EULER-EULER TWO-FLUID MODEL BASED CODE DEVELOPMENT FOR TWO-PHASE FLOW SYSTEMS
The flow regimes of gas-liquid two-phase flow in a vertical
pipe depend upon the drag as well as non-drag (Lift, Virtual
mass, turbulent dispersion, wall lubrication, etc.) forces.
The effect of these forces in a code is incorporated by the closure models of the interphase forces for the momentum exchange between the continuous and dispersed phases. In the present work, different drag models with and without the effect of bubbles swarm and shear rate of continuous phase are investigated in the in-house code. The code is based on the Euler-Euler two-fluid model. The code is validated against the experimental data of Monros-Andreu et al. (2013, EPJ Web Conf. 45, 01105). The radial distribution of the volume fraction, gas velocity and slip velocity has been presented for different gas and liquid flow rates. The predictions from the sets of inter-phase closure models
presented in this paper yielded satisfactory results. It has been found that a set of Ishii-Zuber drag coefficient model with bubble swarm effect by Roghair and shear effect by Magnaudet model, Tomiyama lift coefficient model, Hosokawa and Tomiyama wall force model, and Lopez de Bertodano turbulent dispersion force model was found to provide the best agreement with the experimental data.