Which risk increases when a cryogenic pump cools liquid helium below its lambda point?

A)Onset of superfluid film creep✓

B)Increased vapor pressure inside rotor

C)Rapid thermal expansion of seals

D)Decreased convective heat transfer

💡 Explanation

Superfluidity causes film creep because helium undergoes a phase transition below the lambda point, allowing it to flow without viscosity along surfaces. Therefore, film creep increases rather than is restricted, despite standard assumptions being based only on vapor pressure.

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Which risk increases when a cryogenic pump cools liquid helium below its lambda point?

💡 Explanation

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