EFFECTS OF HEIGHT TO DIAMETER RATIO AND AERATION RATE ON LIQUID MIXING AND HYDRODYNAMIC PROPERTIES IN A BUBBLE COLUMN

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PIRDASHTI M.; KOMPANI R.

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Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF CHEMICAL ENGINEERING Year:2009 | Volume:6 | Issue:3 Page(s): 46-56

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Title

EFFECTS OF HEIGHT TO DIAMETER RATIO AND AERATION RATE ON LIQUID MIXING AND HYDRODYNAMIC PROPERTIES IN A BUBBLE COLUMN

Author(s)

PIRDASHTI M. | KOMPANI R. | Issue Writer Certificate

Keywords

BUBBLE COLUMN

OVERALL GAS HOLDUP

RESIDENCE TIME DISTRIBUTION

AXIAL DISPERSION COEFFICIENT

MIXING TIME

Abstract

Experimental measurements of OVERALL GAS HOLDUP (eg), RESIDENCE TIME DISTRIBUTION (RTD) and liquid MIXING TIME (tm) have been carried out in an air-water system in a 17 lit BUBBLE COLUMN with an 11 cm diameter, over a wide range of superficial gas velocity (0.14-1.46 ms-1) and height to diameter ratio (1.36-8.84). The bed expansion method was used to obtain holdup values and the change of slope related to eg versus superficial gas velocity (Usg) indicated the transition point from homogeneous to heterogeneous regime at Usg= 0.7-0.9 ms-1. Besides, the experiments illustrated that H/D ratio had no effect on holdup values. The axial dispersion model was used with semi-closed boundary conditions for prediction of RTD, and hence, the AXIAL DISPERSION COEFFICIENTs (Dax). Moreover, fitting results of the model and experimental RTD curves achieved from tracer injection method attained the model parameter, Dax , in three H/D ratios of 4.73, 6.36 and 8.84. Results showed that an elevation in H/D ratio, caused a rise in Dax. On the other hand, the MIXING TIME data declined with an increase in Usg; however enhancement of H/D ratio caused an increase in tm.

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APA: Copy

PIRDASHTI, M., & KOMPANI, R.. (2009). EFFECTS OF HEIGHT TO DIAMETER RATIO AND AERATION RATE ON LIQUID MIXING AND HYDRODYNAMIC PROPERTIES IN A BUBBLE COLUMN. IRANIAN JOURNAL OF CHEMICAL ENGINEERING, 6(3), 46-56. SID. https://sid.ir/paper/298266/en

Vancouver: Copy

PIRDASHTI M., KOMPANI R.. EFFECTS OF HEIGHT TO DIAMETER RATIO AND AERATION RATE ON LIQUID MIXING AND HYDRODYNAMIC PROPERTIES IN A BUBBLE COLUMN. IRANIAN JOURNAL OF CHEMICAL ENGINEERING[Internet]. 2009;6(3):46-56. Available from: https://sid.ir/paper/298266/en

IEEE: Copy

M. PIRDASHTI, and R. KOMPANI, “EFFECTS OF HEIGHT TO DIAMETER RATIO AND AERATION RATE ON LIQUID MIXING AND HYDRODYNAMIC PROPERTIES IN A BUBBLE COLUMN,” IRANIAN JOURNAL OF CHEMICAL ENGINEERING, vol. 6, no. 3, pp. 46–56, 2009, [Online]. Available: https://sid.ir/paper/298266/en

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