A novel approach to the correlation of mass transfer rates in bubble columns with non- Newtonian liquids

Merchuk, J.C.; Ben-Zvi, Sigal

doi:10.1016/0009-2509(92)85065-j

Cited by 33 publications

(20 citation statements)

References 15 publications

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“…Various correlations [24,26] have been utilized to correlate the mass transfer coefficient (K L a 20 ) with the operation variables (N and P), the geometric parameters of the systems (V and d), and the physical properties of the fluids. Correlations of mass transfer rate with shear rate have been discussed and available in the literature, for example; Deckwer et al [27], Godbole et al [28], Merchuk and Ben-Zvi [29] and Nakanoh and Yoshida [30] for bubble column; Pérez et al [12] for stirred tank bioreactor and bubble column reactors, Campesi et al [16] for a stirred tank bioreactor. The present work develops the correlation for geometrically similar baffled surface aeration systems.…”

Section: Resultsmentioning

confidence: 99%

Mass transfer and shear rate in baffled surface aerator

Kumar

Patel

Rao

2011

Korean J. Chem. Eng.

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The scale up or scale down of the process variables in a surface aerator requires information about the shear rate prevailing in the system. In fact, the performance of surface aerator depends upon the shear rate. Shear rate affects the mass transfer operation needed by the surface aerator. Theoretical analysis of shear rate suggests a nonlinear behavior with rotational speed of the impeller, which has been shown in the present work. Present work also shows that in a geometrically similar system of baffled surface aerator, shear rate can be used as a governing parameter for scaling up or down the mass transfer phenomena.

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Section: Resultsmentioning

confidence: 99%

Mass transfer and shear rate in baffled surface aerator

Kumar

Patel

Rao

2011

Korean J. Chem. Eng.

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“…For the determination of the shear rate (γ) from hydrodynamic principles, different mathematical models have been developed [27,28], in which the rheological properties of the fluid are included or not. In our case, we have calculated the shear rate for superficial gas velocities from 0.0018 m…”

Section: Culturesmentioning

confidence: 99%

CO2 Capture of the Gas Emission, Using a Catalytic Converter and Airlift Bioreactors with the Microalga Scenedesmus dimorphus

et al. 2019

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A process composed by a catalytic converter and three sequential Airlift photobioreactors containing the microalga Scenedesmus dimorphus was studied to capture CO2, NOx, and CO from emissions of a steam boiler which was burning diesel. The catalytic converter transformed to CO2 a maximum of 78% of the CO present in the combustion gas. The effects of shear rate, light intensity, and light/dark cycles on the biomass growth of the algae were studied. It was observed that at low shear rates (Re ≈ 3200), a high productivity of 0.29 gcel L−1 d−1 was obtained. When the microalga was exposed to 60.75 µmol·m−2·s−1 of intensity of light and a light/dark cycle of 16/8 h, a maximum productivity of 0.44 gcel L−1 d−1 and a maximum CO2 fixation rate 0.8 g CO2 L−1·d−1 were obtained. The maximum CO2 removal efficiency was 64.3%, and KLa for CO2 and O2 were 1.2 h−1 and 3.71 h−1 respectively.

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“…The shear stress was calculated by the global approach postulated by Merchuk and Ben-Zvi (1992), which is based on the assumptions that the energy inlet into the system may be de®ned by isothermal expansion of the gas and that this energy is transferred through the gas±liquid interface. These assumptions facilitate the calculation of a global shear rate, in [s )1 ] as:…”

Section: Shear Stress Effectsmentioning

confidence: 99%

Simulation of algae growth in a bench‐scale bubble column reactor

Merchuk

2002

Biotech & Bioengineering

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The growth of the marine red microalga Porphyridium sp. in a bubble-column photobioreactor was simulated. The proposed model constitutes a dynamic integration of the kinetics of photosynthesis and photoinhibition with the fluid dynamics of the bubble column, including the effects of shear stress on the kinetics of growth. The kinetic data used in the model were obtained in independent experiments run in a thin-film photobioreactor with defined light/dark cycles. The maintenance term was modified to take into account the effects of liquid flow in the bioreactor on the growth rate. A hybrid method proposed for the approximate solution of the equations gave an appreciable reduction of the calculation time. Extrapolations of the model indicated the possibility of predicting the optimal diameter for an assembly of bubble column photobioreactors. Satisfactory fit was found with the experimental results of biomass growth in a 13-liter bubble column.

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A novel approach to the correlation of mass transfer rates in bubble columns with non- Newtonian liquids

Cited by 33 publications

References 15 publications

Mass transfer and shear rate in baffled surface aerator

Mass transfer and shear rate in baffled surface aerator

CO2 Capture of the Gas Emission, Using a Catalytic Converter and Airlift Bioreactors with the Microalga Scenedesmus dimorphus

Simulation of algae growth in a bench‐scale bubble column reactor

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