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← ScienceWhich outcome results when exceeding the Knudsen number limit within miniature Stirling engines?
A)Decreased indicated thermal efficiency✓
B)Increased convective heat transfer
C)Enhanced momentum energy recovery
D)Improved isothermal compression rate
💡 Explanation
Reduced particle collisions cause gas rarefaction, where the mean free path approaches device dimensions; therefore, the finite rate heat transfer mechanism reduces energy conversion efficiency because gas deviates from continuum behavior rather than ideal cycling.
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