Transcription of Lecture 14 - Multiphase Flows Applied …
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Lecture 14 - Multiphase Flows Applied …
1 Lecture 14 - Multiphase FlowsApplied Computational Fluid DynamicsInstructor: Andr Andr Bakker (2002-2006) Fluent Inc. (2002)2 Definitions Multiphase flow is simultaneous flow of: Materials with different states or phases ( gas, liquid or solid). Materials with different chemical properties but in the same state or phase ( liquid-liquid systems such as oil droplets in water). The primary and secondary phases: One of the phases is continuous (primary) while theother(s) (secondary) are dispersed within the continuous phase. A diameter has to be assigned for each secondary phase to calculate its interaction (drag) with the primary phase. A secondary phase with a particle size distribution is modeled by assigning a separate phase for each particle Dilute versus dense phase: Refers to the volume fraction of secondary phase(s).
5 bubbly flow droplet flow particle-laden flow slug flow annular flow free-surface flow Multiphase flow regimes • Bubbly flow: discrete gaseous bubbles in a continuous liquid.
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