Role of sparger design on gas dispersion in mechanically agitated gas‐liquid contactors

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Abstract
Critical impeller speeds for gas dispersion and gas recirculation were measured in 0.57, 1.0 and 1.5 m i.d. vessels, using visual observations, measurements of power consumption and liquid‐phase mixing time. A pitched blade down‐flow turbine impeller (PTD) was used. Design parameters of the PTD impeller such as diameter (0.22Tto 0.57T), blade width (0.25D to 0.4D) and blade thickness (2.8, 4.3 and 6.4 mm) were studied. The effect of sparger type and geometry on NCD has been investigated. For this purpose, pipe, ring, conical and concentric ring spargers were employed. Design details of the ring sparger such as ring diameter, number of holes and hole size were also studied in detail. The sparger location with respect to the impeller was found to be the most important parameter. Correlations have been developed for NCD and NCR.