A numerical model of gasfluidized beds
Kuipers, J.A.M. and Duin, K.J. van and Beckum, F.P.H. van and Swaaij, W.P.M. van (1992) A numerical model of gasfluidized beds. Chemical Engineering Science, 47 (8). pp. 19131924. ISSN 00092509

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Abstract:  A firstprinciples model for gasfluidized bed based on the socalled "twofluid model" (TFM) has been developed. In the TFM approach, both phases are considered to be continuous and fully interpenetrating. The equations of mass, momentum and thermal energy conservation, supplemented with the necessary constitutive equations, have been solved by a finitedifference technique on a minicomputer. The computer model calculates the porosity, the pressure, the fluid phase temperature, the solid phase temperature and the velocity fields of both phases in twodimensional Cartesian or axisymmetrical cylindrical coordinates. Contrary to previous modelling work, all important terms have been retained in the transport equations. As a test of the theoretical model, the phenomena associated with the formation propagation and eruption of a single bubble in a coldflow twodimensional airfluidized bed with one central orifice have been calculated theoretically. The calculation was done for monosized spherical solid particles with a diameter of 500 ¿m and a true density of 2660 kg/m3. Our preliminary calculations indicate strong leakage of bubble gas into the emulsion phase, especially during the initial stage of bubble formation. In its present state, the model does not correctly display all the details associated with the propagation of bubbles in gasfluidized beds. The further development of the model, both from a physical (bed rheology) and mathematical (finitedifference approximations) point of view, seems highly desirable 
Item Type:  Article 
Copyright:  © 1992 Elsevier Science Ltd 
Faculty:  Science and Technology (TNW) 
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Link to this item:  http://purl.utwente.nl/publications/13562 
Official URL:  http://dx.doi.org/10.1016/00092509(92)80309Z 
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