Gas holdup for high gas velocities in a gas–liquid cocurrent upward-flow system

✍ Scribed by Dong-Hyun Lee; John R. Grace; Norman Epstein

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 414 KB
• Volume: 78
• Category: Article
• ISSN: 0008-4034
• DOI: 10.1002/cjce.5450780518

✦ Synopsis

Abstract

Gas holdup has been measured in an 83‐mm diameter, 2.2‐m high column at high gas superficial velocities — 0.22 to 2.7 m/s — and at liquid (water) superficial velocities of 0 to 0.47 m/s, by means of a differential pressure transducer. The equation of Hills (1976) based on the slip velocity gives good predictions of the gas holdup for 0.1 ≤ E~g~ ≤ 0.4. However, the holdups predicted by this approach are considerably higher than the experimental values at gas velocities high enough that E~g~ > 0.4. Other equations from the literature are also shown to be inadequate. The new data and earlier data at high gas velocities are therefore correlated with a new dimensional equation for U~l~ ≤ 0.23 m/s.