Abstract
The effects of tube bank configuration on forces and heat transfer were investigated for both two-dimensional and three-dimensional gas fluidized beds. Effective dynamic forces and heat transfer coefficients were measured for several tube bank configurations, and it was found that the average forces are smaller than for a single tube. The heat transfer coefficient can be increased by providing sufficient space for particles to descend around both sides of the tube bank. The results provide useful guidelines for optimizing the configuration of tube banks to achieve high heat transfer coefficients while reducing tube erosion due to dynamic forces.
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References
Kennedy, T.C., Donovan J.E. and Trigas A., Forces on immersed tubes in fluidized beds, AIChE J., 23, 351–357, (1981).
Grace J.R. and Hosny N., Forces on horizontal tubes in gas fluidized beds, Chem. Eng. Res. Des., 63, 191–198 (1985).
Nagahashi Y., Asako Y., Lim K.S. and Grace J.R., Dynamic Forces on a horizontal tube due to passing bubbles in fluidized beds, Powder Technology, 98-2, 177–182, (1998).
Nagahashi Y., Grace J. R., Lim K.S. and Asako Y., The Mechanism of Forces on Tubes Immersed in Gas-fluidized Beds, Proc. IChemE World Congress on Particle Technology 3, CD-Rom (F-18), Brighton, UK, (1998).
Hosny, N. and Grace, J.R., Transient forces on tubes within an array in a fluidized bed, AIChE J., 30, 974–976, (1984).
Nagahashi Y., Grace J.R., Lim K.S. and Asako Y., Buffeting Forces on Tubes in Large-Particle Fluidized Beds: Facilities and Single Tube Results, Selected Papers of Eng. Chem. & Metallurgy-1997, 66–73, (1998).
Nagahashi Y., Grace J. R., Asako Y., Epstein N., Lee D.H. and Yokogawa A., Effect of Liquid Addition on Heat Transfer in Gas-Fluidized Beds of Large Light Particles, J Proc. Mech. Eng. (Proc. Instn. Mech. Engrs., Part E ), 217, 279–286, (2003).
Bi, H.T., Cui, H., Grace, J.R., Kern, A., Lim, C.J., Rusnell, D., Song, X. and McKnight, C., Flooding to gas-solids countercurrent flow in fluidized beds, Ind. Eng. Chem. Res., 43, 5611–5619 (2004).
Lese, H. K. and Kermode, R. I., Heat transfer from a horizontal tube to a fluidized bed in the beneath of unheated tubes, Can. J.Chem.Eng., 50, 44–48, (1972).
Noack, R., Chem. Ing. Tech., Localer Wärmeübertragung an Horizontalen Rohren in Wirbelschichten, 42, 371–376, (1970).
Grace, J.R. and Harrison, D., The Effect of Internal Baffles in Fluidized Beds: a Guide to Design, IChemE. Symp. Series, No. 27, 93–100, (1968).
Baskakov, A.P. and Baerg, B.W., Chapter 10, in “Fluidization” ed. Davidson, J.F. and Harrison, D., Academic Press, 471–540, (1971).
Nagahashi Y. and Hirayama N., Heat Transfer from a Horizontal Tube in a fluidized Bed (Maximum Heat Transfer Coefficient and Optimum velocity), Heat Transfer Japanese Research, 13-2, 36–64, (1984).
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Nagahashi, Y., Grace, J.R., Lim, KS. et al. Dynamic force reduction and heat transfer improvement for horizontal tubes in large-particle gas-fluidized beds. J. Therm. Sci. 17, 77–83 (2008). https://doi.org/10.1007/s11630-008-0077-y
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DOI: https://doi.org/10.1007/s11630-008-0077-y