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Computational simulation of aerosol behaviour Jouni Pyykönen Lectio Praecursoria 22. 3. 2002

Computational simulation of aerosol behaviour Jouni Pyykönen Lectio Praecursoria 22. 3. 2002. Aerosols - Important in many processes. Many dimensions in aerosol issues. Particle size. Particle composition. Physico-chemical conditions in the gas phase. Particle shape. Flow fields &

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Computational simulation of aerosol behaviour Jouni Pyykönen Lectio Praecursoria 22. 3. 2002

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  1. Computational simulation of aerosol behaviour Jouni Pyykönen Lectio Praecursoria 22. 3. 2002

  2. Aerosols - Important in many processes

  3. Many dimensions in aerosol issues Particle size Particle composition Physico-chemical conditions in the gas phase Particle shape Flow fields & residence times

  4. Aerosol formation in a laminar flow reactor

  5. Simulation results Particle concentration [#/Ncm3] Nucleation rate [#/Ncm3/s] Saturation ratio [ - ] 5E4 600 3E5 4E4 2E5 400 3E4 2E4 1E5 200 1E4 0 0 0

  6. Accuracy of the simulations Vs. experiments Computationally

  7. Deposit Formation Turbulent flow in panel heat heat exchangers

  8. Stagnation point boundary layer 1000 30 Fume: 20 g/Nm3 NaCl: 1 g/Nm3 Flow: 5 m/s, 900 C Surface: 480 C Max Saturation: CFD: 24.0 SPM: 24.3 400 0 21 1.5 0 16 3.1 0.41 2.7 0.4 2.0 0.0

  9. Deposition & Sootblowing cycle Temperature [C] Deposit height [mm] Fume: 20 g/Nm3 NaCl: 1 g/Nm3 Flow: 5 m/s, 900 C 0 150 Dep. rate [g/m2/min] 0 150 NaCl Dep. rate [g/m2/min]

  10. Computational simulation of aerosol behaviour Jouni Pyykönen Lectio Praecursoria 22. 3. 2002

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