Water flowing through a large number of long, circular, thin-walled tubes is heated by means of hot parallel plates above and below the tube array. The space between the plates is evacuated and the plate and tube surfaces may be approximated as black bodies.

(a) Neglecting axial variations, determine the tube surface temperature, T_s, if water flows through each tube at a mass rate of m = 0.20 kg/s and a mean temperature of Tm = 300 K.

(b) Compute and plot the surface temperature as a function of flow rate for 0.05 m 0.25 kg/s.

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1, 1000 K D- 15 mm Water flow S- 20 mm 060000 7= 300 K =0.20 kgis Vacuum T, = 1000 K