Numerical simulation of the gas-liquid flow inside a horizontal static mixer

The gas-liquid flow inside a horizontal static mixer was numerically investigated by using Euler-Euler Computational Fluid Dynamics (CFD) simulations. The results confirm that the liquid superficial velocity plays a significant role on the mixing behavior of the gas and liquid. The mixing behavior in this present study at a liquid superficial velocity of 0.2 m/s was the worst both axially and radially. Increasing the liquid superficial velocity significantly improve the mixing between gas and liquid. However, the unwanted gas layer still can be found at the superficial liquid velocity less than 0.8 m/s. A good mixing behavior in this study was achieved at a relatively high velocity (i.e. larger than 0.8 m/s).

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Gas-Liquid Flow in a Vertical Pipe Equipped with a Double Helical Swirl Separator Element

Jurnal Inotera ◽

10.31572/inotera.vol5.iss2.2020.id110 ◽

2020 ◽

Vol 5 (2) ◽

pp. 92-99

Author(s):

Ryan Anugrah Putra ◽

Akhlisa Nadiantya Aji Nugroho ◽

Aditya Ramadhona ◽

Erick Wisnu Kuncoro Baroto

Keyword(s):

Fluid Dynamics ◽

Liquid Flow ◽

Flow Behavior ◽

Superficial Velocity ◽

Separation Condition ◽

Vertical Pipe ◽

Computational Fluid Dynamics Cfd ◽

Gas Liquid Flow ◽

Liquid Flows ◽

Separation Behavior

Two different gas-liquid flow behavior downstream a double helical swirl element inside a vertical pipe was observed in our preliminary experiment. The present Computational Fluid Dynamics (CFD) study confirms that the dynamics of gas-liquid flows inside the swirl separator is highly influenced by the liquid superficial velocity. The separation behavior in this work at a liquid superficial velocity of 0.1 m/s was the worst both axially and radially since the gas core cannot be sustained up to the outlet. The separation condition was improved by the increase of the liquid superficial velocity. The best separation condition in this study was achieved at the liquid superficial velocity of 1.0 m/s where the dense gas core can be maintained up to the outlet.

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Liquid phase residence time distribution for gas–liquid flow in Kenics static mixer

Chemical Engineering and Processing - Process Intensification ◽

10.1016/j.cep.2007.12.015 ◽

2008 ◽

Vol 47 (12) ◽

pp. 2275-2280 ◽

Cited By ~ 14

Author(s):

Tirupati Reddy Keshav ◽

P. Somaraju ◽

K. Kalyan ◽

A.K. Saroha ◽

K.D.P. Nigam

Keyword(s):

Liquid Phase ◽

Residence Time ◽

Liquid Flow ◽

Time Distribution ◽

Residence Time Distribution ◽

Static Mixer ◽

Gas Liquid Flow

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Mixing Characteristics Of Gas-Liquid Flow In A Static Mixer: A Numerical Study

Angkasa: Jurnal Ilmiah Bidang Teknologi ◽

10.28989/angkasa.v12i2.654 ◽

2020 ◽

Vol 12 (2) ◽

Author(s):

Ryan Anugrah Putra

Keyword(s):

Liquid Velocity ◽

Numerical Study ◽

Axial Distance ◽

Sudden Increase ◽

Static Mixer ◽

Mixing Condition ◽

Mixing Characteristics ◽

Euler Model ◽

Gas Liquid Flow ◽

Liquid Flows

Mixing characteristics of gas-liquid co-current upward flow inside a vertical pipe equipped with a helical static mixer element were numerically investigated. The results from computational fluid dynamics (CFD) simulations with Euler-Euler model of three different length to diameter ratio (L/D) of the static mixer elements were compared. All simulated static mixers provide a better mixing condition in the comparison with the one without a static element. The sudden increase of rotational strength indicated by the liquid velocity curl was observed once the gas-liquid flows enter the static-mixer element zone. The smallest L/D static mixer provides the highest liquid velocity curl in the smallest axial distance providing the most effective mixing process among the tested elements. The best mixing characteristics shown by radial gas distribution was achieved with the static mixer with a smallest L/D.

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Influence of trickling liquid velocity, low molar ratio of nitrogen/sulfur and gas-liquid flow pattern in anoxic biotrickling filters for biogas desulfurization

Biochemical Engineering Journal ◽

10.1016/j.bej.2019.05.008 ◽

2019 ◽

Vol 148 ◽

pp. 205-213 ◽

Cited By ~ 8

Author(s):

Patricio I. Cano ◽

Javier Brito ◽

Fernando Almenglo ◽

Martín Ramírez ◽

Jose M. Gómez ◽

...

Keyword(s):

Flow Pattern ◽

Liquid Flow ◽

Liquid Velocity ◽

Molar Ratio ◽

Biotrickling Filters ◽

Gas Liquid Flow

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Non-Invasive Method for Velocity and Slug Length Measurements in Gas/Liquid Flow in Horizontal Pipes

Fluids Engineering ◽

10.1115/imece2005-82885 ◽

2005 ◽

Cited By ~ 1

Author(s):

S. Al-Lababidi ◽

M. L. Sanderson

Keyword(s):

Liquid Flow ◽

Liquid Velocity ◽

Correlation Technique ◽

Translational Velocity ◽

Two Phase ◽

Horizontal Pipe ◽

Horizontal Pipes ◽

Non Invasive ◽

Gas Liquid Flow ◽

Superficial Gas Velocity

A method was developed for the measurement of slug frequency, slug velocity and slug length of two-phase gas/liquid flow under slug conditions in 2-inch horizontal pipe. The method consists of two pairs of ultrasonic transducers with 1MHz frequency. Non-invasive detection for slugs was achieved over a range of (0.1–1 ms−1) superficial liquid velocity and (0.1–3 ms−1) superficial gas velocity. The slug translational velocity was measured using a cross correlation technique for the modulated ultrasonic signals received. The slug length was measured after measuring the slug time t(slug) and slug translational velocity. The slug parameters measured were extensively compared with conductivity probes measurements and experimental correlations.

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The flow and mass transfer characteristics of concentric gas-liquid flow in an advanced static mixer

Chemical Industry and Chemical Engineering Quarterly ◽

10.2298/ciceq191213024m ◽

2020 ◽

pp. 24-24

Author(s):

Huibo Meng ◽

Zhonggen Li ◽

Yanfang Yu ◽

Mengqi Han ◽

Shuning Song ◽

...

Keyword(s):

Mass Transfer ◽

Liquid Flow ◽

Operating Conditions ◽

Static Mixer ◽

Transfer Coefficients ◽

Mass Transfer Coefficients ◽

Local Mass ◽

Transfer Characteristics ◽

Local Mass Transfer ◽

Gas Liquid Flow

The fluid dynamic and mass transfer characteristics of concentric upward gas-liquid flow were studied in the industrial static mixer with four equally spaced helical inserts (FKSM). The numerical simulations of gas volume fraction in Kenics mixer had a good agreement with the numerical and experimental results provided by Rabha et al. The characteristics of radial gas void fraction and local mass transfer coefficients in the FKSM were evaluated under different operating conditions. The velocity profiles of concentric air phase accelerated by the bubble forces firstly became sharp and narrow until z/l=-3.27 and then slowly decreased and stabilized at z/l=-1.5 before entering the first mixing element. Some extra unimodal profile of radial gas holdup gradually generated near the rectangle cross sections of mixing elements. The ?G gradually enlarged from r/R=0.2 to r/R=0.55 and then weakened from r/R=0.65 to r/R=0.874. The air void fractions in the bulk flow region decreased with the increasing initial uniform bubble diameter. The inlet effect of first leading edge enhanced the air phase dispersion and local mass transfer coefficients sharply increased from 2.04 to 3.69 times of that in the inlet. The local mass transfer coefficients in each mixing group had unimodal profiles.

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