Fast fluidization experimental studies

The parametric effect of system pressure on the heat transfer coefficient was studied by Wirth (1995). They obtained experimental measurements of the heat transfer Nusselt number for fast fluidized beds... 

Han, G. Y., Experimental Study of Radiative and Particle Convective Heat Transfer in Fast Fluidized Beds, Ph.D. Dissertation, Lehigh University (1992)... 

Lu, C., and Wang, Z. Experimental Studies on Commercial Fast Fluidized Bed at High Temperature (in Chinese), The Proceeding of 5th National Conference on Fluidization, pp. 122-125 (1990). 

Experimental studies have been conducted by Bi et al. (1990) in a fast fluidized bed 186 mm in inside diameter at ambient temperature. FCC particles with a mean size of 48 fan were employed, and three cylindrical heat probes, 10 mm in diameter and 40,80 and 160 mm in length, respectively, were used. The probes, made of copper-sheathed inner heating elements, were instrumented with thermocouples 40 mm apart on the surface for the measurement of surface temperature. Located 2.9 m above the distributor, the probe was installed either upward or downward (see Fig. 5), and was moved along the radial direction by two connecting sticks for the measurement of heat transfer coefficients for different orientations and at different radial positions. 

Han GY. Experimental study of radiative and particle convective heat transfer in fast fluidized beds. PhD dissertation, Dept, of Chem. Eng., Lehigh University, Bethlehem, PA, 1992. 

Studies that report local particle flux data are summarized in Table 4. For the fast fluidization flow regime, radial profiles of local particle flux are generally similar in shape to the radial profiles of particle velocity described above upward near the center line, dropping off with increasing r, and negative near the wall. One such experimental profile, shown in Figure 11, is seen to be symmetrical around the axis of the column. Note that the flux is downward in this case only in a thin region adjacent to the outer wall of the column. 

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