This domain focuses on developing advanced numerical models and simulation techniques to comprehend the complex fluid dynamics and mass transfer phenomena occurring in multiphase systems, such as gas-liquid, liquid-liquid, and gas-solid interactions. By employing CFD methodologies augmented by population balance modeling, profound insights into the design, optimization, and performance prediction of chemical reactors and unit operations are aimed. This research holds great promise in enhancing unit operation efficiency, reactor design, and reaction kinetics, leading to advancements in diverse industries, including chemical engineering, petrochemicals, and energy production.