A circular copper pipe of inner diameter 2 cm and wall thickness 1 mm is carrying water at 1 L/s. It is placed in a cross flow (perpendicular to the pipe flow axis) at 1 m/s of 0 oC atmospheric pressure air. The entering water is liquid at 100 oC, at sufficiently high pressure to keep it fully liquid. Use copper, water, and air properties given in supplementary material. What length of pipe is required for an average water temperature drop of 2oC from the entry temperature? The heat capacity of water is 4.18 kJ/ (kg K).

A circular copper pipe of inner diameter 2 cm and wall thickness 1 mm is carrying water at 1 L/s. It is placed in a cross flow (perpendicular to the pipe flow axis) at 1 m/s of 0 oC atmospheric pressure air. The entering water is liquid at 100 oC, at sufficiently high pressure to keep it fully liquid. Use copper, water, and air properties given in supplementary material. What length of pipe is required for an average water temperature drop of 2oC from the entry temperature? The heat capacity of water is 4.18 kJ/ (kg K).

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