- #1
Ibn_Nizar
- 1
- 0
Hi,
I'm stuck. Can someone help me out?
Problem:
The properties of a certain fluid are related as follows:
u=196+0.718t
pv=0.287(t+273)
(a)where 'u' is the specific internal energy(Kj kg), t is in degress Celsius, p is pressure(Kn/m2) and v is specific volume (m3 kg).For this fluid. Find Cp and Cv
(b)A system composed of 2 kg of the above fluid expands in a frictionless piston and cylinder from an initial state of 1 Mpa, 100degrees Celsius to a final temp of 30degress Celsius.If there is no heat transfer, find the net work for the process.
--------------------------------
This is what i have tried:
in (a), i tried to link the two equations together, so that i could get 'u' and 'pv' in the same equation:
u=196+2.5(pv-78.35)
I'm stuck now.How do i proceed? i know the formula for cp and cv, which is Cp=(do)u/(do)t
cv=(do)Q/(do)T .How do i use these formulas with respect to the above equation?
(b)I'm totally confused on this one. I don't know where to start.All i could understand is to find the work done, and that Q=0.
Thanks.
I'm stuck. Can someone help me out?
Problem:
The properties of a certain fluid are related as follows:
u=196+0.718t
pv=0.287(t+273)
(a)where 'u' is the specific internal energy(Kj kg), t is in degress Celsius, p is pressure(Kn/m2) and v is specific volume (m3 kg).For this fluid. Find Cp and Cv
(b)A system composed of 2 kg of the above fluid expands in a frictionless piston and cylinder from an initial state of 1 Mpa, 100degrees Celsius to a final temp of 30degress Celsius.If there is no heat transfer, find the net work for the process.
--------------------------------
This is what i have tried:
in (a), i tried to link the two equations together, so that i could get 'u' and 'pv' in the same equation:
u=196+2.5(pv-78.35)
I'm stuck now.How do i proceed? i know the formula for cp and cv, which is Cp=(do)u/(do)t
cv=(do)Q/(do)T .How do i use these formulas with respect to the above equation?
(b)I'm totally confused on this one. I don't know where to start.All i could understand is to find the work done, and that Q=0.
Thanks.