Search results for: Magdalena Cudak

Items from 1 to 14 out of 14 results

article

Hydrodynamics of two- and three-phase systems in an agitated vessel with two agitators

Magdalena Cudak

Polish Journal of Chemical Technology > 2024 > Vol. 26, nr 2 > 18--24

The effect of the agitators confi guration, the agitator speed, the volumetric gas flow rate, the sucrose concentration in aqueous solution, and the yeast suspension concentration on the hydrodynamics of twoor three-phase systems in an agitated vessel with two agitators has been presented in this paper. The gas hold-up and the average residence time of the bubbles were measured in agitated vessel...

article

Sparse data classifier based on first-past-the-post voting system

Magdalena Cudak, Mateusz Piech, Robert Marcjan

Computer Science > 2022 > T. 23 (2) > 277--296

A point of interest (POI) is a general term for objects that describe places from the real world. The concept of POI matching (i.e., determining whether two sets of attributes represent the same location) is not a trivial challenge due to the large variety of data sources. The representations of POIs may vary depending on the basis of how they are stored. A manual comparison of objects is not achievable...

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

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

Experimental analysis of the chosen parameters effects on a gas hold up for mechanically agitated two- or three-phase systems

Magdalena Cudak, Joanna Cieślik

Czasopismo Techniczne > -

In the paper, the analysis of the chosen parameters effects (gas flow rate, the impeller speed, type of impeller and concentration of the aqueous solutions of sucrose) on the gas hold-up for gas-liquid and gas-liquid--biophase systems mechanically agitated are presented. Experimental studies were conducted in a vessel of the diameter of 0.288 m. The agitated vessel was equipped with Rushton or A 315...

article

Hydrodynamic Characteristics of Mechanically Agitated Air - Aqueous Sucrose Solutions

Magdalena Cudak

Chemical and Process Engineering > 2014 > 35 > 1 > 97-107

The aim of the research presented in this paper was determination of power consumption and gas hold-up in mechanically agitated aerated aqueous low concentration sucrose solutions. Experimental studies were conducted in a vessel of diameter 0.634 m equipped with high-speed impellers (Rushton turbine, Smith turbine or A 315). The following operating parameters were changed: volumetric gas flow rate...

article

The effects of eccentricity of axial flow impeller on the momentum transfer process in an agitated vessel

Magdalena Cudak, Joanna Karcz

Experimental Thermal and Fluid Science > 2013 > 44 > Complete > 385-391

In the paper, the results of the experimental studies concerning the effects of an eccentricity of axial flow impeller (propeller or HE 3) on the momentum transfer process in an agitated vessel have been analyzed. Experiments were carried out in the un-baffled vessel of inner diameter T=0.3m, using computer-aided electrochemical method. Distributions of the transport coefficients in the region of...

article

Local Momentum Transfer Process in a Wall Region of an Agitated Vessel Equipped with an Eccentric Impeller

Magdalena Cudak, Joanna Karcz

Industrial & Engineering Chemistry Research > 2011 > 50 > 7 > 4140 - 4149

article

The effect of the physical properties of the liquid phase on the gas-liquid mass transfer coefficient in two- and three-phase agitated systems

Anna Kiełbus-Rąpała, Joanna Karcz, Magdalena Cudak

Chemical Papers > 2011 > 65 > 2 > 185-192

The results of studies concerning two- and three-phase systems in an agitated vessel are presented. The aim of our research was to investigate the effect of the physical properties of the liquid phase on the value of the volumetric gas-liquid mass transfer coefficient in mechanically agitated gas-liquid and gas-solid-liquid systems. Our experimental studies were conducted in a vessel with an internal...

article

Transport phenomena in an agitated vessel with an eccentrically located impeller

Magdalena Cudak, Joanna Karcz, Anna Kiełbus-Rąpała

Chemical Papers > 2011 > 65 > 2 > 147-155

The paper presents results of an experimental analysis of the transport phenomena at the vicinity of the wall of an unbaffled agitated vessel with an eccentrically located impeller. Distributions of the transport coefficients were experimentally studied using an electrochemical method within the turbulent regime of the Newtonian liquid flow. Measurements were carried out in an agitated vessel with...

article

Distribution of local heat transfer coefficient values in the wall region of an agitated vessel

Magdalena Cudak, Joanna Karcz

Chemical Papers > 2008 > 62 > 1 > 92-99

Experimentally found local heat transfer coefficients are analyzed as a function of the measuring point on the heat transfer surface area of the agitated vessel wall and of the impeller eccentricity. Eccentric Rushton turbine and A 315 impeller are considered. Local heat transfer coefficients were measured by means of the computer-aided electrochemical method. The measurements were performed in an...

article

Distribution of local heat transfer coefficient values in the wall region of an agitated vessel

Magdalena Cudak, Joanna Karcz

Chemical Papers > 2008 > 62 > 6 > 92-99

article

Stirring of a liquid in a stirred tank with an eccentrically located impeller

Joanna Karcz, Magdalena Cudak, Jolanta Szoplik

Chemical Engineering Science > 2005 > 60 > 8-9 > 2369-2380

The results of an experimental analysis of the stirring of a liquid in a tank equipped with an eccentrically located propeller or HE 3 impeller are presented in the paper. Mixing time, power consumption and the distributions of the momentum and heat transfer coefficients on the tank wall as a function of the impeller eccentricity e/R were studied within the turbulent regime of the Newtonian liquid...

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