Transition to pulsing flow, holdup and pressure drop in packed columns with cocurrent gas-liquid downflow

✍ Scribed by J.R. Blok; J. Varkevisser; A.A.H. Drinkenburg

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 794 KB
• Volume: 38
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(83)80181-x

✦ Synopsis

Trickle beds of I meter in length and resp. 5, 10 and 20cm in diameter were operated in the so-called pulsing flow regime. The packing was 2.5 rcsp. 4 mm Raschig rings. Air was taken as the gas phase. Several liquids were used. In this contribution we describe the transition from gas-continuous to pulsing flow, the liquid holdup and the pressure drop over the column. The transition can be described by au effective Froude-number. Correlations are set up for the transition point as well as for the hold-up. Pressure drop is shown to be linearly dependent upon the pulse frequency. In a separate series of experiments the transition to pulsing flow was measured in a 5 mm capillary tube, used as a wetted wall column. It became clear, that the onset of pulsing flow in such a capillary is not determined by the same parameter as the onset of pulsing flow in a packed column.

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