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- W3178114093 abstract "Gas–liquid (G-L) reaction kinetics studies need ideally to be carried out (a) in the total recirculation regime, signifying maximum mass transfer rates (KLS) and (b) in contactors, which geometrically support higher KLS. G-L mixing enhancement by agitation and gas sparging is generally practiced to enhance KLS. The agitated and sparged tank contactor (ASTC) consisting of baffles, stirrers, and spargers is the preferred mode of contacting. It is essential to understand how the impeller–sparger geometry affects KLS in a standard ASTC while operating in the total recirculation regime. A film theory-based approach shows that KLS may be approximated by the gas holdup (εg) in the total recirculation regime. Combinations of standard radial and axial impellers with ring spargers of different sizes are used in an ASTC of 0.25 m diameter containing 1 × 10–2 m3 water. The oxygen flow rate (Qg) is varied from (6.26 to 25.02 × 10–5) m3 s–1, and agitation intensity (N0) is varied from (1.67 to 16.67) rps at the temperature (θ) = 313 K under atmospheric pressure to understand the effects of geometry on εg while operating in the total recirculation regime. Results of our investigations show how an ASTC with an impeller of high-power number (NP) and a ring sparger of near impeller diameter (D) form an ideal combination and will result in maximum εg (indirectly optimum KLS), making it suitable for kinetics studies." @default.
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- W3178114093 date "2021-07-09" @default.
- W3178114093 modified "2023-10-06" @default.
- W3178114093 title "The Effect of Impeller–Sparger Geometry on the Gas Holdup in an Oxygen–Water System Using an Agitated and Sparged Tank Contactor" @default.
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- W3178114093 doi "https://doi.org/10.1021/acs.iecr.1c01435" @default.
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