Crystallization Fouling in Experimental Micro Heat Exchangers—Optical and Thermal Investigations

Mayer, M.; Bucko, J.; Benzinger, W.; Dittmeyer, Roland; Augustin, Wolfgang; Scholl, Stephan

doi:10.1080/08916152.2012.719066

Cited by 18 publications

(8 citation statements)

References 13 publications

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“…The results confirm the findings in [16] that cleaning in place of micro heat exchangers is possible and that the investment of acid-resistant surfaces could be beneficial if this type of cleaning is required. Note that it was observed that cleaning in place (CIP) was enhanced through the bypass flow below the fins between the micro-channels, which can be attributed to the clamped construction of the experimental micro heat exchanger.…”

Section: Cleaning Progresssupporting

confidence: 92%

“…(16)); k 1 , k 2 , and k 3 are coefficients determined from fitting Eq. (16) to the different cleaning curves:…”

Section: Cleaning Progressmentioning

confidence: 99%

“…There are several advantages micro heat exchangers do offer: directed heat transfer and product protection through small residence times [11], high mass transfer rates [12] in the case of additional chemical reactions, portability through a simple modular design [13], and facilitation of heat transfer in situations where little space is available, such as computer servers and aviation systems. Despite this, the process conditions are quite different; due to the small dimensions, surface roughness can have a stronger impact on the heat transfer [12,14], residence times are very small [15,16], and flow regimes are most often laminar even at high flow velocity. Furthermore, heat transfer coefficients can be very high (a $ 10,000 W m 22 K 21 ) [17].…”

Section: Micro Heat Exchangersmentioning

confidence: 99%

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Modeling Fouling Factors for Microscale Heat Exchangers

Mayer

Bucko

Benzinger

et al. 2014

Experimental Heat Transfer

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This article presents an approach to the modeling of CaCO 3 fouling and cleaning in a microscale cross-flow heat exchanger. The fouling progress was detected by thermal, fluid dynamical, and optical measures. In general, the observed fouling phenomena at microscale were comparable to those at macroscale. The detected thermal fouling resistance was between 10 26 and 10 23 m 22 K 21 . As expected, crystallization fouling strongly depends on the surface temperature. In addition, the surface coverage can be a useful measure for both processes-fouling and cleaning. An extended approach to derive a reasonable fouling allowance was formulated through a fractional fouling resistance.

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Section: Cleaning Progresssupporting

confidence: 92%

“…(16)); k 1 , k 2 , and k 3 are coefficients determined from fitting Eq. (16) to the different cleaning curves:…”

Section: Cleaning Progressmentioning

confidence: 99%

Section: Micro Heat Exchangersmentioning

confidence: 99%

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Modeling Fouling Factors for Microscale Heat Exchangers

Mayer

Bucko

Benzinger

et al. 2014

Experimental Heat Transfer

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“…Again, removal of crystals was not observed. In later experiments, Mayer et al 24 observed via optical investigation an uneven distribution of the deposits in the parallel channel arrangement which had developed during the experiment. This was due to an inhomogeneous distribution of the heat flux and to a fouling-induced maldistribution of the fluid flow in the parallel channels.…”

Section: Crystallization Foulingmentioning

confidence: 94%

Fouling in microstructured devices: a review

et al. 2015

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Microstructured devices are widely used for manufacturing products that benefit from process intensification, with pharmaceutical products or specialties of the chemical industry being prime examples. These devices are ideally used for processing pure fluids. Where particulate or non-pure flows are involved, processes are treated with utmost caution since related fouling and blocking issues present the greatest barrier to operating microstructured devices effectively. Micro process engineering is a relatively new research field and there is limited understanding of fouling in these dimensions and its underlying processes and phenomena. A comprehensive review on fouling in microstructured devices would be helpful in this regard, but is currently lacking. This paper attempts to review recent developments of fouling in micro dimensions for all fouling categories (crystallization, particulate, chemical reaction, corrosion and biological growth fouling) and the sequential events involved (initiation, transport, attachment, removal and aging). Compared to fouling in macro dimensions, an additional sixth category is suggested: clogging by gas bubbles. Most of the reviewed papers present very specific fouling investigations making it difficult to derive general rules and parameter dependencies, and comparative or critical considerations of the studies were difficult. We therefore used a statistical approach to evaluate the research in the field of fouling in microchannels.

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“…Therefore, new strategies for early fouling detection, as well as methods for fouling mitigation, suitable for microcomponents, are required. Nevertheless, microstructured devices have proven beneficial in academic and industrial applications .…”

Section: Introductionmentioning

confidence: 99%

Fouling Detection in an Optically Accessible Microstructured Heat Exchanger

et al. 2019

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The application of highly effective microstructured devices in continuous production and industrial environments is frequently prone to fouling. A new method is presented to characterize fouling in these microstructures. Thermal fouling of aqueous solutions containing whey protein were used as a test system. Different fouling effects could be observed and distinguished. Integral fouling indicators, such as thermal fouling resistance and pressure drop, as conventional criteria for the occurrence of fouling were compared with direct local optical observation. Low thermal fouling resistances could be detected.

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Crystallization Fouling in Experimental Micro Heat Exchangers—Optical and Thermal Investigations

Cited by 18 publications

References 13 publications

Modeling Fouling Factors for Microscale Heat Exchangers

Modeling Fouling Factors for Microscale Heat Exchangers

Fouling in microstructured devices: a review

Fouling Detection in an Optically Accessible Microstructured Heat Exchanger

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