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Items from 1 to 20 out of 157 results

article

Agitation efficiency of different physical systems

Karcz, Joanna, Szoplik, Jolanta, Major-Godlewska, Marta, Cudak, Magdalena, more

Chemical and Process Engineering > 2021 > 42 > 2

article

Agitation efficiency of different physical systems

Joanna Karcz, Jolanta Szoplik, Marta Major-Godlewska, Magdalena Cudak, more

Chemical and Process Engineering > 2021 > Vol. 42, nr 2 > 139–-156

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...

article

The effect of vessel scale on gas hold-up in gas-liquid systems

Magdalena Cudak

Chemical and Process Engineering > 2020 > Vol. 41, nr 4 > 241–-256

The aim of the research presented in this paper was to determine the effect of vessel scale on gas hold- up in gas-liquid systems. The agitated vessel with internal diameters of T = 0:288 m and T = 0:634 m was filled with a liquid up to the height H = T. For the purpose of measurements, two high-speed impellers were used: Rushton turbine impeller (RT) or A 315 impeller.Within the study, the following...

article

The effect of vessel scale on gas hold-up in gas-liquid systems

Cudak, Magdalena, Cudak, Magdalena

Chemical and Process Engineering > 2020 > 41 > 4

article

Hydrodynamics and mass transfer in miniaturized bubble column bioreactors

Sirwan Khanchezar, Sameereh Hashemi-Najafabadi, Seyed Abbas Shojaosadati, Valiollah Babaeipour

Bioprocess and Biosystems Engineering > 2019 > 42 > 2 > 257-266

Miniaturized bubble columns (MBCs) have different hydrodynamics in comparison with the larger ones, but there is a lack of scientific data on MBCs. Hence, in this study, the effect of gas hold-up, flow regimes, bubble size distribution on volumetric oxygen mass transfer coefficient at different pore size spargers and gas flow rates in MBCs in the presence and absence of microorganisms were investigated...

article

Experimental study and CFD simulation of the multiphase flow conditions encountered in a Novel Down-flow bubble column

Mutharasu L.C., Dinesh V. Kalaga, Mayur Sathe, Damon E. Turney, more

Chemical Engineering Journal > 2018 > 350 > C > 507-522

The present work reports the experimental and CFD investigations of a Novel Down-flow bubble column to understand the flow characteristics. A novel mechanism of gas-liquid injection has been used to generate a high concentration of micro-bubbles with uniform distribution in a column of large cross-section (0.3 m diameter). Gas hold-up is obtained using three different measurement techniques: Phase...

article

Numerical analysis of hydrodynamics in a mechanically agitated gas–liquid pseudophase system

Magdalena Cudak

Chemical Papers > 2019 > 73 > 2 > 481-489

The paper presents the results of numerical simulations of hydrodynamics in a gas–liquid pseudophase system (sucrose solution with yeast suspension). The simulations were performed in a bioreactor with a working volume of 0.02 m³, equipped with a Rushton turbine or Smith turbine stirrers. The results of the study were developed in the form of vectors of liquid velocity and the contours of the analyzed...

article

Udział gazu zatrzymanego w cieczy dla układu gaz-ciecz w mieszalniku z dwoma mieszadłami

M. Cudak

Inżynieria i Aparatura Chemiczna > 2018 > Nr 4 > 93--94

Badania miały na celu określenie wpływu wybranych parametrów (natężenia przepływu gazu, częstości obrotów mieszadła, stężenia wodnego roztworu sacharozy oraz konfiguracji mieszadeł) na udział gazu zatrzymanego w cieczy dla układu gaz-ciecz. Badania wykonano w mieszalniku o średnicy 0,288 m z dwoma mieszadłem szybkoobrotowym. Wyniki badań opracowano w postaci równania. Na podstawie przeprowadzonych...

article

Mieszanie gaz-ciecz w mieszalniku z asymetrycznym mieszadłem BT-6

S. Frankiewicz, S. Woziwodzki

Inżynieria i Aparatura Chemiczna > 2018 > Nr 3 > 59--60

Przedstawiono badania mieszania układu ciecz-gaz w mieszalniku zaopatrzonym w zmodyfikowane mieszadło BT-6. Analizowano zapotrzebowanie mocy mieszania, stopień zatrzymania gazu oraz objętościowy współczynnik wnikania masy. Dla układów gaz-ciecz przebieg zmian względnej mocy mieszania był porównywalny z mieszadłem BT-6, jednakże spadek mocy mieszania był większy. W pracy zaproponowano również równania...

article

Hydrodynamic study of two phase flow of column flotation using electrical resistance tomography and pressure probe techniques

Balraju Vadlakonda, Narasimha Mangadoddy

Separation and Purification Technology > 2017 > 184 > C > 168-187

Gas dispersion characteristics are very important to design and selection of flotation process for the fine particle separation. Although the separation of flotation process heavily depends on hydrophobicity of given solid particles, but their rate of attachment and detachment depends on local gas dispersion characteristics. In this work, gas dispersion characteristics in a 100mm laboratory column...

article

Prediction of the gas hold-up in a large-diameter bubble column with liquid mixtures and electrolytes

Giorgia De Guido, Laura Annamaria Pellegrini

Chemical Engineering Research and Design > 2017 > 124 > C > 283-298

Many correlations are available in the literature for computing the gas hold-up in bubble columns, mainly in pure liquids. Contrarily, very few works deal with the gas hold-up in liquid mixtures, giving different opinions about the successful application of Andrew’s dynamic surface tension model. This work further investigates this topic using more recent gas hold-up data presented in a previous work...

article

Computational fluid dynamics simulation of a novel bioreactor for sophorolipid production

Xiaoqiang Jia, Lin Qi, Yaguang Zhang, Xue Yang, more

Chinese Journal of Chemical Engineering > 2017 > 25 > 6 > 732-740

This paper describes three-dimensional computational fluid dynamics (CFD) simulations of gas–liquid flow in a novel laboratory-scale bioreactor contained dual ventilation-pipe and double sieve-plate bioreactor (DVDSB) used for sophorolipid (SL) production. To evaluate the role of hydrodynamics in reactor design, the comparisons between conventional fed-batch fermenter and DVDSB on the hydrodynamic...

article

CFD simulations of a bubble column with and without internals by using OpenFOAM

V.H. Bhusare, M.K. Dhiman, D.V. Kalaga, S. Roy, more

Chemical Engineering Journal > 2017 > 317 > C > 157-174

Bubble column reactors are widely employed in various applications. Nowadays computational fluid dynamics (CFD) provides the state-of-the-art capabilities of simulating the hydrodynamics in these reactors. In the present work, bubble column is numerically simulated by using open source CFD tool, OpenFOAM 2.3.1. Euler-Euler two-fluid model is used for the simulations. In the first part, OpenFOAM simulations...

article

Effect of particles on bubble size distribution and gas hold-up in column flotation

Ali Vazirizadeh, Jocelyn Bouchard, Yun Chen

International Journal of Mineral Processing > 2016 > 157 > C > 163-173

In flotation systems, it is generally assumed that the bubble size presents an inverse correlation with the gas hold-up. However, this hypothesis is not systematically true. The focus of this work is to study the effect of solid particles on the bubble size distribution and gas hold-up, as well as the correlation between the bubble size distribution and gas hold-up in column flotation. Experiments...

article

A meta-analysis of empirical correlations for average gas hold-up in three-phase fluidized beds

Amir Mowla, Tanyakarn Treeratanaphitak, Hector M. Budman, Nasser Mohieddin Abukhdeir, more

Powder Technology > 2016 > 301 > C > 590-595

Experimental measurements of the average gas hold-up, a key parameter in the design and operation of three-phase (gas–liquid–solid) fluidized beds, are extracted from a multitude of published studies, classified and correlated for the first time. A simple functional, based on power-law dependence of the average gas hold-up on a number of dimensionless variables, successfully correlates gas hold-up...

article

Hydrodynamics of Newtonian and non-Newtonian liquids in internal-loop airlift reactors

Caroline E. Mendes, Alberto C. Badino

Biochemical Engineering Journal > 2016 > 109 > C > 137-152

Airlift reactors have numerous applications in processing industries, and thus the hydrodynamic behaviors using fluids that have distinct rheological characteristics need to be better understood for the successful design and operation of these devices. In this sense, the novelty of this study is to evaluate the influence of the energy losses in each reactor region on the interstitial liquid velocity...

article

Effects of surfactants on hydrodynamics and mass transfer in a co-current downflow contacting column

Ramazan Orhan, Gülbeyi Dursun

Chemical Engineering Research and Design > 2016 > 109 > C > 477-485

The effects of liquid properties on gas hold-up, bubble formation and mass transfer in a co-current downflow contacting column (CDCC) were investigated using tap water and different types surfactant solutions. The experiments were conducted using various orifice diameters (2,3 and 4mm) and at different superficial gas velocities (0.07−0.188ms⁻¹) and liquid re-circulation rates (3.3−6.67×10⁻⁵m³s⁻¹)...

article

Power consumption and gas—liquid dispersion in turbulently agitated vessels with vertical dual-array tubular coil baffles

Xun Wan, Yasuyuki Takahata, Koji Takahashi

Chemical Papers > 2016 > 70 > 4 > 445-453

In this work vertical dual-array tubular coil baffles arranged in groups of four, six or eight were investigated and the results compared with those from four planar baffles. The baffle coefficients for a single phase, along with the power consumption and gas hold-up in the gas-liquid phase of a system with the various baffle configurations for single and triple Rushton turbines are presented. Measurements...

article

Influence of different factors on momentum transfer in mechanically agitated multiphase systems

Cudak, Magdalena, Kiełbus-Rąpała, Anna, Major-Godlewska, Marta, Karcz, Joanna

Chemical and Process Engineering > 2016 > 37 > 1

article

Analiza wpływu wybranych parametrów na udział gazu zatrzymanego w cieczy dla układu biofaza-gaz-ciecz w mieszalniku z dwoma mieszadłami

M. Cudak, M. Rozdeba

Inżynieria i Aparatura Chemiczna > 2016 > Nr 2 > 50--51

Określono wpływ wybranych parametrów (natężenia przepływu gazu, częstości obrotów mieszadła, typu mieszadła oraz stężenia sacharozy w układzie) na udział gazu zatrzymanego w cieczy dla układu biofaza-gaz-ciecz w mieszalniku z dwoma mieszadłami. Badania wykonano w mieszalniku o średnicy D = 0,288 m, w którym wysokość słupa cieczy H = 2D. Wyniki opracowano w postaci równania korelacyjnego. Stwierdzono,...

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Search results

Agitation efficiency of different physical systems

Agitation efficiency of different physical systems

The effect of vessel scale on gas hold-up in gas-liquid systems

The effect of vessel scale on gas hold-up in gas-liquid systems

Hydrodynamics and mass transfer in miniaturized bubble column bioreactors

Experimental study and CFD simulation of the multiphase flow conditions encountered in a Novel Down-flow bubble column

Numerical analysis of hydrodynamics in a mechanically agitated gas–liquid pseudophase system

Udział gazu zatrzymanego w cieczy dla układu gaz-ciecz w mieszalniku z dwoma mieszadłami

Mieszanie gaz-ciecz w mieszalniku z asymetrycznym mieszadłem BT-6

Hydrodynamic study of two phase flow of column flotation using electrical resistance tomography and pressure probe techniques

Prediction of the gas hold-up in a large-diameter bubble column with liquid mixtures and electrolytes

Computational fluid dynamics simulation of a novel bioreactor for sophorolipid production

CFD simulations of a bubble column with and without internals by using OpenFOAM

Effect of particles on bubble size distribution and gas hold-up in column flotation

A meta-analysis of empirical correlations for average gas hold-up in three-phase fluidized beds

Hydrodynamics of Newtonian and non-Newtonian liquids in internal-loop airlift reactors

Effects of surfactants on hydrodynamics and mass transfer in a co-current downflow contacting column

Power consumption and gas—liquid dispersion in turbulently agitated vessels with vertical dual-array tubular coil baffles

Influence of different factors on momentum transfer in mechanically agitated multiphase systems

Analiza wpływu wybranych parametrów na udział gazu zatrzymanego w cieczy dla układu biofaza-gaz-ciecz w mieszalniku z dwoma mieszadłami

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