Experimental investigation and CFD simulation of turbulence effect on hydrodynamic and mass transfer in a packed bed airlift internal loop reactor

Moraveji, Mostafa Keshavarz; Sajjadi, Baharak; Jafarkhani, Mahboubeh; Davarnejad, Reza

doi:10.1016/j.icheatmasstransfer.2010.12.033

“…As is known, packing normally increases the mass transfer and gas hold-up. Therefore, packing was applied in this work to compare the unpacked results (Moraveji et al, 2011a) with the packed ones.…”

Section: Apparatus Set Up and Measurement Methodsmentioning

confidence: 99%

“…However, several techniques were applied to enhance the oxygen transfer rates in columns at low aeration rates (Fraser and Hill, 1993;Godo et al 1999;Su and Heindel, 2004), but the oxygen transfer coefficient was significantly increased by adding packing into the column (Moraveji et al, 2011a). Nikakhtari and Hill (2005) used stainless steel meshes as a packing with 99.0% porosity in the riser section of an external loop airlift bioreactor (ELAB).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and oxygen mass transfer characteristics of petroleum based micro-emulsions in a packed bed split-cylinder airlift reactor

Moraveji

¹

,

Mohsenzadeh

²

,

Fakhari

³

et al. 2013

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-The effects of aeration velocity and liquid properties on the pertinent hydrodynamic and mass transfer parameters in a split-cylinder airlift reactor (with and without packing) were examined. Four different oil-in-water micro-emulsion systems containing kerosene, heavy naphtha, light naphtha and diesel as the oil at the concentration of 7% (v/v) were used in the experiments and the results were compared with pure water. The experimental results showed that the gas (air) hold-up and the volumetric gas-liquid oxygen transfer coefficient values for the micro-emulsion systems were usually greater than those of pure water. The packing installation increased the overall gas-liquid volumetric mass transfer coefficient by increasing the flow turbulence and Reynolds number, compared to the unpacked column. The packing increased the gas hold-up and decreased the bubble size and liquid circulation velocity. Furthermore, two empirical correlations were developed to predict the overall gas hold-up and volumetric oxygen transfer coefficient. A good agreement was observed between the experimental and correlated data.

show abstract

“…34 The lift force, drag and turbulent stresses model supplied in the current work are described in the Moraveji et al literature. 35 …”

Section: Momentum Transfer Equationmentioning

confidence: 99%

CFD Simulation of Liquid Dispersion in Bubble Column

Bagheripour¹

2017

IPCSE

View full text Add to dashboard Cite

In the current work, a modeling simulation based on the Computational Fluids Dynamic (CFD) method was done for two phase flow (gas-liquid) in two bubble columns. The effect of geometrical (two column diameters) and different gas velocity on the system hydrodynamics (gas hold up, mixing time) was investigated. Furthermore, the liquid circulation velocity in the columns was predicted. The simulated results were agreement with the experimental data reported in the literature. It was concluded that gas hold up was decreased while bubble column diameter increased from 15cm to 30cm in both experimental and CFD data's. But gas hold up was increased by increasing superficial gas velocity. In addition, it was seen that increasing of bubble column diameter from 15 to 30 cm leads to decreasing of mixing time. also mixing time reduced when superficial gas velocity was increased from 1 to 10cm/s. Moreover, for more study on CFD simulation of bubble columns with different diameters, the effect of different superficial gas velocity on the liquid circulation velocity was predicted for two reactors. This prediction has shown increasing of liquid circulation velocity versus of increasing superficial gas velocity but it reduced when reactor diameter was increased.

show abstract

“…34 The lift force, drag and turbulent stresses model supplied in the current work are described in the Moraveji et al literature.…”

Section: Momentum Transfer Equationmentioning

confidence: 99%

CFD Simulation of Liquid Dispersion in Bubble Column

Bagheripour¹

2017

IPCSE

View full text Add to dashboard Cite

In the current work, a modeling simulation based on the Computational Fluids Dynamic (CFD) method was done for two phase flow (gas-liquid) in two bubble columns. The effect of geometrical (two column diameters) and different gas velocity on the system hydrodynamics (gas hold up, mixing time) was investigated. Furthermore, the liquid circulation velocity in the columns was predicted. The simulated results were agreement with the experimental data reported in the literature. It was concluded that gas hold up was decreased while bubble column diameter increased from 15cm to 30cm in both experimental and CFD data's. But gas hold up was increased by increasing superficial gas velocity. In addition, it was seen that increasing of bubble column diameter from 15 to 30 cm leads to decreasing of mixing time. also mixing time reduced when superficial gas velocity was increased from 1 to 10cm/s. Moreover, for more study on CFD simulation of bubble columns with different diameters, the effect of different superficial gas velocity on the liquid circulation velocity was predicted for two reactors. This prediction has shown increasing of liquid circulation velocity versus of increasing superficial gas velocity but it reduced when reactor diameter was increased.

show abstract

Experimental investigation and CFD simulation of turbulence effect on hydrodynamic and mass transfer in a packed bed airlift internal loop reactor

Cited by 20 publications

References 22 publications

Hydrodynamics and oxygen mass transfer characteristics of petroleum based micro-emulsions in a packed bed split-cylinder airlift reactor

Hydrodynamics and oxygen mass transfer characteristics of petroleum based micro-emulsions in a packed bed split-cylinder airlift reactor

CFD Simulation of Liquid Dispersion in Bubble Column

CFD Simulation of Liquid Dispersion in Bubble Column

Contact Info

Product

Resources

About