Relationship between two specific heat, Mechanical Engineering

Relationship between two specific heat ?

Sol:  dQ = dU + dW; for a perfect gas

dQ at constant pressure

dU at Constant volume; = mCvdT = mCv(T2  - T1)

dW at constant pressure = PdV = P(V2  - V1) = mR(T2  - T1) Putting all values we get

dQ = mCv(T2  - T1) + mR(T2  - T1)

dQ = m(CV  + R)(T2  - T1)

but                      dQ = mCp(T2  - T1)

mCp(T2  - T1) = m(CV  + R)(T2  - T1)

Cp  = CV  + R; Cp - CV  = R                                                                                                  ...(i)

Now divided by Cv; we get

Cp /CV  - 1 = R/Cv; Since Cp /CV  = y (gama = 1.41)

y - 1 = R/Cv;

or                          Cv  = R/ (y - 1);     CP  = yR/ (y - 1); CP>CV; y>1

 

Posted Date: 10/15/2012 2:21:27 AM | Location : United States







Related Discussions:- Relationship between two specific heat, Assignment Help, Ask Question on Relationship between two specific heat, Get Answer, Expert's Help, Relationship between two specific heat Discussions

Write discussion on Relationship between two specific heat
Your posts are moderated
Related Questions
Changes in Mechanical Properties along with Tempering: Tempering enhances the toughness and ductility of quenched steel though decreases hardness. Following figure demonstrate

impartance of moulding sand

Find out the components of the force: The frame of a certain machine accelerates to the right at 0.8 g m/sec 2 . As illustrated in Figure, it carries a uniform bent bar ABC we

Determine reactions of the overhanging beam: Determine r eactions at points A and B of the overhanging beam as shown in the figure given below.

Maximum elastic torque: A rectangular section torsion member had dimension of 100mm by 200 mm and is built of a steel for which the shear yield point is τ y = 100 MPa. Find o

Multimeter: This is used to measure voltage, current and resistance of an electrical circuit (Figure). Figure: Multimeter

Q.What is Metal working processes? Metal working processes are processes used to produce wrought products. These product include angles, channels, I-beams, round, squar

1- Explain the rationale of using a small WD to improve resolution. 2- In a tungsten SEM , Why does a high accelerating voltage provide the potential for higher resolution?  Why

The wing of a light, single-engine general aviation aircraft has an area of 15.8 m 2 and a span of 9.6 m. The airfoil of the wing is NACA 65-415, which has a lift slope of 0.1033

EXPLAIN THE COMPOUND BELT DRIVES