29 At 1 std atm, 100C, the density of air = 0.9482 kg/m', the viscosity =...

  

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29 At 1 std atm, 100°C, the density of air = 0.9482 kg/m', the viscosity = 2.18 x 10-3 kg/m - s, thermal conductivity 0.0317 W/m K, and specific heat at constant pressure - 1.047 kJ/kg K. At 25°C, the viscosity 1.79 x 10-5 kg/m s. (a) Calculate the kinematic viscosity at 100°C, m'/s. O (6) Calculate the thermal diffusivity at 100°C, m?/s. (c) Calculate the Prandtl number at 100°C. (d) Assuming that for air at I std atm, Pr = Sc and that Sc = const with changing temperature, calculate D for air at 25°C. Compare with the value of D for the system O,-N, at 1 std atm, 25°C, 29 At 1 std atm, 100°C, the density of air = 0.9482 kg/m', the viscosity = 2.18 x 10-3 kg/m - s, thermal conductivity 0.0317 W/m K, and specific heat at constant pressure - 1.047 kJ/kg K. At 25°C, the viscosity 1.79 x 10-5 kg/m s. (a) Calculate the kinematic viscosity at 100°C, m'/s. O (6) Calculate the thermal diffusivity at 100°C, m?/s. (c) Calculate the Prandtl number at 100°C. (d) Assuming that for air at I std atm, Pr = Sc and that Sc = const with changing temperature, calculate D for air at 25°C. Compare with the value of D for the system O,-N, at 1 std atm, 25°C,