Dynamics of the Cocurrent-upflow Fixed-bed Column

Most of the data for the flow regimes described above were obtained with large particle diameters (dp 0.2 cm). Eisenklam and Ford5 and Saada26 obtained the data characterizing the flow regime for small particles (dp 0.2 cm). They 

Recommendations For an air-water system, as a first approximation, the flow regime can be predicted from-either Fig. 7-1 or Fig. 7-2(b). The effects of the particle diameter (particularly for small particles) and the fluid properties on the flow transition need to be examined both experimentally as well as theoretically. 

An early study on the pressure drop for cocurrent upflow through a packed bed was reported by Turpin and Huntington.37 They obtained data with the use of an air-water system and 5.1-, I0.2-, and 15.3-cm-diameter columns packed with tubular alumina particles of 0.76 and 0.82 cm in diameter. Gas flow rates extending from about 7.8 through 2,298 g cm 2 h-1 and liquid flow rates having a range of 2.347 through 19,560 g cm-2 h-1 were used. The data were correlated by an 

The above relation covers the parts of both the bubble-flow and pulsed.- (or slug-) flow regimes. Z is defined in Fig. 7-4. 

Ford6 measured the pressure drop in beds packed with approximately l-mm-diameter particles. He identified the flow regime based on the flow that takes place inside the pores, namely, single-phase pore flow and two-phase pore flow. He presented correlations 

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