Air with a temperature of T1 = 90 (degree C) and a velocity of v1 = 15 [m/s] ent

Question

Air with a temperature of T1 = 90 (degree C) and a velocity of v1 = 15 [m/s] enters into a cylindrical tube of a heat exchanger. The diameter of the tube is d = 130 [mm]. At the outlet of the heat exchanger the air is cooled down to T2 = 20 [degree C]. The pressure can be assumed constant along the whole tube. According to measurements the density of the air is given in the form: rho(t) = 352.977/T Calculate the velocity at the end of the tube! Calculate the mass flow rate at the end of the tube!

Explanation / Answer

mass flow rate remains constant as mass cannot be stored within a control volume

= Av = (352.977 / 363 )*( * 0.132 / 4 )*15 kg/s

velocity at the end of the tube =

(352.977 / 363 )*15 = (352.977 / 293 )*v

calculate v

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