An experimental study of solids deposited on the base of a heated vessel at low pressure

When a base heat flux was applied the glass particles remained within a bed formed on the base of the evaporator, whereas the CPM particles became suspended in the fluid. In both cases, the temperature in the liquid pool is shown to be reasonably constant and close to the free surface saturation value. The bed of glass particles induced boiling on the surface below it at most conditions, increasing the local base temperature and therefore the local corrosion rate. The base remained in free convection outside of the bed, producing lower base temperatures and therefore a lower corrosion rate. The CPM particles did not form a bed on the base of the evaporator and the temperature of the base remained in free convection at temperatures below, or close to, the local saturation value. However, some base heating was evident near the base centre. The presence of CPM type particles is unlikely to affect the corrosion rate.