Development and experimental verification of momentum, heat and mass transfer model in spray drying

摘要: Abstract A mathematical model of momentum, heat and mass transfer in the atomization zone was proposed. Uneven distribution particles entrainment effects were taken into account model. To verify an extensive experimental investigation performed on water evaporation at different initial air temperatures, feed rates, flow rates drying agent parameters atomization: spray cone angle particle size distribution. Changes temperature inside stream sprayed material, material temperature, rate, changes Sauter diameter diameters vs. their distance from atomizer determined experimentally. Damping screens allowed a flat profile rate tunnel to be obtained. Good agreement between results theoretical data achieved. In paper attempt made apply calculation pilot plant dryer. The supplied dryer tangentially axis characterized by high swirl. theoretically using Computational Fluid Dynamics CFX program. Results obtained this way used our own determine trajectories solve balances for continuous dispersed phases. order consider swirl pattern dryer, balance particle—drying system. verified experimentally basis investigations 20% solution sodium chloride. Additionally, compared with those source cell type system being studied. It found that well described process analyzed also very similar An literature survey drying, including unsteady state phenomena, is presented paper. Main sources errors occurring modelling discussed. critical estimation existing models some them detail.