Question

Difference convergent divergent nozzle and convergent divergent diffuser

Answer 1

Divergent nozzles slow fluids if the flow is subsonic, but they accelerate sonic or supersonic fluids. Convergent-divergent nozzles can therefore accelerate fluids that have choked in the convergent section to supersonic speeds.

Answer 2

Answer:

Convergent nozzles accelerate subsonic fluids. If the nozzle pressure ratio is high enough, then the flow will reach sonic velocity at the narrowest point (i.e. the nozzle throat). Divergent nozzles slow fluids if the flow is subsonic, but they accelerate sonic or supersonic fluids.