During a throttling process, the temperature of a fluid drops from 30 to –20°C. Can this process occur adiabatically?

A 0.08-m rigid tank initially contains saturated water vapor at 180 °C. The tank is connected by a valve to a supply line that carries steam at 1400 kPa and 400 °C. Now the valve is opened, and steam is allowed to enter the tank. Heat transfer takes place with the surroundings such that the temperature in the tank remains constant at 180 °C at all times. The valve is closed when it is observed that one-third of the volume of the tank is occupied by liquid water. Find (a) the amount of steam that has entered the tank, and (b) the amount of heat transfer. 1400 kPa Steam 400°C Saturated vapor Qout V=0.08 m T, = 180°C

Air enters a 28-cm diameter pipe steadily at 200 KPa and 20oC with a velocity of 5 m/s. Air is heated as it flows, and leaves the pipe at 180 KPa and 40oC. Determine the mass flow rate of air in kg/s. R for air is 0.287 KJ/Kg-K.

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