Q2 Twenty lbm/s of ethylene gas (assumed to behave ideally) flow steadily at 60F in a pipe line whose internal diameter is 8 in. The pressure at upstream location 1 is P= 60 psia, and has fallen to P2 = 25 psia at downstream location 2. Why does the pressure fall, and what are the velocities of ethylene at the two locations? Data: I Molecular weight of ethylene = 28 (lbf/in)ft lbmol. R Universal gas constant= 10.73 PH20-62.3 lbm/ ft- Acceleration due to gravity = 32.2 fts- lbm.ft Sc= 32.2- lbf. s R F + 460 =

Q2 Twenty lbm/s of ethylene gas ( assumed to behave ideally) flow steadily at 60F in a pipe line whose internal diameter is 8 in. The pressure at upstream location 1 is P=60psia, and has fallen to P2=25psia at downstream location 2 . Why does the pressure fall, and what are the velocities of ethylene at the two locations? Data: Molecular weight of ethylene =28 Universal gas constant =10.73lbmolR(lbf/in2)f3;R=F+460 P1120=62.3lbm/ft3 Acceleration due to gravity =32.2fts2 gc=32.2Ibfs2lbmft