11 - CHE 378 Heat and Mass Transfer Spring 2008 Homework 11...

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CHE 378: Heat and Mass Transfer Spring 2008 Homework 11 Due: Friday, April 18, 2008 at the beginning of lecture 1. Middleman 6.54 2. In a textbook on unit operations, the following statement was made: For a given mass-transfer operation, K L , was experimentally measured to be 2.54 x 10 -3 kg mole/m 2 -s-(kg mole/m 3 ) and k L was evaluated to be 8.47 x 10 -4 kg mole/m 2 -s- (kg mole/m 3 ). Since this is a 1-to-3 ratio, there must have been 2/3 of the resistance to mass transfer in the gas phase. Criticize or verify this statement. 3. In a wetted-wall tower where ammonia, NH 3 , was stripped from an ammonia-water solution into an air stream, the overall gas coefficient, K G , was 3.12 x 10 -9 kg mol/m 2 - s-Pa. At a plane in the tower, the bulk concentration of the falling aqueous stream was 4 kg mol/m 3 of solution and the partial pressure of ammonia in the rising gas stream was 3.04 x 10 3 Pa. For dilute solutions of ammonia in water at the operating temperature, the equilibrium partial pressure may be evaluated by
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11 - CHE 378 Heat and Mass Transfer Spring 2008 Homework 11...

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