In an experiment, mercury at a local mean (bulk) temperature of 30°C flows through a horizontal pipe whose diameter is 1 cm, with a mass flow rate of 0.02 kg/s. The wall surface temperature is...

In an experiment, mercury at a local mean (bulk) temperature of 30°C flows through a horizontal pipe whose diameter is 1 cm, with a mass flow rate of 0.02 kg/s. The wall surface temperature is constant at 70°C. The flow can be assumed to be thermally developed. Calculate the heat transfer coefficient by assuming negligible axial conduction in mercury. Repeat the solution, this time accounting for the effect of axial conduction.