Heating phenomenon in a nozzle

AI Thread Summary
In supersonic flow within nozzles, heat is generated due to friction at the nozzle walls, leading to a smaller than expected enthalpy drop and reduced nozzle efficiency. This phenomenon, often associated with viscous heat generation, can impact performance in applications like superheated steam. The original poster is seeking a specific term for this phenomenon, recalling "metaheating," but finds no relevant information. The discussion emphasizes the importance of understanding heat effects in nozzle design and operation. Overall, recognizing these thermal effects is crucial for optimizing nozzle efficiency.
ajd12
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Hello ,

I have a rather odd question. I am trying to find a phenomenon that occurs in nozzles but am quite unable to name the phenomenon per se. The vague description of the phenomenon I remember is that when a supersonic flow occurs in a nozzle (or superheated steam), there is heat produced due to the friction generated at the nozzle walls. This causes the enthalpy drop to be lesser than expected, hence an issue with nozzle efficiency arises. I am not looking for the difference in isentropic and adiabatic expansion in nozzles. I remember a vague name for this phenomenon (metaheating) but a search does not come up with anything.
 
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I think the OP is thinking of viscous heat generation.
 

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