Chapter 7, Problem 7.9P

Interpretation Introduction

(a)

Interpretation:

The sign $\left(+\text{or}-\right)$ of $\Delta {\stackrel{·}{E}}_{\text{k}}$ and $\Delta {\stackrel{·}{E}}_{\text{p}}$ without doing calculations are to be predicted.

Concept introduction:

Kinetic energy for a fluid that enters into a system with some mass flow rate and linear velocity is expressed as,

${\stackrel{·}{E}}_{\text{k}}=\frac{1}{2}\stackrel{·}{m}{u}^2$

Interpretation Introduction

(b)

Interpretation:

The value of $\Delta {\stackrel{·}{E}}_{\text{k}}$ and $\Delta {\stackrel{·}{E}}_{\text{p}}$ by assuming that methane behaves as an ideal gas is to be calculated.

Concept introduction:

Kinetic energy for a fluid that enters into a system with some mass flow rate and linear velocity is expressed as,

${\stackrel{·}{E}}_{\text{k}}=\frac{1}{2}\stackrel{·}{m}{u}^2$

Interpretation Introduction

(c)

Interpretation:

An explanation for the result that $\Delta {\stackrel{·}{E}}_{\text{k}}\ne -\Delta {\stackrel{·}{E}}_{\text{p}}$ is to be stated.

Concept introduction:

Kinetic energy for a fluid that enters into a system with some mass flow rate and linear velocity is expressed as,

${\stackrel{·}{E}}_{\text{k}}=\frac{1}{2}\stackrel{·}{m}{u}^2$