EULERIAN-LAGRANGIAN COMPUTATIONS ON PHASE DISTRIBUTION OF 2-PHASE BUBBLY FLOWS

A comprehensively theoretical model is developed and numerically solve d to investigate the phase distribution phenomena in a two-dimensional , axisymmetric, developing, two-phase bubbly flow. The Eulerian approa ch treats the fluid phase as a continuum and solved Eulerian conservat ion equations for the liquid phase. The Lagrangian bubbles are tracked by solving the equation of motion for the gas phase. The interphase m omentum changes are included in the equations. The numerical model suc cessfully predicts detailed flow velocity profiles for both liquid and gas phases. The development of the wall-peaking phenomenon of the voi d fraction and velocity profiles is also characterized for the develop ing flow. For 42 experiments in which the mean void fraction is less t han 20 per cent, numerical calculations demonstrate that the predictio ns agree well with Liu's experimental data. (C) 1997 by John Wiley & S ons, Ltd.