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Particulate fouling on structured surfaces is mostly quantified with the integral thermal or mass based fouling resistance. The observed geometries may be structures to improve the heat transfer in heat exchangers (e.g. dimples), cavities in components or more complex geometries. Due to limited accessibility or the requirement of a locally resolved measurement, the existing quantification methods may not be applicable. For this reason, a new method for the quantification for fouling deposits is needed. In this study dimpled surfaces were evaluate by measuring and comparing the integral thermal and mass based fouling resistance with the local fouling resistance inside and around the dimple. This was carried out online with the Phosphorescent Fouling Quantification method developed for this purpose, using phosphorescent particles to quantify the deposited mass. The mass based fouling resistance can be calculated using computer aided image analysis. The measurements for the evaluation are conducted on dimpled surfaces. On these surfaces, a characteristic fouling pattern was observed. A reduced surface coverage and thus lower fouling resistances downstream of the dimple compared to a plain surface could be seen. These results confirm earlier findings, suggesting an advantage of dimpled surfaces against other surface structures with respect to thermo-hydraulic efficiency as well as reduced fouling. Thus, the Phosphorescent Fouling Quantification method provides the possibility to calculate values for local fouling resistances on structured surfaces and thus an optimization of surface structures to minimize fouling propensity.

Development of a quantification method for fouling deposits using phosphorescence