Interpretation:
It should be shown that isobars in the vapor region of the Mollier diagram must have positive slope and positive curvature.
Concept Introduction:
Mollier diagram is graph between enthalpy and entropy. The slope of this diagram must be
And for the isobars or constant pressure, the slope of this diagram would be
For the positive curvature isobars
Must be positive.
Answer to Problem 6.1P
The slope of the isobar in this diagram is:
The curvature equation for the isobars is:
And it is positive
Explanation of Solution
Given information:
It is given that the fundamental equation
Differentiate given equation with respect to entropy keeping pressure constant
So, isobars in Mollier diagram has positive slope
As
So,
Which is positive
The isobars in Mollier diagram have straight lines because of constant pressure. This is the reason in superheated region with addition of heat at constant pressure, temperature keeps on increasing and if we draw them on enthalpy entropy curve it diverge from each other.
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Chapter 6 Solutions
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