Fundamentals of Heat Engines. Jamil Ghojel

Fundamentals of Heat Engines - Jamil Ghojel


Скачать книгу
href="#fb3_img_img_dbce28c1-dd0a-5429-abdb-541c3e738218.png" alt="equation"/>

      From Eqs. (1.40), (1.41), and 1.42,

      (1.44)equation

      Example 1.1

      A gas mixture has the following mass composition:

equation equation

      Determine the molar composition of the mixture.

      Solution

equation
Gas % Mass fraction Mass fraction, ci Molecular mass, μi Mole fraction, ci/μi % Mole fraction
CO 2 17.55 0.175 5 44 0.003 99 images
O 2 4.26 0.042 6 32 0.001 33 images
N 2 76.33 0.763 3 28 0.027 26 images
CO 1.86 0.018 6 28 0.000 66 images
100 ci = 1.0 ci/μi = 0.03324 Total = 100

      1.3.2.1 Dalton Model of Gas Mixtures

equation equation

      For the components,

equation equation

      Since n = nA + nB,

equation

      or

      (1.45)equation

      pA and pB are known as the partial pressures.

equation equation equation

      Therefore,

equation

      It can be shown that the internal energy and enthalpy of a mixture of two gases (A and B) can be written as

equation equation

      The gas constants for the ith component and gas mixture are, respectively,

equation

      Using Eq. (1.43), we obtain

      (1.46)equation

      For the two‐gas mixture

equation

      1.3.3 Processes in Ideal Gas Systems

      The terms in Eq. 1.47 are as follows:

       Pressure p is in N/m2 or Pa.

       Volume V is in m3.

       Mass m is in kg.

       Temperature T is in K.

       Specific volume v is in m3/kg.

       Molar amount of gas n is in kmole (1 kmole of any gaseous substance occupies a volume of 22.41 m3 at the standard temperature 0°C and pressure 101.325 Pa).

       Gas constant in J/kg. K.

       Molecular mass of any gas μ is in kg/kmole.

       Universal gas constant

      1.3.3.1 Adiabatic Processes

      An


Скачать книгу