THEORETICAL MODELING OF GAS-LIQUID 2-PHASE FLOW IN A VERTICAL AND STRAIGHT PIPE

This paper treats the theoretical analysis to obtain the flow characte ristics of gas-liquid two-phase mixtures in a vertical and straight pi pe. The system of equations governing the gas-liquid two-phase flow fi eld is based upon the multifluid model. The transitions of the gas flo w pattern from bubbly to slug flows as well as from slug to chum flows are introduced into the system of the above governing equations. In o rder to confirm the validity of the present theoretical model, the flo w characteristics calculated on the basis of this model have been comp ared with experimental data measured by changing the pipe diameter and the submergence ratio, As a result, it has been found that the presen t theoretical model built up in this investigation gives good fit to t he measured data. We believe that the simplicity of this pump can make it possible to transport molten iron/steel between different refining processes. But, we also note that the experiments have been performed an a cold model using an air-water system.