Mass transfer from a freely moving single sphere to the dense phase of a gas fluidized bed of inert particles

Prins, W. and Casteleijn, T.P. and Draijer, W. and Swaaij van, W.P.M. (1985) Mass transfer from a freely moving single sphere to the dense phase of a gas fluidized bed of inert particles. Chemical Engineering Science, 40 (3). pp. 481-497. ISSN 0009-2509

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Abstract:	Naphthalene spheres (particle diameter 2 < dn < 20 mm) were vaporized in beds fluidized by air at a temperature of about 65°C. The bed material consisted of inert glass beads or alumina in the size range 100 < dp < 700 μm. Mass transfer coefficients were measured by determining weight loss with time, as a function of dn, dp and the fluidization velocity U. The ratio dn/dp has been varied from 3 to 200. An interesting conclusion might be that there is no influence of the fluidization velocity on these transfer coefficients; they only depend on the minimum fluidization velocity Umf. The empirical correlation mf(jD)mfRemfm=0.105 + 1.505 (dn/dp)−1.05 with m = 0.35 + 0.29 (dn/dp)−0.50, as a best fit of all the results, is accurate within 15%. At dn/dp = 1 it links up very well with the results of Hsiung and Thodos. For large values of dn/dp agreement with known results of mass transfer measurements between a fluidized bed and a wall or an object is good.
Item Type:	Article
Copyright:	© 1985 Elsevier Science
Faculty:	Science and Technology (TNW)
Research Group:	Thermo-Chemical Conversion of Biomass (TCCB)
Link to this item:	http://purl.utwente.nl/publications/69528
Official URL:	http://dx.doi.org/10.1016/0009-2509(85)85109-5
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