Liquid-side mass transfer coefficient for gas slugs rising in liquids

✍ Scribed by M.T. Sena Esteves; J.R.F. Guedes De Carvalho

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 852 KB
• Volume: 48
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(93)85005-a

✦ Synopsis

The present work reports a series of' experimental measurements of liquid-side mass transfer coefficient for slugs rising in liquids with viscosities in the range 0.9 x IO-'-0.14 Pas. Three column diameters were used (19,32 and 52 mm) and slugs with values of L/D up to 38 were studied. The data obtained compare well with the theoretical predictions of van Heuven and Beck and they show the limited range of applicability of the empirical equations of Filla and Niranjan et rrl. The data reported for slugs rising in water in the 52 mm i.d. column clearly suggest that transition .O turbulent film flow occurs at a value of r/D of about 1 I, the mass transfer in the turbulent portion being well predicted by correlations developed for wetted wall columns. A simple asymptotic expression for the evaluation of mass transfer coefficients in long slugs (i.e. slugs alongside which fully developed film flow is observed over a large portion of the total length) in viscous liquids was also developed and it is seen to compare very well with the experimental data.