Development of counter-current flow limitation model applicable to a sharp-edged liquid entrance

There are many industrial machines that function by operation of multi-phas e fluids. Some of them take advantage of the characteristics of counter-cur rent two-phase flow. The maximum flow rates of gas and liquid phases which flow in opposite-directions (counter-current flow) are limited by a phenome non known as a Counter-Current Flow Limitation (CCFL or flooding). The mass and momentum conservation equations for two phases were established to bui ld a system of first-order partial derivative equations (PDE). A new CCFL m odel was developed based on the characteristic equation of the first-order PDE system. The present model applies to the case in which a non-uniform fl ow is developed around a square or sharp-edged entrance of liquid phase. Th e model can be used to predict the operating-limit of components in which m ass and heat transfer are taking place between liquid and gas phases.