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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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A. Discussion Problems

A1. Suppose we have a volume of nitrogen plus a small amount of water vapor at 1.0 atm. The walls of the container are at 25°C, and there is a hot pipe at 105°C running through the volume. Explain the behavior predicted by Eq. (15-4a), the behavior predicted by Eq. (15-10b), and the reasons that Eq. (15-4b) more closely predicts reality.

A2. When is JA = NA, and when are they not equal?

A3. Explain why the infinite dilution Fickian diffusivities for a binary liquid system are not equal, Image.

A4. The constant in Eq. (5-23b) is 1.173 × 10–16, which agrees with Geankoplis (2003). However, Cussler (2009) and Wankat and Knaebel ( ...

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