Origin of disturbances in cocurrent gas-liquid packed bed flows

Flow Regime Transitions in Trickle‐bed Reactors with Structured Packings

“…These periodic components are no longer observed for higher liquid velocities. This behavior is very different from the one found for a conventional TBR with random packing, where the pulsing flow is clearly identified from the appearance of pulses at regular intervals, which increase their frequency as the fluid velocities are increased (Helwick et al, 1992;Krieg et al, 1995;Horowitz et al, 1997).…”

“…For example, Frank et al (1999) did not observe a trickling-pulsing flow transition in a TBR packed with SPs for the same conditions where they did observe a change in the conventional TBR. In the last decade, many articles have put in evidence that features of time series of characteristic variables, mainly pressure fluctuations, measured in different multiphase reactors constitute robust objective tools capable of diagnosing sharp variations in the underlying dynamics as those found in flow regime transitions (Helwick et al, 1992;Krieg et al, 1995;Horowitz et al, 1997;Letzel et al, 1997;Daw et al, 1998;van Ommen et al, 2000;Johnsson et al, 2000).…”