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Maximum Semi-fluidization Velocity of Gas-liquid-solid Semi-fluidized Beds


Affiliations
1 Department, National Institute of Technology, Raipur -492001, India
2 Department, National Institute of Technology, Raipur-492001, India
3 Department, Raipur Institute of Technology, Raipur -492001, India
     

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Semi-fluidized beds are found to have wide applications in process industries. In the present study hydrodynamic viz., maximum semi-fluidization velocity of gas-liquid-solid semi-fluidized bed has been studied. The necessity of generalized correlation for the prediction of maximum semi-fluidization is emphasized. Experiments have been conducted in a 100 mm ID, 1.8m height vertical Plexiglas column using air, water and solid (of different densities) in order to develop a good understanding of each flow regime in gas-liquid-solid semi-fluidization. It is found that maximum semi-fluidization velocity is strong function of superficial gas velocity, particle size, particle density and bed expansion ratio. Values of the maximum semi-fluidization velocity, obtained from experimental investigations have been compared with calculated values.

Keywords

Gas-liquid-solid semi-fluidization, Maximum Semi-fluidization Velocity, Correlation, Expansion Ratio, Particle Size.
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  • Chern, S. H., Fan L. S. and Muroyama K., Hydrodynamics of Cocurrent gas-Liquid Solid Semi-fluidization with Liquid as the Continuous Phase, AIChE Journal. 1984; 30(2); 288-294.

  • Fan, L.T. and Wen, C.Y., Mechanics of Semi-fluidization of single size particles in solid-liquid systems, AIChE Journal. 1961; 7; 606-610.

  • Ho, T.C., Yau S.J. and Hopper, J.R., Hydrodynamics of Semifluidization in Gas-Liquid systems, Powder Technology. 1987; 50; 25-34.

  • Jena, H. M., Roy, G. K. and Meikap, B. C., Prediction of gas holdup in three phase fluidized bed from bed pressure drop measurement, Chemical Engineering Research and Design. 2008; 86; 1301-1308.

  • Kunii D. and Levenspiel O., Fluidization Engineering. 2nd ed. Butterworth-Heinemann, MA, USA, 1991.

  • Murthy J. S. N. and Roy G. K., Semi-fluidization: a Review, Indian Chemical Engineer 1986; 29 (2); 9-22.

  • Shrivastava P. V., Soni A. B., Kumar H. K., Prediction of Minimum semi-fluidization Velocity of Gas-liquid-solid Semifluidized beds, International Journal of Chemical Sciences. 2012; 10(4).

  • Roy, G. K. and Sharma, K. J. R., Dynamics of Liquid-Solid Semi-fluidization: Prediction of Semi-fluidization Velocity and Packed Bed Formation, Indian Journal of Technology. 1973; 2; 237.

  • Sen Gupta, P. and Roy, G. K., Prediction of the Packed Bed Height in Gas-Solid Semi-fluidization, Ind. Eng. Chem. Process Des. Develop. 1974; 13(63); 219-221.

  • Singh, R. K., Maharathy, A. K. and Mahapatra, A. K., Prediction of Pressure Drop in Three-phase Semi-fluidized Bed for Nonspherical Particles, Chemical Engineering World. 2005; 40 (9); 86-88.

  • Soni A. B., Kumar H. and Shrivastava Pooja V., Studies on Momentum transfer aspects of semi-fluidized bed in annular section, IUP Journal of Chemical Engineering, 2010; 2(4); 37-42.


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  • Maximum Semi-fluidization Velocity of Gas-liquid-solid Semi-fluidized Beds

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Authors

Pooja V. Shrivastava
Department, National Institute of Technology, Raipur -492001, India
A. B. Soni
Department, National Institute of Technology, Raipur-492001, India
H. Kumar
Department, Raipur Institute of Technology, Raipur -492001, India

Abstract


Semi-fluidized beds are found to have wide applications in process industries. In the present study hydrodynamic viz., maximum semi-fluidization velocity of gas-liquid-solid semi-fluidized bed has been studied. The necessity of generalized correlation for the prediction of maximum semi-fluidization is emphasized. Experiments have been conducted in a 100 mm ID, 1.8m height vertical Plexiglas column using air, water and solid (of different densities) in order to develop a good understanding of each flow regime in gas-liquid-solid semi-fluidization. It is found that maximum semi-fluidization velocity is strong function of superficial gas velocity, particle size, particle density and bed expansion ratio. Values of the maximum semi-fluidization velocity, obtained from experimental investigations have been compared with calculated values.

Keywords


Gas-liquid-solid semi-fluidization, Maximum Semi-fluidization Velocity, Correlation, Expansion Ratio, Particle Size.

References