CFD study of mixing characteristics of bubble column and external loop airlift reactor

Roy, Swarnendu; Joshi, Jyeshtharaj B.

doi:10.1002/apj.122

Cited by 18 publications

(13 citation statements)

References 26 publications

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“…Such an upwarddownward flow does not give good solid suspension and we need an upward flow at all the locations in the riser; in other words we desire a homogeneous regime instead of a heterogeneous regime [22,23]. For such a requirement, the CFD simulation has been reported by Roy and Joshi [24]. The procedure is an extension of the CFD formulation represented by Equations (21)-(33).…”

Section: Resultsmentioning

confidence: 99%

Process Intensification: A Case Study

Lohokare¹,

Bhusare

Joshi

2015

Indian Chemical Engineer

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While implementing a new chemical process, an attempt is made to design all the equipment by using best available knowledge together with pilot plant experiments. However, the status of current knowledge is closer to an "art" than the desired state of "science". Therefore, as the new knowledge gets developed with respect to time, the designs of equipment in operating plants can be improved with incremental cost for modifications. Improvements are possible in capacity, selectivity, purity and safety of the plant. The process of incorporating such improvements is called "Process Intensification". In the present work, a real case study has been described which has given substantial benefits in capacity and selectivity. It has been brought out that the key features of process intensification are: (i) to understand quantitatively all the rate processes such as mass transfer, heat transfer, chemical kinetics, etc. and (ii) to understand the fluid mechanics and relate fluid mechanical parameters to the rate processes and hence the design objectives.

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Section: Resultsmentioning

confidence: 99%

Process Intensification: A Case Study

Lohokare¹,

Bhusare

Joshi

2015

Indian Chemical Engineer

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“…For an external loop airlift reactor (EL-ALR), the CFD provides a framework to optimize mixing, heat transfer coefficient, interfacial area, solid suspension, and mass transfer coefficient, depending upon the rate-controlling step [see Joshi et al (134), Lele & Joshi (135,136), and Roy et al (137)]. The optimum geometrical and operating parameters of EL-ALR are widely different for each of the above design objectives, and significant benefits can be accrued by CFD simulations in terms of either capital or operating (pressure drop) costs or both.…”

Section: Figurementioning

confidence: 99%

Computational Modeling of Multiphase Reactors

Joshi

Nandakumar²

2015

Annu. Rev. Chem. Biomol. Eng.

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Multiphase reactors are very common in chemical industry, and numerous review articles exist that are focused on types of reactors, such as bubble columns, trickle beds, fluid catalytic beds, etc. Currently, there is a high degree of empiricism in the design process of such reactors owing to the complexity of coupled flow and reaction mechanisms. Hence, we focus on synthesizing recent advances in computational and experimental techniques that will enable future designs of such reactors in a more rational manner by exploring a large design space with high-fidelity models (computational fluid dynamics and computational chemistry models) that are validated with high-fidelity measurements (tomography and other detailed spatial measurements) to provide a high degree of rigor. Understanding the spatial distributions of dispersed phases and their interaction during scale up are key challenges that were traditionally addressed through pilot scale experiments, but now can be addressed through advanced modeling.

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“…Countercurrent liquid flow is rarely used in industry as it provides minor, if any, advantages and multiple complications [32], with separation by evaporation being one of the few exceptions [33]. Bubble columns tend to be ta ll ratio (H/DR) because the he ight i a process and residence time, especially ~ r at hand operations [34]. Biochemi ca l proce e requir an between 2 to 5, even for experim ntal " rk.…”

Section: Microorgamsmsmentioning

confidence: 99%

Hydrodynamic Considerations in Bioreactor Selection and Design

Kadic

Heindel

2010

ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C

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The biological production of renewable fuels and chemicals, medicines, and proteins is not possible without a properly functioning bioreactor. Bioreactors are expected to meet several basic requirements and create conditions favorable to the biological material such that the desired production is maximized. The basic requirements, which are strongly influenced by fluid mechanic principles, may include minimum damage to the biological material, maximum reactor volume utilization, optimized gas-liquid mass transfer, and/or enhanced mass transfer from the liquid to the biological species. Each of these goals may be achieved within any of the major bioreactor designs, which generally fall under the categories of stirred tank, bubble column, or airlift bioreactor. Yet, each of the bioreactor designs has strengths and weaknesses. This paper provides an overview of bioreactor hydrodynamic developments and the fluid mechanic issues that should to be considered when selecting a bioreactor for experimental and production purposes.

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CFD study of mixing characteristics of bubble column and external loop airlift reactor

Cited by 18 publications

References 26 publications

Process Intensification: A Case Study

Process Intensification: A Case Study

Computational Modeling of Multiphase Reactors

Hydrodynamic Considerations in Bioreactor Selection and Design

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