The significance of liquid stream and warm exchange with a alter in stage emerges from the truth that numerous mechanical forms depend on these marvels for materials handling or for vitality exchange; e.g. petroleum handling, paper-pulping, control plants. Classical thermodynamics tells us that a stage is a plainly visible state of matter which is homogeneous in chemical composition and physical structure; e.g., a gas, fluid or strong of a unadulterated component. Two-phase stream is the least complex case of multiphase stream in which two stages are show for a unadulterated component. In some cases the term "multi-component" is utilized to portray streams in which the stages comprise of materials of distinctive chemical substances. For illustration, a stream of steam and water is a two-phase stream with a single component, while an air-water stream is a two-phase/two component stream. In blood stream the plasma/platelet- corpulses are a two-phase/multi-component stream (liquid/solid). In a few applications one can have a single stage of two immiscible liquids.