Flow patterns in agitated vessels In unbaffled tank there are strong tangential flows and vortex formation at moderate stirrer speeds With baffles, vertical flows are increased and rapid mixing of liquid. 2 or more impellers can be mounted on single shaft for a long vertical cylindrical tank Lowest impeller is usually a radial flow impeller ; the upper is axial flow Lowest impeller is about one impeller diameter above the bottom of the tank.
The function of the agitation system is to provide good mixing and thus increase mass transfer rates through the bulk liquid and bubble boundary layers. provide the appropriate shear conditions required for the breaking up of bubbles. The agitation system consists of the agitator and the baffles. The agitator consists of the components shown in
An agitator is a device or mechanism to put something into motion by shaking or stirring. There are several types of agitation machines, including washing machine agitators and magnetic agitators. Agitators can come in many sizes and varieties, depending on the application. In general, agitators usually consist of an impeller and a shaft. An impeller is a rotor located within a tube or conduit attached to the shaft. It helps enhance the pressure in order for the flow of a fluid be done. Modern i
Basic features of a stirred tank bioreactor A modern mechanically agitated bioreactor will contain: 11. Basic features * An agitator system * An oxygen delivery system *A foam control system * A temperature control system * A pH control system * Sampling ports * A cleaning and sterilization system.
pattern in the tank depends on the variations in these three components. Radial Component Longitudinal Component Tangential / Rotational Component
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An agitator is composed of a drive device , a guiding system of the shaft , a shaft and impellers . If the operating conditions are under high pressure or high temperature, the agitator must be equipped with a sealing system to keep tightened the inside of the tank when the shaft is crossing it.
June 10, 2020
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