Question: Air is flowing in a 10-cm-constant diameter pipe at 50 m/s. At section 1 the temperature and pressure are 60C and 400 kPa, respectively. Heat

Air is flowing in a 10-cm-constant diameter pipe at 50 m/s. At section 1 the temperature and pressure are 60°C and 400 kPa, respectively. Heat is added to the air, and at section 2 downstream the temperature and pressure are measured to be 300°C and 380 kPa, respectively. Calculate the mass f;ux and the downstream velocity. Also, calculate the added heat transfer by
i) Neglecting the kinetic energy change,
ii) By including the kinetic energy change. Comment as to the importance of including the kinetic energy change. (Potential energy changes are ignored unless elevation changes are included.)

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State 1 V 1 50 ms T 1 60oC 333 K P 1 400 kPa State 2 T 2 300oC 573 K P 2 380 kPa We get the ... View full answer

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