Air (Pr = 0.7, k = 0.026 W/m . K) at 200°C flows across 2-cm-diameter tubes whose surface temperature is 50°C with a Reynolds number of 8000. The Churchill and Bernstein convective heat transfer correlation for the average Nusselt number in this situation is

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Nu (a) 8.5 kW/m² (d) 12.2 kW/m² 0.3 + 0.62 Re0.5Pr0.33 [1 + (0.4/Pr) 0.6710.25 (b) 9.7 kW/m² (c) 10.5 kW/m² (e) 13.9 kW/m²