Oxy-fuel combustion power plants use pulverized coal particles as fuel to burn in a pure oxygen environment to generate electricity. Before entering the furnace, pulverized spherical coal particles with an average diameter of 300 μm are transported at 2  m / s through a 3-m-long heated tube while suspended in hot air. The air temperature in the tube is 900^∘ C, and the average convection heat transfer coefficient is 250 W / m^2 ·K. Determine the temperature of the coal particles at the exit of t

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