ConstPConstVReactorsLect8ME525SP2011

ConstPConstVReactorsLect8ME525SP2011 - ME 525: Combustion...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lecture Topics Constant pressure, fixed mass reactor. General form for reaction mechanisms. Constant volume, fixed mass reactor. School of Mechanical Engineering, Purdue University
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Constant-Pressure, Fixed Mass Reactor The enthalpy of the system can change because the molar enthalpy of a particular species j changes.
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

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.

Page1 / 19

ConstPConstVReactorsLect8ME525SP2011 - ME 525: Combustion...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online