50 kg  water per minute is to be heated from 30°C to 50°C by passing through a pipe of 2cm diameter. the pipe is heated by condensing the system keeping its inner surface at 100°C . find the length of pipe required.  Take the following properties of water at mean bulk temperature of 40°C, density= 965 kg/m^3, v= 0.33*10^-6 m^2/sec , Cp= 4200J/kgK ,k= 0.585W/mK

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