Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s...

Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s and a temperature of 16°C. The pipe’s inner diameter is 4 cm, and its length is 4 m. The first half of the pipe is kept at a constant wall temperature of 100°C. The second half of the pipe is subjected to a constant heat flux of 200 W. The properties of air at 80°C are ρ = 0.9994 kg/m³, k = 0.02953 W/m·K, v = 2.097 × 10^–5 m²/s, c_p = 1008 J/kg·K, and Pr = 0.7154.

Determine the wall temperature at the exit of the tube.

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