Investigation of deposition and self-cleaning mechanism during particulate fouling on dimpled surfaces

Deponte, Hannes; Rohwer, Lukas; Augustin, Wolfgang; Scholl, Stephan

doi:10.1007/s00231-019-02676-0

Cited by 17 publications

(10 citation statements)

References 27 publications

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“…The particulate deposition can be resolved locally with the mass-based fouling resistance, as well as with the fouling PFQ method (e.g., upstream, and downstream of the dimple) to confirm the statements of previous studies that claim a selfcleaning of dimpled surfaces [8,19]. The results of the massbased fouling resistance and the fouling resistance measured with the PFQ upstream and downstream of the dimple are shown in Fig.…”

Section: Locally Resolved Fouling Resistancesupporting

confidence: 82%

“…Spherical dimples are hypothesized to suppress the deposition of particles from a liquid stream or even to induce a permanent cleaning of the surface. In addition to the numerical studies by Kasper et al [19] and the experimental studies by Deponte et al [8], the self-cleaning effect can be observed in the present study with locally resolved fouling resistances. Furthermore, the PFQ method provides insights into the dimple itself.…”

Section: Evaluation Of the Pfq Methodssupporting

confidence: 74%

“…The experimental setup of the test rig used for the investigations of the fouling behavior of particles in aqueous suspensions on structured surfaces is described in detail by Deponte et al [8]. Figure 4 shows the flow diagram of the particulate fouling plant.…”

Section: Methodsmentioning

confidence: 99%

“…The parameters for the mass-based fouling resistance R f,m are achieved with an invasive method described by Deponte et al [8]. The specific mass m f of the deposited particles is determined by extracting the dried fouling layer from the plate with adhesive tape (A tape with the geometry of 18 mm × 18 mm is used).…”

Section: Mass-based Fouling Resistancementioning

confidence: 99%

“…The self-cleaning effect is numerically and experimentally visualized on the surface downstream of the dimple. The first quantification of the self-cleaning effect of dimples was shown by Deponte et al [8], who measured the decrease in coverage of the surface.…”

Section: Test Platesmentioning

confidence: 99%

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Development of a quantification method for fouling deposits using phosphorescence

2021

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

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Section: Locally Resolved Fouling Resistancesupporting

confidence: 82%

Section: Evaluation Of the Pfq Methodssupporting

confidence: 74%

Section: Methodsmentioning

confidence: 99%

Section: Mass-based Fouling Resistancementioning

confidence: 99%

Section: Test Platesmentioning

confidence: 99%

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Development of a quantification method for fouling deposits using phosphorescence

2021

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Comprehensive Parameter Screening for the Investigation of Particulate Fouling in Pipe Fittings

Jarmatz

Augustin

Scholl

2023

Chemie Ingenieur Technik

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A prominent example of unwanted accumulation in production plants is particulate fouling, which has been subject of many studies in apparatuses. However, pipe fittings have attracted little attention despite their large number in production plants. Here, the influence of process parameters and geometry factors on the fouling in pipe fittings is investigated under isothermal conditions that aims to an improved understanding of their fouling behavior. The variation of fitting type and size, the run time and particle mass fraction have the greatest impact on the fouling mass while the temperature does not influence the result.

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A Comprehensive Review on Fouling of Heat Transfer Units in Sugar Factory Ethanol Plant: Mechanisms and Mitigation Methods

Abo,

Hailegiorgis,

Gindaba

et al. 2024

Environmental Quality Mgmt

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Fouling in heat transfer units has a negative economic impact. Many scale‐forming impurities are present in cane molasses generated by sugar cane production technology, including cations of aluminum (Al), calcium (Ca), iron (Fe), magnesium (Mg), potassium (K), sodium (Na), as well as anions of carbonates, sulfites, phosphates, sulfate, silicates, and chlorides. Ca cations, in particular, form insoluble complexes with many other chemical constituents, making them a scale‐forming impurity. The accumulation of Ca ion on the heat exchanger's surface could increase heat transfer resistance and reduce its overall efficiency. This article reviews many types of heat‐transmitting unit fouling and their successive fouling occurrences. Identifying the chemicals found in scale deposits helps to determine which cleaning products will effectively clean heat transfer units and which scale inhibitors will drastically lower scale formation rates. Furthermore, numerous unit operations and unit processes, such as molasses pre‐treatment and pre‐fermentation practice (inoculation of yeast), followed by fermentation practice, and product purification practice distillation, are used to limit deposit formation and boost ethanol production efficiency. Molasses pre‐treatment and treatment such as chemical treatment, heat treatment, acid centrifugation, and mechanical treatment are critical in decreasing scale development during heat exchange operations.

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Investigation of deposition and self-cleaning mechanism during particulate fouling on dimpled surfaces

Cited by 17 publications

References 27 publications

Development of a quantification method for fouling deposits using phosphorescence

Development of a quantification method for fouling deposits using phosphorescence

Comprehensive Parameter Screening for the Investigation of Particulate Fouling in Pipe Fittings

A Comprehensive Review on Fouling of Heat Transfer Units in Sugar Factory Ethanol Plant: Mechanisms and Mitigation Methods

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