Liquid phase mixing in mechanically agitated vessels

Raghav Rao, K. S. M. S. ; Joshi, J. B. (1988) Liquid phase mixing in mechanically agitated vessels Chemical Engineering Communications, 74 (1). pp. 1-25. ISSN 0098-6445

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Liquid phase mixing and power consumption have been studied in 0.3, 0.57, 1.0 and 1.5 m i.d. mechanically agitated contactors. Tap water was used as liquid phase. The impeller speed was varied in the range 2-13.33 r/s. Three types of impellers namely disc turbine (DT), pitched turbine downflow (PTD) and pitched turbine upflow (PTU) were employed. The impeller diameter to vessel diameter ratio was varied in the range of 0.25 to 0.58. The effect of impeller clearance from tank bottom was also studied. Mixing time was measured using the transient conductivity measurement. The PTD impeller was found to be the most energy efficient for mixing in liquid phase alone. Further, PTD (T/3) was found to be most energy efficient as compared with other impeller diameters. The effect of clearance was found to be design dependent and it was found to be diameter dependent in the case of pitched turbines. Flow patterns of different impellers have been studied by visual observations (using guide particles). These observations were supported by the measurements using Laser Doppler Velocimetry. A model has been developed for the prediction of mixing time. In the case of all the three impeller designs, a fairly good agreement was found between the predicted and experimental values of mixing time.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Group.
Keywords:Mechanically Agitated Vessels; Mixing; Flow Patterns
ID Code:61030
Deposited On:13 Sep 2011 05:27
Last Modified:13 Sep 2011 05:27

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