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Question

Dry air, flowing at a velocity of \( 1.5 \mathrm{~m} / \mathrm{s} \), enters a 6 -m-long, 0.15 -m-diameter tube at \( 310 \mathrm{~K} \) and \( 1.013 \times 105 \mathrm{~Pa} \). The inner surface of the tube is lined with a felt material (diameter-to-roughness ratio, \( D / \varepsilon \), of 10,000 ) that is continuously saturated with water at \( 290 \mathrm{~K} \). Assuming constant temperature of the air and the pipe wall, determine the exit concentration of water in the exit gas stream. Diffusivity of water in air at \( 300 \mathrm{~K}=2.6 \times 10^{-5} \mathrm{~m}^{2} / \mathrm{s} \) Kinematic viscosity of air at \( 300 \mathrm{~K}=1.569 \times 10^{-5} \mathrm{~m}^{2} / \mathrm{s} \) The vapor pressure of water at \( 290 \mathrm{~K}=17.5 \mathrm{~mm} \mathrm{Hg} \) The gas constant \( =0.08206 \mathrm{~L} \cdot \mathrm{atm} / \mathrm{mol} \cdot \mathrm{K} \) The Fanning friction factor is given by: \( f=0.00791 R e^{0.12} \)

          Dry air, flowing at a velocity of \( 1.5 \mathrm{~m} / \mathrm{s} \), enters a 6 -m-long, 0.15 -m-diameter tube at \( 310 \mathrm{~K} \) and \( 1.013 \times 105 \mathrm{~Pa} \). The inner surface of the tube is lined with a felt material (diameter-to-roughness ratio, \( D / \varepsilon \), of 10,000 ) that is continuously saturated with water at \( 290 \mathrm{~K} \). Assuming constant temperature of the air and the pipe wall, determine the exit concentration of water in the exit gas stream.
Diffusivity of water in air at \( 300 \mathrm{~K}=2.6 \times 10^{-5} \mathrm{~m}^{2} / \mathrm{s} \)
Kinematic viscosity of air at \( 300 \mathrm{~K}=1.569 \times 10^{-5} \mathrm{~m}^{2} / \mathrm{s} \)
The vapor pressure of water at \( 290 \mathrm{~K}=17.5 \mathrm{~mm} \mathrm{Hg} \)
The gas constant \( =0.08206 \mathrm{~L} \cdot \mathrm{atm} / \mathrm{mol} \cdot \mathrm{K} \)
The Fanning friction factor is given by: \( f=0.00791 R e^{0.12} \)

Dry air, flowing at a velocity of 1.5 m / s, enters a 6 -m-long, 0.15 -m-diameter tube at 310 K and 1.013 × 105 Pa. The inner surface of the tube is lined with a felt material (diameter-to-roughness ratio, D / ε, of 10,000 ) that is continuously saturated with water at 290 K. Assuming constant temperature of the air and the pipe wall, determine the exit concentration of water in the exit gas stream.
Diffusivity of water in air at 300 K=2.6 × 10^-5 m^2 / s
Kinematic viscosity of air at 300 K=1.569 × 10^-5 m^2 / s
The vapor pressure of water at 290 K=17.5 mmHg
The gas constant =0.08206 L·atm / mol·K
The Fanning friction factor is given by: f=0.00791 R e^0.12

Added by Ricky M.

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