Gas‐Liquid Mixing in a Grid‐Disc Impeller Stirred Tank

Yang, Fengli; Sun, Haiyao; Zhang, Cuixun

doi:10.1002/ceat.201900651

Cited by 11 publications

(4 citation statements)

References 44 publications

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“…The bubbly flow regime transition characteristics can be defined in accordance with the flow number ( F l ) and the Froude Number ( F r ). The flow number is the ratio of the gas flow rate to the impeller drive flow rate, as shown in Equation (); the Froude number is the ratio of the impeller drive acceleration to the gravity, as shown in Equation () 38

italicFl = \frac{Q_{normalg}}{{italicND}^{3}}

italicFr = \frac{N^{2} D}{g}

where Q g is the reactor inlet flow rate, N is the stirring speed, D is the radial flow impeller diameter, and g is the acceleration of gravity.…”

Section: Resultsmentioning

confidence: 99%

Circulating jet for enhancing the mass transfer in a gas–liquid stirred tank reactor

Wang

et al. 2021

AIChE Journal

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There are some problems in gas–liquid stirred tank reactor (STR), such as low mass transfer efficiency, high exhaust gas oxygen concentration, and low product conversion rate, due to limitations of stirring speed and input power. This article summarizes the effect of adding circulating jet internals on bubble size distribution, overall gas holdup, gas–liquid volumetric mass transfer coefficient, and power per unit volume of the STR. When circulating jet is added, the average bubble Sauter mean diameter in the STR is reduced to 1.26 mm, and the overall gas holdup is increased to 8.23%, which is an increase of 3.62 times of the original STR. The gas–liquid volumetric mass transfer coefficient is increased to 0.05556 s−1, which is 4.84 times of the original STR. The power per unit volume is increased by only 1.4 times. These data provide references for the design and scale‐up of new jet STRs.

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italicFl = \frac{Q_{normalg}}{{italicND}^{3}}

italicFr = \frac{N^{2} D}{g}

where Q g is the reactor inlet flow rate, N is the stirring speed, D is the radial flow impeller diameter, and g is the acceleration of gravity.…”

Section: Resultsmentioning

confidence: 99%

Circulating jet for enhancing the mass transfer in a gas–liquid stirred tank reactor

Wang

et al. 2021

AIChE Journal

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“…1a. In order to compare the study results, a synchronous analysis on a standard Rushton impeller was carried out, with the standard Rushton impeller [11,12] being shown in Fig. 1b.…”

Section: Physical Modelmentioning

confidence: 99%

Hydrodynamic Characteristics of a Stirred Tank with Self‐Priming Jet Impeller

Zhang

Yuan

et al. 2023

Chem Eng & Technol

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Multiple inclined hollow pipes were combined to form a self‐priming jet (SPJ) impeller. The hydrodynamic and mixing characteristics in the tank were studied by numerical simulation. The feasibility of the numerical simulation model was verified by particle distribution experiments. The results showed that the turbulence intensity and vorticity were affected by the installation height and diameter of the impeller; the mixing performance was improved with increasing diameter and installation angle. The study on the enhanced mixing mechanism showed that the self‐priming was generated in the lower part of the impeller, the flow was accelerated in the empty pipe, and the jet was generated in the upper part of the impeller. Self‐priming and jet caused multiple axial internal circulation flows in the SPJ tank.

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“…It also uses the friction and centrifugal actions of the rotating disc to drive the media [102][103][104][105]. The impeller structure of the two is obviously different, but the research results of the flow mechanism and flow characteristics also provide a reference for the design and development of the disc pump [106][107][108][109][110]. Therefore, typical cases and results are also reviewed in this study.…”

Section: Physical Model With Extended Applicationmentioning

confidence: 99%

Research on Energy-Efficient Disc Pumps: A Review on Physical Models and Energy Efficiency

Pei,

Liu,

Ooi

2023

Machines

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Disc pumps have obvious advantages in dealing with difficult-to-pump media. Energy efficiency and sustainable energy management are important topics with regard to reducing costs and promoting carbon neutrality. Though the concept of the disc pump was proposed in the 1850s, development was slow and limited by its initial model. However, with the development of industries such as petrochemicals and food, the efficient pumping of difficult-to-pump media is much needed, but facing challenges. Therefore, research on energy-efficient disc pumps is particularly important moving forward. In this paper, the available information from the open literature about the research and development of the disc pump will be thoroughly reviewed. It focuses on the historical development, energy efficiency and physical model application of the disc pump. The review ends with a proposal for the direction of future development, and in this aspect, it is proposed that the energy efficiency prediction model based on velocity slip theory, the energy management system based on multi-scenarios and the design method based on energy conversion theory are important. The latest achievements in energy conversion are given. This review also provides a new perspective for the development of energy-efficient disc pumps.

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Gas‐Liquid Mixing in a Grid‐Disc Impeller Stirred Tank

Cited by 11 publications

References 44 publications

Circulating jet for enhancing the mass transfer in a gas–liquid stirred tank reactor

Circulating jet for enhancing the mass transfer in a gas–liquid stirred tank reactor

Hydrodynamic Characteristics of a Stirred Tank with Self‐Priming Jet Impeller

Research on Energy-Efficient Disc Pumps: A Review on Physical Models and Energy Efficiency

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