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Conservation Equations Of Mass And Momentum Along With The Volume Fractions Of The Two Phases Have Been Solved Using An Eulerian-Eulerian Model To Predict The Circulation Flow Rate Of A Liquid In A Gas Driven System. The Two Phase Model Is An Interpenetrating Continuum Model Which Uses The Modified K-Ε Model For The Continuous Phase As A Closure. The Model Result Could Predict The Circulation Flow Rate In An Experimental System To A Reasonably Good Level Of Accuracy. Then The Model Was Extended To Predict The Circulation Flow Rate In Industrial Size Rh Degasser With One Up Leg And One Down Leg. The Model Could Predict The Trend Pretty Well, However The Circulation Flow Rate Observed In The Plant Could Not Be Predicted Very Well Due To Lots Of Constraints In The Model. The Major Constraint Was The Excessive Time That The Model Takes For Computation Of One Set Of Result And The Second Biggest Constraint Was The Thermal Model, The Incorporation Of Which Demands Still More Computational Time. So We Used A Discrete Phase Particle Modeling Instead Of The Interpenetrating Continuum Model To Reduce The Time Of Computation While Sacrificing Some Details Of The Model Computation And Thus Losing Also Some More Information But Could Get Reasonably Accurate Result Within 20 Days For Experimental Rh System As Well As For The Actual Plant Size Rh. With The Discrete Phase Particle Modeling We Could Predict The Circulation Flow Rate Of Water In The Experimental System To A Reasonable Level Of Accuracy. Then The Model Was Extended To Predict The Flow Rate In Plant Size Rh As Well As For Multi Leg Rh System. Interesting Results Could Be Obtained From Multi-Leg Rh System, Which Shows That The Circulation Flow Rate In The System Falls With More Up Legs And Increases With More Down Legs. In Order To Assess The Mixing Time In The Ladle, Where The Two Phase Flow Is Not Present, We Could Solve Only The Single Phase Flow Equations In The Ladle To Predict The Velocity Field Inside It With The Rh Being Detached From The Ladle, But Influencing Its Presence Through The Boundary Conditions Only. Then The Solution Of A Species Conservation Equation Was Used To Predict The Mixing Of A Species In The Ladle And Hence The Time Of Mixing Could Be Determined For The Ladle With Many Different Pertinent Input Parameters Which Are Extremely Important For The Plant. A General Correlation For The Mixing Time Could Be Developed Against The Input Parameters Which Can Be Used In The Plant To Control Process Parameters In Rh Operation. Key Words: Eulerian-Eulerian Two Phase Model, Eulerian-Lagrangian Discrete Particle Model, Rh Degasser, Multi Leg Rh System, Mixing In The Ladle, Correlation For Mixing Time.