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

preparation of nylon

Diode: It allows the current to flow in one direction only and offers infinite resistance in other direction. It rectifies the alternating current that is why we call it rectifie

Space mass and weight: The geometric region occupied by bodies called as space. When body changes its position w. r.t. the other bodies, then body is known to be in motion.

First Law for Closed System Undergoing Change of State - thermodynamics: In accordance to first law, when system undergoes a thermodynamic process (change of state) heat and w

Larson-Miller parameter: For material of example of calculate life in hours at temperature of 900oC, and at σ = 20 MPa. Solution Larson-Miller parameter is given by

1. Produce the SW parts for the lugs, connector and tubes. Produce an assembly to FIT at the designated points. 2. Create your own, individual, blank, customised drawing te

Exhaust Manifold : The pipe which connects the exhaust system to the exhaust valve of the engine through which the products of combustion escape into the atmosphere is called the