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Which 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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