- #1
Urmi Roy
- 753
- 1
Hi,
I was under the impression that nozzles and diffusors are functionally just the opposite of each other...so their thermodynamics would be accordingly...however, recently we started gas dynamics and the picture doesn't seem to be quite as simple as that.
Looking at the Mollier diagram for the nozzle and diffusor, referring to pages 36 and 42 respectively in the book:
http://books.google.com/books?id=-o...ce=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
it seems that the isentropic(ideal) enthalpy, (represented by subscript 2s) for nozzle is less than the actual irreversible enthalpy (represented by subscript 2) for the nozzle, while they are equal for the diffusor...this further leads to differences in the thermodynamic analysis...why is there such a difference?
I was under the impression that nozzles and diffusors are functionally just the opposite of each other...so their thermodynamics would be accordingly...however, recently we started gas dynamics and the picture doesn't seem to be quite as simple as that.
Looking at the Mollier diagram for the nozzle and diffusor, referring to pages 36 and 42 respectively in the book:
http://books.google.com/books?id=-o...ce=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
it seems that the isentropic(ideal) enthalpy, (represented by subscript 2s) for nozzle is less than the actual irreversible enthalpy (represented by subscript 2) for the nozzle, while they are equal for the diffusor...this further leads to differences in the thermodynamic analysis...why is there such a difference?