Question: Water flows down at 0.2 m/s on the vertical wall of a house, which is known to have a height of 7.55 m and a

Water flows down at 0.2 m/s on the vertical wall of a house, which is known to have a height of 7.55 m and a width of 5 m. The paint has a diffusivity of 2.3 x 10^-9 cm²/s in water. Can you estimate the mass transfer rate of paint from wall through the water on this wall. The solubility of paint in water is 25 mg/m³. Can you estimate the thickness of a stationary film if one were to assume that all the mass resistance occurs in a film later adjacent to the wall?

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