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A smooth tube 5 cm in diameter and 450 cm in length is placed inside another...

A smooth tube 5 cm in diameter and 450 cm in length is placed inside another tube larger in diameter. Air enters the smaller diameter tube at a pressure of 5 bars, a mean temperature of 16 oC , and at a flow rate of 29 gm/s. saturated steam at 1.523 bar in the annulus between the two tubes condenses on the surface 0f the inside tube find:

  • The outlet temperature of air
  • The outlet pressure of air
  • The mass flow rate of condensate leaving the tube

For air (p=atms) ρ= 5.391 kg / m3, cp =1008 J / kg⋅K, μ= 196.4×10−7 N⋅s / m2,                        k =0.0281W/ m⋅K, Pr = 0.703.For steam hfg = 2183 kJ/kg.

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