Chemical Engineering Thermodynamics
The adiabatic throttling process of a perfect gas is one of constant enthalpy

Which can be performed in a pipe with a constriction
In which there is an increase in temperature
In which there is a temperature drop
Which is exemplified by a non-steady flow expansion

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Chemical Engineering Thermodynamics
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)S and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) )

(∂P/∂V)S = [(∂P/∂V)T]Y
(∂P/∂V)S = (∂P/∂V)T
(∂P/∂V)S = 1/y(∂P/∂V)T
(∂P/∂V)S = y(∂P/∂V)T

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