How does the viscosity of a fluid being...

How does the viscosity of a fluid being...

Question 1 of 270705eccef9bbacbc34ba4d4553b

How does the viscosity of a fluid being pumped affect the operation of a spur gear pump?

Question 1 of 27070

Q

How does the viscosity of a fluid being pumped affect the operation of a spur gear pump?

🔍 Key Concepts

• Positive displacement pumps vs. centrifugal pumps and how they react to viscosity changes • How spur gear clearances and internal leakage (slip) change with thicker vs. thinner fluids • Typical service uses of spur gear pumps (fuel oil, lube oil, hydraulic oil, etc.)

💭 Think About

• Think about whether gear teeth moving trapped pockets of liquid are helped or hurt by a thicker, more viscous fluid. • Consider what happens to internal leakage (slip) between the gear teeth and casing when the liquid is very thin vs. fairly thick. • Ask yourself: are spur gear pumps usually chosen for very watery liquids, very thick oils, or a broad range of oil viscosities?

✅ Before You Answer

• Check whether positive displacement pumps generally become more or less efficient with higher viscosity fluids. • Verify in your notes what types of oils and fuels are commonly pumped with spur gear pumps. • Make sure the option you pick does not contradict the known fact that spur gear pumps are widely used in engine lube and fuel systems.