszy od wartości Fr’≈0,4. W przypadku roztworu elektrolitu (NaCl) efektywność wnikania masy jest nieco mniejsza niż w przypadku cieczy - nieelektolitów (woda, roztwór rokrysolu).
The aim of this study is to determine optimum operating conditions for a self-aspirating disk impeller on the basis of mass transfer coefficient per unit of mixing power, kL/PG. Gas bubble sizes and interfacial area of the system were calculated using a photographic method and the impeller operation efficiency was presented on the basis of measurements of the volumetric mass transfer coefficient. For the tested impeller, the values of mass transfer coefficient are settled starting from Fr'≈0.4. In the case of electrolyte solution (NaCl), the mass transfer efficiency is slightly lower than in the case of liquids being non-electrolytes, e.g. water and rokrysol solution.
Źródło:
Inżynieria Rolnicza; 2005, R. 9, nr 9, 9; 329-337
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of mass transfer in annular gas-liquid flow in a microreactor
Autorzy:
Sobieszuk, P.
Napieralska, K.
Powiązania:
https://bibliotekanauki.pl/articles/185266.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mass transfer
annular flow
microreactor
masa transferu
przepływ pierścieniowy
mikroreaktor
Opis:
The paper presents an investigation of mass transfer in gas-liquid annular flow in a microreactor. The microreactor had a meandered shape with a square cross-section of the channel (292×292 μm, hydraulic diameter 292 μm) and 250 mm in length. The rate of CO2 absorption from the CO2/N2 mixture in NaOH (0.1 M, 0.2 M, 0.7 M, 1.0 M and 1.5 M) water solutions was measured. Two velocities of gas flow and two velocities of liquid flow were used. In two cases a fully developed annular flow at the beginning of the channel was observed, whilst in two cases annular flow was formed only in about 2/3 of the microchannel length. Based on the measurements of CO2 absorption rate, the values of volumetric liquid – side mass transfer coefficients with the chemical reaction were determined. Then physical values of coefficients were found. Obtained results were discussed and their values were compared with the values predicted by literature correlations.
Źródło:
Chemical and Process Engineering; 2016, 37, 1; 55-64
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing of efficiency of the cooling duct by modification of its geometry
Autorzy:
Kiedrzyński, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/240839.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
duct electrochemical limiting current technique
ELDCT
heat mass transfer
efficiency
Opis:
Increasing of the efficiency of convective cooling of the inner surface of a short duct by changing its geometry was studied by the use of electrochemical limiting current technique (ELDCT). The duct consisted of seven identical, cylindrical segments. The changes of the duct geometry were obtained by mutual displacement of neighbouring segments, towards the radial direction. Mean values of the mass transfer coefficient for each segment and friction losses for the whole channel were measured for Reynolds numbers spanning the range 7700–35300 at the five values of displacement parameter. The results were used for estimation of cooling efficiency. Recommended values of displacement were determined to point the favourable conditions of heat/mass transfer in the duct. The results may be used, e.g. in the design of heat exchangers and channels for cooling of turbine blades and electronic equipment.
Źródło:
Archives of Thermodynamics; 2020, 41, 3; 103-123
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
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