Thermal and hydrodynamic analysis of the condensation and evaporation processes in horizontal tube desalination plant

摘要: This paper considers the hydrodynamic and thermal analysis for case where steam is condensing inside a horizontal tube while simultaneously thin water film evaporating on outside of tube. An collective three-dimensional effects influencing sides are presented at different operating conditions. The conditions include brine mass feed rate, saturation temperatures falling brine, vapour flow rates. extended to account further produced by pressure shear stresses, also temperature differences between both model in this work consists three regions condensation side two evaporation side. categorized laminar layer (at top tube), stratified laminary bottom or turbulent zone. has thermally developing liquid fully developed results condensation/evaporation show that dominant due mainly rates, secondly differences, least incoming Calculations carried out Reynolds number 20 000 30 000, inlet 60 70°C, rate 0.01 0.15 kg m -1 s -1. hydrodynamics 70 °C,