Development of a quantification method for fouling deposits using phosphorescence

Abstract Particulate fouling on structured surfaces is typically quantified using the integral thermal or mass-based resistance. The observed geometries may be structures that can improve heat transfer in exchangers (e.g., dimples), cavities components, more complex geometries. However, due to limited accessibility requirement for a locally resolved measurement, existing quantification methods not applicable surfaces. For this reason, new method needed deposits. In study, dimpled were evaluated by measuring and resistance comparing it with local inside around dimple. This comparison was carried out online Phosphorescent Fouling Quantification developed purpose, phosphorescent particles quantify deposited mass. calculated computer-aided image analysis. measurements evaluation conducted surfaces, which produced characteristic pattern. With reduced surface coverage from up 33.3 % observed, led lower resistances downstream of dimple compared plain surface. These results confirm earlier numerical experimental findings, suggesting an advantage over other respect thermo-hydraulic efficiency as well fouling. Thus, provides possibility calculating values optimizing minimize propensity.