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

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Presentation transcript:

Computational simulation of aerosol behaviour Jouni Pyykönen Lectio Praecursoria

Aerosols - Important in many processes

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

Aerosol formation in a laminar flow reactor

Simulation results Saturation ratio [ - ] Nucleation rate [#/Ncm 3 /s] Particle concentration [#/Ncm 3 ] E5 2E5 1E5 5E4 4E4 3E4 2E4 1E

Accuracy of the simulations Computationally Vs. experiments

Deposit Formation Turbulent flow in panel heat heat exchangers

Stagnation point boundary layer Fume: 20 g/Nm 3 NaCl: 1 g/Nm 3  C Flow: 5 m/s, 900  C  C Surface: 480  C Max Saturation: CFD: 24.0 SPM:

Deposition & Sootblowing cycle Fume: 20 g/Nm 3 NaCl: 1 g/Nm 3  C Flow: 5 m/s, 900  C Deposit height [mm] Dep. rate [g/m 2 /min] Temperature [  C] NaCl Dep. rate [g/m 2 /min]

Computational simulation of aerosol behaviour Jouni Pyykönen Lectio Praecursoria