Belagwachstum am umströmten Rohr

Abstract

AbstractGrowth of Deposits on Pipes in a Field of Flow. The deposition of ash particles on the heat pipes of steam generators represents an energy and safety problem. A deterministic single‐particle model was used to simulate this deposit formation. The numeric solution of the equation of motion gives the distribution of the impact points of the particles on the pipe surface. A particle mass balance allows calculation of the deposit formation δ (φ, t) on a pipe in space and time. Even if only a simple adhesion model is used, the calculated shape of the deposit can approach real deposit shapes. The effect of the sticking probability on deposit shape and formation time is shown. Numeric and analytical studies indicate the existence of stable limiting forms of the deposit. Thus, pipe forms can be calculated which allow only low levels of deposition and erosion. The model can be applied to particle‐fluid flows around other contours.