100 kg/s of a crude oil is heated from 20°C to 40°C through the tube side of a multitube heat exchanger. The crude oil flow is divided evenly among all 100 tubes in the tube bundle. The ID of each tube is 10 mm, and the inside tube- wall temperature is maintained at 100°C. Average properties of the crude oil are ρ = 950 kg/m3, cp = 1.9 kJ/kg·K, k = 0.25 W/m·K, μ = 12 mPa·s, and μw = 4 mPa·s. Estimate the rate of heat transfer and the tube length.
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