Multiphase Flow

Jakobsen, Hugo A.

doi:10.1007/978-3-319-05092-8_3

Cited by 20 publications

(20 citation statements)

References 200 publications

(440 reference statements)

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“…For an interesting application of the drift flux approach see van Rhee. [29] More literature on the drift flux approach can be found in: Zuber and Findlay, [42] Ishii, [13,14] Drew, [5] Manninen, [20] Jakobsen, [15] and Hiltunen. [12] In order to derive the drift flux model first some definitions are introduced.…”

Section: Drift Fluxmentioning

confidence: 99%

Concentration and velocity profiles of sediment‐water mixtures using the drift flux model

Goeree

Keetels

Munts³

et al. 2016

Can J Chem Eng

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In this paper, the concentration and velocity profiles of sediment water mixtures for open-channel flows are modelled numerically and validated with experimental results. A continuum approach, the drift flux model, is used. The mixture consists of volume fractions with different particle sizes. Hindered settling is taken into account with the closure relation of Richardson and Zaki. Transport equations are used for sediment transport. Turbulence is modelled with the LES (large eddy simulation) WALE model. The discretization of the transport and Navier-Stokes equations is done with the finite volume method. The Navier-Stokes equations are solved using a fractional step method. The numerical results are compared with experimental results concerning open-channel flows.

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Section: Drift Fluxmentioning

confidence: 99%

Concentration and velocity profiles of sediment‐water mixtures using the drift flux model

Goeree

Keetels

Munts³

et al. 2016

Can J Chem Eng

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“…For a purely diffusive flux, k G, i = D G, i /δ G where D G, i is the diffusion coefficient of the gaseous component i . However, for combined convective and diffusive contributions, k G, i is parametrized by the Reynolds and Schmidt numbers.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…Hence, both the reactor inlet and the reactor outlet were included in the computational domain, resulting in a Gauss Lobatto type of grid. Obtaining the collocation points has been studied extensively, and the reader is referred elsewhere for details. ,− In total, 30 grid points were placed in the z -direction. A summary of the numerical solution strategy is given in Table .…”

Section: Reactor Modelmentioning

confidence: 99%

Interface Mass Transfer in Reactive Bubbly Flow: A Rigorous Phase Equilibrium-Based Approach

Øyen

Jakobsen

Haug–Warberg

et al. 2021

Ind. Eng. Chem. Res.

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In this work, the driving force of interfacial mass transfer is modeled as deviation from the gas–liquid equilibrium, which by assumption is thought to exist at the interface separating the gas and liquid phases. The proposed mass transfer model provides a flexible framework where the phase equilibrium description in the driving force can be substituted without difficulties, allowing the mass transfer modeling of distillation, absorption/stripping, extraction, evaporation, and condensation to be based on a thermodynamically consistent phase equilibrium formulation. Phase equilibrium by the Soave–Redlich–Kwong equation of state (SRK-EoS) is in this work compared to the results of the classical Henry’s law approach. The new model formulation can predict mass transfer of the solvent, which Henry’s law cannot. The mass transfer models were evaluated by simulating a single-cell protein process operated in a bubble column bioreactor, and the solubilities computed from the SRK-EoS and Henry’s law were in qualitative agreement, albeit in quantitative disagreement. At the reactor inlet, the solubility of O2 and CH4 was 150% higher with the SRK-EoS than with Henry’s law. Furthermore, the SRK-EoS was computationally more expensive and spent 10% more time than Henry’s law.

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“…Thus, the heterogeneous axial dispersion model was used which considers the vital characteristics of fixed-bed reactor. According to Jakobsen (2014), the heterogeneous axial dispersion model is recommended when internal flow forms a nonideal flow . The model has two assumptions that the reactor has a uniform bed packing and that the local void fraction equals the overall holdup.…”

Section: Reactionmentioning

confidence: 99%

Design of a Novel Process for Continuous Lactide Synthesis from Lactic Acid

Park

Cho

Hwang

et al. 2018

Ind. Eng. Chem. Res.

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Lactide synthesis is an energy-intensive process used to produce polylactic acid (PLA). In this study, we propose a continuous lactide synthesis process developed on the basis of a recently developed one-step reaction using a SnO 2 −SiO 2 nanocomposite catalyst. This process enables a rapid reaction time of 40 ms for the catalyst, which achieves 94% lactide yield.To design an efficient chemical process, reaction kinetics were developed and a heterogeneous reactor model was applied to the reactor. The proposed process has advantages over commercial processes, having both a rapid reaction rate and high yield. Moreover, its rapid reaction rate significantly increases the productivity. In addition, this process operates under atmospheric pressure, which makes it more energy efficient than commercial processes that operate under a high vacuum pressure of 20 mmHg. Therefore, the overall process is an effective alternative for lactide production.

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Multiphase Flow

Cited by 20 publications

References 200 publications

Concentration and velocity profiles of sediment‐water mixtures using the drift flux model

Concentration and velocity profiles of sediment‐water mixtures using the drift flux model

Interface Mass Transfer in Reactive Bubbly Flow: A Rigorous Phase Equilibrium-Based Approach

Design of a Novel Process for Continuous Lactide Synthesis from Lactic Acid

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