Numerical modeling of falling film absorption outside vertical tubes with ammonia-water in presence of magnetic field
Magnetic field was applied in the absorption process of ammonia-water absorption refrigeration.The numerical model of falling film absorption outside vertical tube with ammonia-water in the presence of magnetic field was established.The macroscopic magnetic force was added in the equation of momentum.In the process of modeling,the variation of falling film thickness,variation of physical characteristics of ammonia-water and convection in the direction of film thickness were considered.The distributions of temperature,concentration and velocity of falling film were obtained within 0—3 T of magnetic induction intensity by numerical simulation.The results showed that the absorption heat,absorption mass,mass transfer coefficient increased with the increase of magnetic induction intensity.The falling film absorption with ammonia-water could be intensified to some degree by external magnetic field.