Evaluation of a Cleaning Procedure for Micro-Structured Devices by Optical Inspection.
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| Title: | Evaluation of a Cleaning Procedure for Micro-Structured Devices by Optical Inspection. |
|---|---|
| Authors: | Schoenitz, M.1 (AUTHOR) m.schoenitz@tu-braunschweig.de, Warmeling, N.1 (AUTHOR), Augustin, W.1 (AUTHOR), Scholl, S.1 (AUTHOR) |
| Source: | Experimental Heat Transfer. Jul2014, Vol. 27 Issue 4, p376-388. 13p. |
| Subjects: | Microstructure, Optical quality control, Fouling, Measurement of pressure drop (Fluid dynamics), MatLab (Computer software), Heat exchangers |
| Abstract: | Fouling and cleaning evaluations are commonly performed integrally, for instance, via pressure drop measurements of selected devices. For micro-structured devices, local fouling and cleaning behavior is of great interest due to the reduced dimensions and characteristic lengths of some hundred micrometers, which can lead to totally blocked microchannels. In this work, a method for local visual cleaning evaluations in microchannels was investigated. It is based on a visually accessible micro heat exchanger with a digital microscope that can be moved to different observation points within one experiment. Captured images are converted via a MATLAB®(The MathWorks, Natick, Massachusetts, USA) algorithm into black-and-white images containing only one descriptor for each pixel: soiled (black) or clean (white). The soil coverage is then calculated through the ratio of black pixels to the number of all pixels in the regarded images. It is shown that the method is suitable for on-line monitoring of cleaning progress in microchannels. Different developments in the calculated soil coverage are discussed. Decreasing soil coverage is found for successful cleaning methods; increasing soil coverage is found for blocked sections, which act like a filter for upstream detached particles or agglomerates; and constant soil coverage is found for sections with no change in soiled surface area. Gas bubble growth at attached particles for nucleation are found in sudden and short increases of the soil coverage. [ABSTRACT FROM PUBLISHER] |
| Copyright of Experimental Heat Transfer is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 95284669 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Evaluation of a Cleaning Procedure for Micro-Structured Devices by Optical Inspection. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Schoenitz%2C+M%2E%22">Schoenitz, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> m.schoenitz@tu-braunschweig.de</i><br /><searchLink fieldCode="AR" term="%22Warmeling%2C+N%2E%22">Warmeling, N.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Augustin%2C+W%2E%22">Augustin, W.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Scholl%2C+S%2E%22">Scholl, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Experimental+Heat+Transfer%22">Experimental Heat Transfer</searchLink>. Jul2014, Vol. 27 Issue 4, p376-388. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+quality+control%22">Optical quality control</searchLink><br /><searchLink fieldCode="DE" term="%22Fouling%22">Fouling</searchLink><br /><searchLink fieldCode="DE" term="%22Measurement+of+pressure+drop+%28Fluid+dynamics%29%22">Measurement of pressure drop (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22MatLab+%28Computer+software%29%22">MatLab (Computer software)</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+exchangers%22">Heat exchangers</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Fouling and cleaning evaluations are commonly performed integrally, for instance, via pressure drop measurements of selected devices. For micro-structured devices, local fouling and cleaning behavior is of great interest due to the reduced dimensions and characteristic lengths of some hundred micrometers, which can lead to totally blocked microchannels. In this work, a method for local visual cleaning evaluations in microchannels was investigated. It is based on a visually accessible micro heat exchanger with a digital microscope that can be moved to different observation points within one experiment. Captured images are converted via a MATLAB®(The MathWorks, Natick, Massachusetts, USA) algorithm into black-and-white images containing only one descriptor for each pixel: soiled (black) or clean (white). The soil coverage is then calculated through the ratio of black pixels to the number of all pixels in the regarded images. It is shown that the method is suitable for on-line monitoring of cleaning progress in microchannels. Different developments in the calculated soil coverage are discussed. Decreasing soil coverage is found for successful cleaning methods; increasing soil coverage is found for blocked sections, which act like a filter for upstream detached particles or agglomerates; and constant soil coverage is found for sections with no change in soiled surface area. Gas bubble growth at attached particles for nucleation are found in sudden and short increases of the soil coverage. [ABSTRACT FROM PUBLISHER] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Experimental Heat Transfer is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/08916152.2013.849463 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 376 Subjects: – SubjectFull: Microstructure Type: general – SubjectFull: Optical quality control Type: general – SubjectFull: Fouling Type: general – SubjectFull: Measurement of pressure drop (Fluid dynamics) Type: general – SubjectFull: MatLab (Computer software) Type: general – SubjectFull: Heat exchangers Type: general Titles: – TitleFull: Evaluation of a Cleaning Procedure for Micro-Structured Devices by Optical Inspection. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Schoenitz, M. – PersonEntity: Name: NameFull: Warmeling, N. – PersonEntity: Name: NameFull: Augustin, W. – PersonEntity: Name: NameFull: Scholl, S. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2014 Type: published Y: 2014 Identifiers: – Type: issn-print Value: 08916152 Numbering: – Type: volume Value: 27 – Type: issue Value: 4 Titles: – TitleFull: Experimental Heat Transfer Type: main |
| ResultId | 1 |
