International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Experimental analysis and CFD simulations for heat transfer in sound assisted fluidized bed of fine powders

Fine powders in the size range of 20-200 μm are widely used in industries for fluid bed operations and are ideal for gas-solid reactions because of their large external surface areas and favorable heat transfer rates. The fine powders have very poor flow characteristics. Most of the earlier research work in heat transfer in bubbling fluidized beds is focused on coarse grained Geldart B and D particles. Acoustic energy of sufficient intensity and sound pressure level improved the quality of fluidization of fine powders. The objective of this investigation is experimental analysis and CFD simulations for heat transfer in a fluidized bed of fine powders at different acoustic conditions. The Eulerian approach has been identified as an efficient method for the numerical simulation of fluidized beds. The experimental and CFD results are in good agreement with each other.
PAPER REVISED: 2015-08-06
PAPER ACCEPTED: 2015-08-06
  1. Karamavruc, A., et al., Deduction of Fluid Bed Heat Transfer Coefficients Using One and Two Dimensional Analysis, Powder Technology,80(1984),pp. 83-91
  2. Kuipers, J.,et al., Numerical Calculation of Wall-to-Bed Heat Transfer Coefficients in Gas-fluidized Beds, AIChE, 30(1992), pp. 1079-1091
  3. Nowak, H., et al., Fluidization and Heat Transfer in an Acoustic Field, AIChE Symposium Series, 89(1993),pp. 137-149
  4. Chirone, R.,et al., Bubble-free Fluidization of a Cohesive Powder in an Acoustic Field, Chemical Engineering Science,48(1993), pp. 41-51
  5. Sunderesan, R., Clark ,N,N., Local Heat Transfer Coefficients on the Circumference of a Tube in a Gas Fluidized Bed, International Journal of Multiphase Flow,21(1995),pp. 1003-1024
  6. Miyamoto,M.,et al., Unsteady Heat Transfer and Particle Behavior Around a Horizontal Tube Bundle Near an Expanded Bed Surface of a Gas Fluidized Bed-Conditional Sampling Statistical Analysis, International Journal of Heat and Mass Transfer,38(1995),pp. 3263-3273
  7. Levy, E., Bubbling Fluidization of Fine Powders in a High Intensity Acoustic field, Proceedings International Fluidization Conference, Durango, Colorado,1998
  8. Schmidt, A., Renz, U., Eulerian Computation of Heat Transfer in Fluidized Beds, Chemical Engineering Science,54(1999), pp. 5515-5522
  9. Huang , D., Edward, L., Gas Gap at the Surface of a Horizontal Tube in a Bubbling Fluidized Bed, Powder Technology,140(2004), pp. 131-135
  10. Wang, L.,et al., Effects of Solid Particle Properties on Heat Transfer Between High Temperature Gas Fluidized Bed and Immersed Surface, Applied Thermal Engineering,24(2004), pp. 2145-2156
  11. Schmidt, A., Renz, U.,Numerical Prediction of Heat Transfer Between a Bubbling Fluidized Bed and an Immersed Tube Bundle, Heat Mass Transfer,41(2005), pp. 257-270
  12. Guo, Q, et al., Influence of Sound Wave Characteristics on Fluidization Behaviors of Ultrafine Particles,Chemical Engineering Journal,119(2006), pp. 1-9
  13. Natale, F.D., et al., Surface-to-bed Heat Transfer in Fluidized Beds: Effect of Surface Shape, Powder Technology,174(2007),pp. 75-81
  14. Gao, W.M.,et al., Computational Simulation of Gas Flow and Heat Transfer Near an Immersed Object in Fluidized Beds, Advances in Engineering Software,38(2007), pp. 826-834
  15. Natale, F.D.,et al.,A single Particle Model for Surface-to-bed Heat Transfer in Fluidized Beds, Powder Technology,187(2008), pp. 68-78
  16. Wankhede,U.S.,et al., Effect of Acoustic Field on Heat Transfer in a Sound Assisted Fluidized Bed of Fine Powders, International Journal of Multiphase Flow, 37(2011),pp. 1227-1234
  17. Escudero,D.R., Acoustic Field Effects on Minimum Fluidization Velocity in a 3D Fluidized Bed, Graduate Research Symposium, Iowa State University, 2012
  18. Ajbar,A., et al., Fluidization of Nano-powders: Effect of Sound Vibration and Pre-mixing with Group A particles, Powder Technology,2011,pp. 327-337