Recognition of two-phase flow pattern inside evaporator tubes

The convective heat exchange mechanism in two-phase regime, can allow high exchange coefficients, as long as particular conditions are respected, in terms of vapor quality. In evaporator tubes this problem is particularly important as a deviation from the optimal flow conditions can drastically drop...

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Autores principales:	Amoresano Amedeo, Iodice Paolo, Langella Giuseppe, Niola Vincenzo, Quaremba Giuseppe
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/a6a1e30b8e5042f88f8443fe3af81f5f
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spelling	oai:doaj.org-article:a6a1e30b8e5042f88f8443fe3af81f5f2021-11-08T15:18:51ZRecognition of two-phase flow pattern inside evaporator tubes2267-124210.1051/e3sconf/202131204003https://doaj.org/article/a6a1e30b8e5042f88f8443fe3af81f5f2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/88/e3sconf_ati2021_04003.pdfhttps://doaj.org/toc/2267-1242The convective heat exchange mechanism in two-phase regime, can allow high exchange coefficients, as long as particular conditions are respected, in terms of vapor quality. In evaporator tubes this problem is particularly important as a deviation from the optimal flow conditions can drastically drop the efficiency of the heat exchange. This work describes an innovative methodology for identifying the different two-phase flow regimes in evaporator pipes, through the processing of the vibrational data acquired on the pipe itself. An experimental apparatus with transparent pipes has been built up to recognize flow patterns by a fast image acquisition camera. Images have been associated to vibration data acquired on pipes by accelerometer. The analysis of frequency spectrum, led to first interesting results thus it is possible to distinguish between “no bubbles” regimes and different “bubbles” regimes. A wide test campaign has been realized on vertical and horizontal pipes, simulating steam bubbles with nitrogen bubbles, reproducing the main flow patterns. The paper demonstrates the possibility to design smart and non-intrusive sensor to be applied on evaporated tubes for the recognizing of anomalous thermal flow condition and sets the stage for future engineering work.Amoresano AmedeoIodice PaoloLangella GiuseppeNiola VincenzoQuaremba GiuseppeEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 312, p 04003 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Amoresano Amedeo Iodice Paolo Langella Giuseppe Niola Vincenzo Quaremba Giuseppe Recognition of two-phase flow pattern inside evaporator tubes
description	The convective heat exchange mechanism in two-phase regime, can allow high exchange coefficients, as long as particular conditions are respected, in terms of vapor quality. In evaporator tubes this problem is particularly important as a deviation from the optimal flow conditions can drastically drop the efficiency of the heat exchange. This work describes an innovative methodology for identifying the different two-phase flow regimes in evaporator pipes, through the processing of the vibrational data acquired on the pipe itself. An experimental apparatus with transparent pipes has been built up to recognize flow patterns by a fast image acquisition camera. Images have been associated to vibration data acquired on pipes by accelerometer. The analysis of frequency spectrum, led to first interesting results thus it is possible to distinguish between “no bubbles” regimes and different “bubbles” regimes. A wide test campaign has been realized on vertical and horizontal pipes, simulating steam bubbles with nitrogen bubbles, reproducing the main flow patterns. The paper demonstrates the possibility to design smart and non-intrusive sensor to be applied on evaporated tubes for the recognizing of anomalous thermal flow condition and sets the stage for future engineering work.
format	article
author	Amoresano Amedeo Iodice Paolo Langella Giuseppe Niola Vincenzo Quaremba Giuseppe
author_facet	Amoresano Amedeo Iodice Paolo Langella Giuseppe Niola Vincenzo Quaremba Giuseppe
author_sort	Amoresano Amedeo
title	Recognition of two-phase flow pattern inside evaporator tubes
title_short	Recognition of two-phase flow pattern inside evaporator tubes
title_full	Recognition of two-phase flow pattern inside evaporator tubes
title_fullStr	Recognition of two-phase flow pattern inside evaporator tubes
title_full_unstemmed	Recognition of two-phase flow pattern inside evaporator tubes
title_sort	recognition of two-phase flow pattern inside evaporator tubes
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/a6a1e30b8e5042f88f8443fe3af81f5f
work_keys_str_mv	AT amoresanoamedeo recognitionoftwophaseflowpatterninsideevaporatortubes AT iodicepaolo recognitionoftwophaseflowpatterninsideevaporatortubes AT langellagiuseppe recognitionoftwophaseflowpatterninsideevaporatortubes AT niolavincenzo recognitionoftwophaseflowpatterninsideevaporatortubes AT quarembagiuseppe recognitionoftwophaseflowpatterninsideevaporatortubes
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Recognition of two-phase flow pattern inside evaporator tubes

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