Air enters an electrical furnace at 20o C, 100 kPa, with a volumetric flow rate

Question

Air enters an electrical furnace at 20o

C, 100 kPa, with a volumetric flow rate of 30

m3

/min. The furnace delivers air at 40o

C to a duct system with three branches consisting

of two 15-cm-diameter ducts and a 30-cm-diameter duct. The air behaves as an ideal gas,

and the pressure in the exit ducts is 100kPa. If the velocity in each 15-cm duct is 4 m/s,

determine, for steady operation:

a) The mass flow of air entering the furnace, in kg/s.

b) The volumetric flow rate in each 15-cm duct, in m3

/min.

c) The velocity in the 30-cm duct, in m/s.

Explanation / Answer

b) The volumetric flow rate in each 15-cm duct, in m3

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