Review of coupled heat and mass transfer studies in falling film absorbers: Modeling, experimental and thermodynamic approaches

Thermodynamic analysis in laminar falling film evaporator

“…Afterwards, a significant amount of analytical, numerical and experimental researches on falling film heat, mass and hydrodynamic phenomena has been conducted. Critical reviews of these different phenomena in falling films were carried out by Killion and Garimella [12] and Mahamoudou et al [13]. Although, the experimental study conducted by Karimi and Kawaji [14] on falling film showed a significant difference between their result and the Nusselt's predictions in a wavy turbulent films, the experimental analyses carried out by Ambrosini et al [15] on a water film falling down a flat plate at different inclinations and temperature (between 20-30 • C and 50-70 • C for cold and warm water films respectively) showed that the Nusselt theory represents at low Reynolds numbers the falling film velocity.…”

Mathematical Modeling of the Heat Generated through an Evaporator-Absorber Accompanied by Thermal Storage for the Solar Energy Applications

“…However, with different evaporator geometries, the falling film absorbers and the cylindrical absorber, the mathematical modeling takes the same direction in the analysis of the thermal mechanism. Therefore, after the extraction of the energy balance to identify the energy equations, the use of the finite difference method in its explicit form for the cylindrical absorber and in its implicit form for the falling film absorbers enables estimation of the outlet temperature [37,38]. In addition, because of its high thermal ability compared to the other evaporator geometries, the serpentine geometry is used as a support in photovoltaic systems to improve energy production by adding 2 serpentine thermal absorbers [39].…”