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Role of sparger design on gas dispersion in mechanically agitated gas‐liquid contactors
Author(s) -
Rewatkar V. B.,
Joshi J. B.
Publication year - 1993
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450710215
Subject(s) - sparging , contactor , materials science , dispersion (optics) , nuclear engineering , mechanics , engineering , chemistry , thermodynamics , physics , optics , power (physics)
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 (0.22 T to 0.57 T ), blade width (0.25 D to 0.4 D ) and blade thickness (2.8, 4.3 and 6.4 mm) were studied. The effect of sparger type and geometry on N CD 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 N CD and N CR .