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When dry and saturated steam is caused to expand in a nozzle,the actual measured steam flow is found to be greater than the theoretical calculated flow.This is due to the time lag in the condensation of steam & the steam remains in dry state instead of wet. Such a steam is called supersaturated steam.

This time lag is cause due to the the face that, the converging part of the nozzle is to short and the steam velocity is too high that the molecules of steam have insufficient time to form droplets.

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12y ago

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