Lecture 12

# Lecture 12 - Nuclear Waste Kinetics and CMBRs Lecture#12 reaction kinetics(transformation term review no flow constant volume decay problems

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1 Nuclear Waste, Kinetics, and CMBRs ± Lecture#12 ± reaction kinetics (transformation term) ± review no flow, constant volume decay problems ± reaction kinetics radioactive decay ± first order reaction, CMBR (ICP#10) ± Reading V: Ch. 4 (pg. 84-94); Ch. 5 (pg. 106- 108); V: 14.3 (pg. 400-405); N: Ch 2 (pg. 56-57) ; PS#1 due; PS#2 posted What you should know ± What is the order of a reaction? ± What are the units of a zero order rate constant? first order rate constants? ± Why is nuclear waste an issue? ± What is a batch or CMBR reactor? ± What is the form of the MBE for a CMBR assuming a first order decay reaction (ICP#10)? Reactor Types test tube, storage container, or world’s atmosphere lake, house, air over city pipe, river, channel, hallway, tunnel (L>> d or w) Mass flow rate balance equation ± accumulation rate = inflow rate – outflow rate + net transformation rate ± non-conservative: generation or decay, m rxn = ± VR ( for decay; + generation; R is the rate of reaction) ± no flow reactors: m in - m out = 0 ( Batch or CMBR : continuously mixed batch reactors) ± for constant volume: dm/dt = VdC/dt ± dm/dt = VdC/dt =m rxn dm/dt = m in - m out +m rxn Reaction kinetics ± R = rate of reaction (mass/volume-time g/L-d) ± m rxn = ± VR units of mass flow ( g/d); for decay; + generation ± R = kC n Where k is the rate constant, n is the order of reaction, and C is the contaminant concentration ± reaction order, n n=0; zero order n=1; first order n=2; second order ± unit of k depends on order such that

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## This note was uploaded on 04/17/2008 for the course CEE 260 taught by Professor Kimf.hayes during the Fall '06 term at University of Michigan.

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Lecture 12 - Nuclear Waste Kinetics and CMBRs Lecture#12 reaction kinetics(transformation term review no flow constant volume decay problems

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