Flow regime transitions in a bubble column with a paraffin wax as the liquid medium
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Gas hold-up measurements were made in a 0.051-m-diameter by 3.05-m-long glass bubble column with a molten paraffin wax as the liquid medium. For temperatures between 230 and 280 °C, there is a range of gas velocities where two modes of operation are possible, and they are referred to as the “foamy” and the “turbulent bubbling” flow regimes. The start-up velocity determines which flow regime will be obtained. Transitions between these two flow regimes occur and are influenced by the temperature (i.e., the liquid viscosity) and the gas distributor design. Lower temperatures and/or perforated plate distributors with larger holes favor the existence of the turbulent bubbling flow regime. Bach and Pilhofer's correlation provides a very good fit for gas holdups obtained in studies with orifice plate distributors in the absence of foam. © 1987, American Chemical Society. All rights reserved.
author list (cited authors)
Bukur, D. B., Petrovic, D., & Daly, J. G.