Question: Helium is throttled from 1.2 MPa, 20C, to a pressure of 100 kPa. The diameter of the exit pipe is so much larger than the

Helium is throttled from 1.2 MPa, 20°C, to a pressure of 100 kPa. The diameter of the exit pipe is so much larger than the inlet pipe that the inlet and exit velocities are equal. Find the exit temperature of the helium and the ratio of the pipe diameters.

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