(b) A 10 m long and 10 mm inner diameter pipe made of commercial steel (roughness height = 0.046 mm) is used to heat a l

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B A 10 M Long And 10 Mm Inner Diameter Pipe Made Of Commercial Steel Roughness Height 0 046 Mm Is Used To Heat A L 1 (52.37 KiB) Viewed 36 times

(b) A 10 m long and 10 mm inner diameter pipe made of commercial steel (roughness height = 0.046 mm) is used to heat a liquid in an industrial process. The liquid enters the pipe with Tin = 25°C and V = 0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe so that the fluid exits at Texit = 75°C. Taking the average fluid properties to be: p= 1000 kg/m³, C = 4000 J/kgK, μ = 2x10-3 kg/m.s, k = 0.48 W/mK, and Pr = 10, determine: (i) the required surface heat flux produced by the heater, [4 Marks] (ii) the surface temperature of the pipe at the exit, [11 Marks] (iii) the pressure loss through the pipe and the minimum power required to overcome the resistance to flow. [4 Marks]