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Question

Air is flowing steadily in an insulated duct. The pressure and specific volume measurements of the air at two station A and B are

Station A Station B
Pressure 100 kPa 98 kPa
Specific volume 0.81 m3/kg 0.97 m3/kg

Take Cp=1.005kJ/kgK;Cv=0.718kJ/kgK. What is direction of air flow in duct?

A
A to B
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B
B to A
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C
Can take place in either direction
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D
No flow of air takes place
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Solution

The correct option is A A to B
Assume flow takes places from A to B

SBSA=Cvln(PBPA)+Cpln(VBVA)



=0.718ln(98100)+1.005ln(0.970.81)

=0.0145+0.181

=0.166kJ/kgK

Since ΔS is positive,

Therefore. flow takes place from A lo B.

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