HW4_v2 - Chemical Engineering 150B- Fall 2005 Problem Set...

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Page 1 of 2 Chemical Engineering 150B- Fall 2005 Problem Set #4 Due Wednesday September 28 th , 2005 Note: There are 5 problems in this assignment (see back). Problem 1. (15 points) Consider liquid A evaporating into initially pure and incondensable gaseous B, which has no solubility in liquid A, in a closed adiabatic and isothermal vessel shown below: This vessel initially has 0.4 liter of A with 75 cm 2 of surface area in a total volume of 20 liters. After 4 minutes, the gas phase contains five percent A. Both A and B are ideal in the gas phase. (a) Calculate the mass transfer coefficient of A based on the initial flux of A? Note that the vessel is isothermal at 298 K, and the equilibrium vapor pressure of A at 298K is 24 torr. (b) Calculate how much time it will take to reach ninety percent saturation of A in B? Assume that the mass transport coefficient in (a) remains constant for all compositions and pressures for this part. Problem 2. (15 points) A 1-m square, thin plate of napththalene is oriented parallel to an air stream flowing at 30 m/s. The air is at 310 K and 1 atm. The plate is at 300 K. Determine the rate of sublimation from the top of the plate assuming a pseudo steady-state situation. [The following properties for naphthalene are known: Diffusivity of naphthalene is at 298 K =
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HW4_v2 - Chemical Engineering 150B- Fall 2005 Problem Set...

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