Hydrodynamics and mass transfer in a modified three-phase airlift loop reactor

Liu, Mengxi; Lu, Chunxi; Ming-xian, Shi; Ge, Baoli; Huang, Jie

doi:10.1007/s12182-007-0015-8

Cited by 11 publications

(2 citation statements)

References 8 publications

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“…Literature suggest that there are large gradients of velocity and concentration distribution in the radial direction in the large-diameter BCRs, which is harmful to the uniformity of the reaction. [4,5,[6][7]8,9] Meanwhile, there is a liquid reflux layer in the near-wall region, which would extend the residence time of reactants. Since the co-hydrogenation process is a high-viscosity system, the non-uniformity of distribution and liquid reflux are strengthened.…”

Section: Introductionmentioning

confidence: 99%

Effect of resistance internal on hydrodynamic behaviours and bubble characteristics in a laboratory‐scale bubble column

Qian

Huang

et al. 2022

Can J Chem Eng

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A novel resistance internal is proposed to optimize the flow field and improve the gas–liquid contact in a co‐hydrogenation reactor of coal and vacuum residuum. Local gas holdup, local liquid velocity, and characteristics of the bubble were investigated in a scaled‐down laboratory model. The quantitative results showed that the resistance internals could reduce the thickness of the liquid reflux layer by a percentage up to 32% and reduce the difference in the local gas holdup at cross‐sections of up to 44%. The Sauter mean diameter of the bubble decreased from 20.30 to 16.00 mm, which aroused the increase in bubble surface area by a percentage of up to 71.9%. The resistance internal promoted the breakup of the bubble with multiple mechanisms and provided diversion to fluid. In this work, improvement at multiple scales was realized, and the technical support for industrial application was provided.

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Section: Introductionmentioning

confidence: 99%

Effect of resistance internal on hydrodynamic behaviours and bubble characteristics in a laboratory‐scale bubble column

Qian

Huang

et al. 2022

Can J Chem Eng

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“…Compared to theoretical studies of multiphase hydrodynamics (Liu et al 2007 ; Wang and Sun 2009 ), and multiphase heat transfer in pipe flow (Zheng et al 2016 ; Gao et al 2016 ; Karimi and Boostani 2016 ; Rushd and Sanders 2017 ), there are very limited research results in the open literature for multiphase heat transfer in wellbore annuli. Davis et al ( 1979 ) obtained a model for calculating the local Nusselt numbers of stratified gas/liquid flow in turbulent liquid/turbulent gas conditions.…”

Section: Introductionmentioning

confidence: 99%

A mechanistic model of heat transfer for gas–liquid flow in vertical wellbore annuli

Yin

Liu

2017

Pet. Sci.

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The most prominent aspect of multiphase flow is the variation in the physical distribution of the phases in the flow conduit known as the flow pattern. Several different flow patterns can exist under different flow conditions which have significant effects on liquid holdup, pressure gradient and heat transfer. Gas–liquid two-phase flow in an annulus can be found in a variety of practical situations. In high rate oil and gas production, it may be beneficial to flow fluids vertically through the annulus configuration between well tubing and casing. The flow patterns in annuli are different from pipe flow. There are both casing and tubing liquid films in slug flow and annular flow in the annulus. Multiphase heat transfer depends on the hydrodynamic behavior of the flow. There are very limited research results that can be found in the open literature for multiphase heat transfer in wellbore annuli. A mechanistic model of multiphase heat transfer is developed for different flow patterns of upward gas–liquid flow in vertical annuli. The required local flow parameters are predicted by use of the hydraulic model of steady-state multiphase flow in wellbore annuli recently developed by Yin et al. The modified heat-transfer model for single gas or liquid flow is verified by comparison with Manabe’s experimental results. For different flow patterns, it is compared with modified unified Zhang et al. model based on representative diameters.

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Structure optimization of gas-liquid combined loop reactor using a CFD-PBE coupled model

Zhang

et al. 2012

Pet. Sci.

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Flow characteristics, such as flow pattern, gas holdup, and bubble size distribution, in an model. Numerical results reveal that introducing a downcomer tube and a draft tube can help to improve the mass and heat transfer of the reactor through enhanced liquid circulation, increased gas holdup and reduced bubble diameter. The hydrodynamic behavior in the internal loop reactor with external liquid circulation can be managed effectively by adjusting the diameter and axial position of the draft tube.

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Hydrodynamics and mass transfer in a modified three-phase airlift loop reactor

Cited by 11 publications

References 8 publications

Effect of resistance internal on hydrodynamic behaviours and bubble characteristics in a laboratory‐scale bubble column

Effect of resistance internal on hydrodynamic behaviours and bubble characteristics in a laboratory‐scale bubble column

A mechanistic model of heat transfer for gas–liquid flow in vertical wellbore annuli

Structure optimization of gas-liquid combined loop reactor using a CFD-PBE coupled model

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