hw15bsol-dist

hw15bsol-dist - CBE 320 Transport Phenomena Solutions...

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CBE 320 December 8, 2009 Transport Phenomena Problem Session XV Part B: Mass Transport 1. Reaction in a packed bed reactor. A tubular packed bed reactor (radius R ) contains stationary catalyst particles that cause species A to react via A products as illustrated in the fgure below. v z = constant R=-k’ ac A1 A () z c z=0 = c AA 0 Although the reaction is actually heterogeneous, the apparent homogeneous reaction rate (occurring over a volume containing many particles) is given by R A = ( k 0 1 a ) c A , where a is the surFace area per unit volume. The presence oF the particles causes the velocity profle to be uniForm (i.e., v z = constant). Assuming that the inlet concentration oF A in inert liquid B is c A 0 , that diFFusion is negligible relative to convection (in which case the convective molar ±ux can be written N A,z = c A v z ), that the process occurs at constant temperature, and that mass transFer limitations to reaction are negligible, use a shell mass balance to determine the steady-state concentration oF species A
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hw15bsol-dist - CBE 320 Transport Phenomena Solutions...

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