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Questions and Answers
In terms of flow pattern analysis, which component is perpendicular to the impeller shaft?
In terms of flow pattern analysis, which component is perpendicular to the impeller shaft?
- Radial (correct)
- Centrifugal
- Axial
- Tangential
Which term describes a flow component parallel to the impeller shaft?
Which term describes a flow component parallel to the impeller shaft?
- Radial
- Lateral
- Tangential
- Axial (correct)
Which component of flow pattern analysis is typically parallel to the circle of rotation around the impeller shaft?
Which component of flow pattern analysis is typically parallel to the circle of rotation around the impeller shaft?
- Tangential
- Orthogonal
- Radial
- Axial (correct)
What type of flow component is tangential to the circle of rotation around the impeller shaft?
What type of flow component is tangential to the circle of rotation around the impeller shaft?
What flow pattern component is perpendicular to both the axial and tangential components?
What flow pattern component is perpendicular to both the axial and tangential components?
What type of flow is desired when using turbines with blades set at a 90-degree angle to their shaft?
What type of flow is desired when using turbines with blades set at a 90-degree angle to their shaft?
In what direction are the blades set in turbines that are designed for radial-tangential flow?
In what direction are the blades set in turbines that are designed for radial-tangential flow?
What is the main characteristic of turbines designed for radial-tangential flow?
What is the main characteristic of turbines designed for radial-tangential flow?
Which flow type is least likely to be achieved with turbines having blades set at a 90-degree angle to their shaft?
Which flow type is least likely to be achieved with turbines having blades set at a 90-degree angle to their shaft?
How are the blades oriented in turbines to achieve radial-tangential flow?
How are the blades oriented in turbines to achieve radial-tangential flow?
What is the primary direction of circulation in this type of mixer?
What is the primary direction of circulation in this type of mixer?
Which concentration gradients may persist even after prolonged operation?
Which concentration gradients may persist even after prolonged operation?
What happens to the concentration gradients in the tangential direction over time?
What happens to the concentration gradients in the tangential direction over time?
Which statement best describes the persistence of concentration gradients in this type of mixer?
Which statement best describes the persistence of concentration gradients in this type of mixer?
How do jets differ from propellers?
How do jets differ from propellers?
What is a common method of operating jets, as described in the text?
What is a common method of operating jets, as described in the text?
Why is the process of continuous mixing often desirable?
Why is the process of continuous mixing often desirable?
What is a key advantage of continuous mixing over batch mixing?
What is a key advantage of continuous mixing over batch mixing?
In the context of mixers, what role do jets play?
In the context of mixers, what role do jets play?
What type of flow do these impellers tend to induce?
What type of flow do these impellers tend to induce?
Where does the tangential flow induced by these impellers primarily occur?
Where does the tangential flow induced by these impellers primarily occur?
What effect does the tangential flow induced by the impellers have on mixing?
What effect does the tangential flow induced by the impellers have on mixing?
Under what conditions might some mixing occur due to tangential flow?
Under what conditions might some mixing occur due to tangential flow?
What is primarily formed due to swirl and vortex formation caused by these impellers?
What is primarily formed due to swirl and vortex formation caused by these impellers?
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Study Notes
Circulation in Mixers
- Circulation in mixers is primarily tangential, leading to persistent concentration gradients in axial and radial directions even after prolonged operation.
Flow Pattern Analysis
- The flow pattern in mixers can be broken down into three components:
- Radial (perpendicular to the impeller shaft)
- Axial or longitudinal (parallel to the impeller shaft)
- Tangential (tangential to the circle of rotation around the impeller shaft)
Jet Operation
- Jets can be operated by pumping liquid from the tank through the jet back into the tank.
Continuous Mixers
- Continuous mixing produces an uninterrupted supply of freshly mixed material, making it desirable for handling large volumes of materials.
Impeller Characteristics
- Impellers tend to induce tangential flow, which does not produce mixing, except possibly near tank walls where shear forces exist.
- Turbines with blades set at a 90-degree angle to their shaft are used to achieve radial-tangential flow.
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