+1 vote
in Fluid Mechanics by (118k points)
A cylinder of 0.8 m3 in volume contains superheated steam at 70℃  and .4 N/m^2 absolute pressure. The superheated steam is compressed to .3 . Find pressure and temperature.

(a) 0.74 N/m^2, 422.3℃

(b) 1.48 N/m^2, 422.3℃

(c) 0.74 N/m^2, 844.6℃

(d) 1.48 N/m^2, 844.6℃

This question was addressed to me in my homework.

The query is from Thermodynamic Properties & Compressibility in portion Properties of Fluids of Fluid Mechanics

1 Answer

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Best answer
Right choice is (a) 0.74 N/m^2, 422.3℃

Easiest explanation: For polytropic process,

                      P2=(v1/v2)n *P1

                          =(0.8/0.3)1.3 * 0.4                    ……..(for superheated stream n=1.3)

                          =.74 N/m2

                      T1=P1v1/nR=422.3℃.

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