Therefore, solid shaft diameter is calculated by Step 2: Design of shaft Design of solid shaft subjected to shear stressįor selected motor power rated torque and maximum torque is calculated as given below: 1 – Power number against Reynolds number of some turbine impellers īased on impellers selected the layout of the shaft is done as shown in Fig.2. For given type of agitation flat paddle impeller is used as given below:Īfter selection of impeller dimensionless number Reynold’s number is calculated as given belowįrom generic agitator curve, as shown in Fig.1, impeller power number is calculated based on calculated Reynold’s number.įig. Flat paddle, turbine, anchor type, pitched blade impellers are used most commonly. Selection of impeller is done based on application and type of flow. Solution: Step-1: Power calculations and selection of motorįor required power calculations, selection of the type of impeller is very important to achieve required agitation power. Here we will discuss the design of agitator vessel based on practical data inputs as given below: Type of fluid and its physical state, the degree of agitation and geometry of vessel are key factors in the design and selection of agitator components. Mixing is accomplished by the rotating action of an impeller in the continuous fluid. It may include mixing of liquid with liquid, gas with a liquid, or solids with liquid. In industries mixing of fluids is necessary for many chemical processes. Agitators are machines used in industries for mixing fluids.
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