Fluid forces that are generated inside the...

Fluid forces that are generated inside the...

Question 1 of 270705eccefa3bacbc34ba4d47cf0

Fluid forces that are generated inside the coupling shown in the illustration, tend to separate the runner and impeller during operation when the __________. See illustration MO-0089.

Question 1 of 27070

Q

Fluid forces that are generated inside the coupling shown in the illustration, tend to separate the runner and impeller during operation when the __________. See illustration MO-0089.

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🔍 Key Concepts

• Hydraulic (fluid) coupling operation between runner and impeller • Effect of fluid fill level and ring valve position on internal pressure and force direction • How centrifugal force and viscosity affect separation or attraction of rotating elements

💭 Think About

• Look at the illustration MO-0089: when the coupling is operating at speed, where does the fluid tend to move—toward the center or toward the outer diameter, and what force does that create between the runner and impeller? • Which of the options would increase the internal hydraulic pressure acting radially and axially between the two elements, rather than weakening or venting that pressure? • Think about how air in the fluid or a lower viscosity would change the ability of the coupling to transmit torque and build pressure between the runner and impeller.

✅ Before You Answer

• Identify which option would cause the strongest, most continuous fluid film between the runner and impeller surfaces. • Check which condition would produce maximum centrifugal pumping action in the annular space between runner and impeller. • Eliminate any choice that would reduce pressure or shear forces in the fluid (such as venting, thinning, or aerating the fluid).