Simulation of Multiphase Flows

COURSE CONTENT

ONE DIMENSIONAL TWO-PHASE FLOW. Homogeneous and separated two-phase flow. Equations of continuity and momentum. Equations of motion and pressure loss of general applicability. FREE FALL VELOCITY. Velocity ​​of free fall of solids on any carrier. Grain-shaped, pipe-wall effect, solids concentration at freefall rate. HYDRAULIC TRANSPORTATION OF SOLID MATERIALS. Equation of pressure loss and motion equation. THE AIR-PARTICLE MIXTURE FLOW. Fundamental air-particle airflow equations. Theory of Continuous medium. Constitutive equation. Equation of continuity and momentum. Interaction forces. Energy equation. TWO-DIMENSIONAL AIR-PARTICLE FLOW. The system of equations for the two-dimensional laminar and turbulent flow. Transport properties. Shear stress. Turbulent viscosity of air-particle flow. Develop equations with finite differences. TWO-PHASE FLOW OF LIQUID-GAS. Flow regimes and flow maps for vertical, horizontal, and inclined streams. CALCULATION OF PRESSURE LOSSES IN TWO-PHASE GAS-LIQUID FLOW. Homogeneous flow models, Lockhart-Martinelli, Baroczy-Chisholm, Friedel, Beggs-Brill, Baker-Jardine-Associates and the Dukler-Flanigan model. PHYSICAL-MATHEMATICAL DETERMINATION OF TWO-PHASE GAS-LIQUID FLOW . Flow model and magnitudes. Equations of continuity and momentum. VOID FRACTION. Void fraction in the homogeneous flow model. Void fraction for constant speed ratio. Model of Premoli. Model of Beggs-Brill. Shear stress on the wall. AIR-LIFT PUMPS. Theoretical analysis and design of hydropneumatic pumps (air-lift pumps).

LEARNING OUTCOMES

It is a subject of specialization and aims to give to the Mechanical Engineer student the basic and advanced knowledge of the flow behavior of the fluids during the simultaneous flow of several phases in pipelines.

Basic knowledge will allow for the approximate calculation of two-phase and/or multiphase flow installations, and with the advanced knowledge, it will be possible to simulate multiphase flows and solve various problems by methods of Computational Fluid Dynamics to achieve in-depth investigation of each problem.

This knowledge is necessary and is used in the professional activity and occupation of the Mechanical Engineer in the transport of solid particles by means of air (food industry, cement industry, flour industry) or water (extraction of minerals) or multiphase flows (oil extraction with simultaneous flow oil, gas, water and sludge) and of course in the chemical industry, where the simultaneous liquid-gas flow is encountered.