Liquid mercury is flowing at 0.6 kg/s through a 5-cm-diameter tube with inlet and outlet mean temperatures of 100°C and 200°C, respectively. The tube surface temperature is maintained constant at 250°C. Determine the tube length using (a) the appropriate Nusselt number relation for liquid metals and (b) the Dittus–Boelter equation. (c) Compare the results of (a) and (b).

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