Numerical resolution of conservation equations, mass, momentum and energy. Application to heat and mass transfer phenomenologies of interest for the design of refrigeration units by absorption or adsorption

Abstract

This thesis explores the numerical resolution of mass, momentum, and energy conservation equations, with a focus on their application in absorption and adsorption refrigeration systems. It begins with establishing the fundamentals of computational fluid dynamics, with classic cases examined and validated through custom C++ code. The research then moves to practical case study: falling film heat transfer, a key process in absorption and absorption refrigeration. The simulation of liquid ethylene glycol film flow over a vertical plate is performed using the open foam solver interFoam. The simulation results are validated against both experimental and numerical data, and boundary conditions are optimized for accuracy. Additionally, a new solver, interTempFoam, is introduced to incorporate the temperature transport equation. The heat transfer phenomenon occurring in falling film is analysed and assessed.