ConstPConstVReactorsLect8ME525SP2011

# ConstPConstVReactorsLect8ME525SP2011 - ME 525: Combustion...

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ME 525: Combustion Lecture 8: Coupling Chemical and Thermal Analyses: Constant P, Constant V Reactors Prof. Robert P. Lucht Room 87, Mechanical Engineering Building School of Mechanical Engineering Purdue University est Lafayette Indiana West Lafayette, Indiana Email: Lucht@purdue.edu Phone: 765-494-5623 ebruary 2011 School of Mechanical Engineering, Purdue University February 3, 2011

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Lecture Topics Constant pressure, fixed mass reactor. General form for reaction mechanisms. Constant volume, fixed mass reactor. School of Mechanical Engineering, Purdue University
Constant-Pressure, Fixed Mass Reactor Consider a piston-cylinder arrangement with a perfectly homogeneous mixture of reactants. Assume constant ass and pressure for the system as combustion occurs mass and pressure for the system as combustion occurs. T, V, and mole fractions all change as reaction occurs. Reactor schematic: - Perfectly mixed, P = const =T(t) homogeneous composition - = constant T = T(t) V= V(t) = [X t) m constant -Uniform T, [X j ] throughout the School of Mechanical Engineering, Purdue University [X j ] [X j ](t) cylinder

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Constant-Pressure, Fixed Mass Reactor U du dm du First law: dU QW m u m dt dt dt dt  du t dh t P d t  v But: dt dt dt Assume only work is P dv work: v dd u Q m P m dt dt  v dh d dh mm P Q m t dt dt School of Mechanical Engineering, Purdue University dt
Constant-Pressure, Fixed Mass Reactor In terms of the system composition: h H N h jj j  mm where N is the total number of moles of species j. j The time derivative of the enthalpy is given by 1 dN dh dh hN dt m dt dt         School of Mechanical Engineering, Purdue University

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Constant-Pressure, Fixed Mass Reactor The enthalpy of the system can change because the molar enthalpy of a particular species j changes.
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## This note was uploaded on 12/27/2011 for the course ME 525 taught by Professor Lucth during the Fall '11 term at Purdue University-West Lafayette.

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ConstPConstVReactorsLect8ME525SP2011 - ME 525: Combustion...

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