Wall Condensation Modelling in Convective Flow

............................................................................................................... 3 ACKNOWLEDGEMENT ............................................................................................. 4 INDEX OF FIGURES .................................................................................................. 7 1 BACKGROUND ................................................................................................ 11 2 OBJECTIVES AND GOALS ............................................................................. 11 3 METHOD OF ATTACK ..................................................................................... 12 4 PRESENT SITUATION ..................................................................................... 13 4.1 CONDENSATION ............................................................................................. 13 4.2 WALL CONDENSATION .................................................................................... 13 4.3 PRESSURE SUPPRESSION IN NUCLEAR REACTORS ........................................... 14 4.4 ROCKET ENGINE NOZZLES.............................................................................. 14 5 THEORY ........................................................................................................... 16 5.1 CONDENSATION ............................................................................................. 16 5.1.1 Homogeneous condensation ................................................................ 17 5.1.2 Surface condensation ........................................................................... 17 5.1.3 Wall condensation in the presence of a non-condensable gas ............. 18 5.2 APPROXIMATION OF WALL TEMPERATURE WITH WALL CONDENSATION .............. 19 5.3 CONDENSATION MODELS ................................................................................ 20 5.3.1 Wet steam model .................................................................................. 21 5.3.2 Euler-Euler multiphase models with condensation ................................ 22 5.3.3 The wall condensation model ................................................................ 23 5.3.4 The equilibrium phase change model ................................................... 26 5.3.5 The droplet condensation model ........................................................... 26 5.3.6 Condensation models overview ............................................................ 29 5.4 REAL GAS PROPERTIES TABLE ....................................................................... 30