Evaluation of the Effect of Tube Pitch and Surface Alterations on Temperature Field at Sprinkled Tube Bundle

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dc.contributor.authorKracík, Petrcs
dc.contributor.authorCopek, Tomášcs
dc.contributor.authorZachar, Martincs
dc.contributor.authorPospíšil, Jiřícs
dc.coverage.issue2015cs
dc.coverage.volume92cs
dc.date.issued2015-05-06cs
dc.description.abstractWater flowing on a sprinkled tube bundle forms three basic modes: It is the Droplet mode (liquid drips from one tube to another), the Jet mode (with an increasing flow rate droplets merge into a column) and the Membrane (Sheet) mode (with further increasing of falling film liquid flow rate columns merge and create sheets between the tubes. With sufficient flow rate sheets merge at this state and the tube bundle is completely covered by a thin liquid film). There are several factors influencing the individual mode types as well as heat transfer. Beside the above mentioned falling film liquid flow rate they are for instance tube diameters, tube pitches in a tube bundle or a physical condition of a falling film liquid. This paper presents a summary of data measured at atmospheric pressure at a tube bundle consisting of copper tubes of 12 milimeters diameter and of the studied tube length one meter. The tubes are positioned horizontally one above another with the tested pitches of 15, 20, 25 and 30 mm and there is a distribution tube placed above them with water flowing out. The thermal gradient of 15–40 has been tested with all pitches where the falling film liquid's temperature at the inlet of the distribution tube was 15 deg.C. The liquid was heated during the flow through the exchanger and the temperature of the sprinkled (heater) liquid at the inlet of the exchanger with a constant flow rate about 7.2 litres per minute was 40 deg.C. The tested flow of the falling film liquid ranged from 1.0 to 13.0 litres per minute. Sequences of 180 exposures have been recorded in partial flow rate stages by thermographic camera with record frequency of 30 Hz which were consequently assessed using the Matlab programme. This paper presents results achieved at the above mentioned pitches and at three types of tube bundle surfaces.en
dc.description.abstractWater flowing on a sprinkled tube bundle forms three basic modes: It is the Droplet mode (liquid drips from one tube to another), the Jet mode (with an increasing flow rate droplets merge into a column) and the Membrane (Sheet) mode (with further increasing of falling film liquid flow rate columns merge and create sheets between the tubes. With sufficient flow rate sheets merge at this state and the tube bundle is completely covered by a thin liquid film). There are several factors influencing the individual mode types as well as heat transfer. Beside the above mentioned falling film liquid flow rate they are for instance tube diameters, tube pitches in a tube bundle or a physical condition of a falling film liquid. This paper presents a summary of data measured at atmospheric pressure at a tube bundle consisting of copper tubes of 12 milimeters diameter and of the studied tube length one meter. The tubes are positioned horizontally one above another with the tested pitches of 15, 20, 25 and 30 mm and there is a distribution tube placed above them with water flowing out. The thermal gradient of 15–40 has been tested with all pitches where the falling film liquid's temperature at the inlet of the distribution tube was 15 deg.C. The liquid was heated during the flow through the exchanger and the temperature of the sprinkled (heater) liquid at the inlet of the exchanger with a constant flow rate about 7.2 litres per minute was 40 deg.C. The tested flow of the falling film liquid ranged from 1.0 to 13.0 litres per minute. Sequences of 180 exposures have been recorded in partial flow rate stages by thermographic camera with record frequency of 30 Hz which were consequently assessed using the Matlab programme. This paper presents results achieved at the above mentioned pitches and at three types of tube bundle surfaces.en
dc.formattextcs
dc.format.extent1-8cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationEPJ Web of Conferences. 2015, vol. 92, issue 2015, p. 1-8.en
dc.identifier.doi10.1051/epjconf/20159202039cs
dc.identifier.issn2100-014Xcs
dc.identifier.orcid0000-0003-0805-3476cs
dc.identifier.orcid0000-0002-6540-5637cs
dc.identifier.orcid0000-0002-2437-538Xcs
dc.identifier.other110702cs
dc.identifier.researcheridF-7226-2016cs
dc.identifier.researcheridC-1513-2018cs
dc.identifier.researcheridA-5128-2016cs
dc.identifier.scopus55324728200cs
dc.identifier.scopus35568432100cs
dc.identifier.urihttp://hdl.handle.net/11012/196355
dc.language.isoencs
dc.publisherEDP Sciencescs
dc.relation.ispartofEPJ Web of Conferencescs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2100-014X/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjecttemperature fielden
dc.subjectsprinkleden
dc.subjectthermovision measurementsen
dc.subjecttemperature field
dc.subjectsprinkled
dc.subjectthermovision measurements
dc.titleEvaluation of the Effect of Tube Pitch and Surface Alterations on Temperature Field at Sprinkled Tube Bundleen
dc.title.alternativeEvaluation of the Effect of Tube Pitch and Surface Alterations on Temperature Field at Sprinkled Tube Bundleen
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-110702en
sync.item.dbtypeVAVen
sync.item.insts2025.10.14 14:52:35en
sync.item.modts2025.10.14 09:37:48en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. EÚ-odbor energetického inženýrstvícs
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