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

Cudak, Magdalena; Kiełbus-Rąpała, Anna; Major-Godlewska, Marta; Karcz, J.

doi:10.1515/cpe-2016-0005

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…RT experiments consume more energy with the exception of no baffle experiment, where PBT has a higher value of power consumption compared to the RT experiment something that is confirmed from the literature. 40 , 41 It should be mentioned that PBTU is the same with PBT because all mixed flow experiments occur in upward trending.…”

Section: Resultsmentioning

confidence: 99%

Kinetic Analysis of Methane–Propane Hydrate Formation by the Use of Different Impellers

Longinos

Parlaktuna

2021

ACS Omega

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In the present study, the effect of different kinds of impellers with different baffles or no baffle was investigated. Up-pumping pitched blade turbine (PBTU) and Rushton turbine (RT) were the two types of impellers tested. The reactor was equipped with different designs of baffles: full, half and surface baffles, or no baffles. Single (PBTU or RT) and dual (PBTU/PBTU or RT/RT) use of impellers with full (FB), half (HB), surface (SB), and no baffle (NB) combinations formed two sets of 16 experiments. The first group of experiments was close to the equilibrium line (P = 26.5 bars and T = 8.5 °C), and the second group was deep in the equilibrium line (P = 24.5 bars and T = 2 °C). There was estimation of rate of hydrate formation, induction time, hydrate productivity, overall power consumption, split fraction, and separation factor. In both single and dual impellers, the results showed that RT experiments are better compared to PBTU in the rate of hydrate formation. The induction time is almost the same because we are deep in the equilibrium line while, hydrate productivity values are higher in PBTU compared to RT experiments. As a general view, RT experiments consume more energy compared to PBTU experiments.

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Section: Resultsmentioning

confidence: 99%

Kinetic Analysis of Methane–Propane Hydrate Formation by the Use of Different Impellers

Longinos

Parlaktuna

2021

ACS Omega

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“…The Rushton turbine was not recommended to biological processes with microorganisms and processes which are very sensitive to the shear stress. At another research work by Cudak et al [79] a comparative analysis based on experimental data concerning the impact of the impeller geometry and baffles geometry, number and shape of impellers, the scale of the agitated tank, as well as their off-bottom clearance and properties of the multiphase systems on the critical impeller speeds, were investigated. The authors conclude that in order to generate dispersion or suspension, energy consumption and gas hold-up have to be considered in parallel in order to enable appropriate conditions to drawdown or suspended particles, as well as to disperse small and large air bubbles in liquids.…”

Section: Gas-liquid and Gas-liquid-liquid Systemmentioning

confidence: 99%

“…The simulation results showed that flow pattern and dimensionless velocity distribution are related to Reynolds number and regime type without change values in the turbulent regime. The lowest drop of total power number for single and parallel configuration of the impellers was observed in laminar regime [5,6,78,79,164]. A large number of researchers have performed numerical simulations to examine the impact of impeller geometry on the mixing process in order to find optimal configuration, low mixing time or low power consumption [165][166][167].…”

Section: The Effect Of Impellersmentioning

confidence: 99%

A General Review of the Current Development of Mechanically Agitated Vessels

Jaszczur

Młynarczykowska

2020

Processes

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The mixing process in a mechanically agitated vessel is a widespread phenomenon which plays an important role among industrial processes. In that process, one of the crucial parameters, the mixing efficiency, depends on a large number of geometrical factors, as well as process parameters and complex interactions between the phases which are still not well understood. In the last decade, large progress has been made in optimisation, construction and numerical and experimental analysis of mechanically agitated vessels. In this review, the current state in this field has been presented. It shows that advanced computational fluid dynamic techniques for multiphase flow analysis with reactions and modern experimental techniques can be used with success to analyse in detail mixing features in liquid-liquid, gas-liquid, solid-liquid and in more than two-phase flows. The objective is to show the most important research recently carried out.

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“…Many empirical correlations were presented for power consumption (Nagata, 1975;Stręk, 1981), heat transfer (Kuncewicz, 2012;Stręk, 1981) and mass transfer (Harnby et al, 1997), as well as for multiphase systems (Kamieński, 2004;Tatterson, 1991). Recently, experimental studies have been developed on momentum transfer (Cudak et al, 2016), power consumption (Major-Godlewska and Karcz, 2018), heat transfer (Petera et al, 2017;Rosa et al, 2020), multi-phase system production (Cudak, 2016, Cudak et al, 2019Kiełbus-Rąpała et al, 2019), gas hold-up (Busciglio et al, 2017;Cudak, 2020;Lee and Dudukovic, 2014) and mass transfer (Kracik et al, 2020;Petricek et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Chemical and Process Engineering

Karcz,

Szoplik,

Major-Godlewska

et al. 2021

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In memory of Professor Jerzy BałdygaEfficiency 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 m 3 to 0.2 m 3 . 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.

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

Cited by 7 publications

References 21 publications

Kinetic Analysis of Methane–Propane Hydrate Formation by the Use of Different Impellers

Kinetic Analysis of Methane–Propane Hydrate Formation by the Use of Different Impellers

A General Review of the Current Development of Mechanically Agitated Vessels

Chemical and Process Engineering

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