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← ScienceWhich outcome occurs when a saturated refrigerant at high pressure undergoes rapid throttling?
A)Vapor fraction increases downstream rapidly✓
B)Supercooled liquid presence at outlet
C)Temperature remains constant invariably
D)Uniform single-phase vapor region forms
💡 Explanation
Increased vapor fraction occurs because the Joule-Thomson effect during throttling causes a pressure drop and partial vaporization. Therefore, the refrigerant flashes to a lower temperature, creating vapor, rather than remaining liquid or stabilizing as a superheat vapor.
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