An investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe

Thermal fatigue cracking may initiate at a T-junction pipe where high and low temperature fluids mix. In this study, wall temperature characteristics at a T-junction pipe were investigated to improve the evaluation method for thermal fatigue. The stainless steel test section consisted of a horizonta...

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Autores principales:	Koji MIYOSHI, Akira NAKAMURA, Yoichi UTANOHARA, Nobuyuki TAKENAKA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	thermal fatigue t-junction pipe temperature fluctuation thermocouple thermal stress Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/322ac34299594c5b9066ec4a034c140e
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spelling	oai:doaj.org-article:322ac34299594c5b9066ec4a034c140e2021-11-26T06:12:42ZAn investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe2187-974510.1299/mej.2014tep0050https://doaj.org/article/322ac34299594c5b9066ec4a034c140e2014-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/5/1_2014tep0050/_pdf/-char/enhttps://doaj.org/toc/2187-9745Thermal fatigue cracking may initiate at a T-junction pipe where high and low temperature fluids mix. In this study, wall temperature characteristics at a T-junction pipe were investigated to improve the evaluation method for thermal fatigue. The stainless steel test section consisted of a horizontal main pipe (diameter, 150 mm) and a T-junction connected to a vertical branch pipe (diameter, 50 mm). The inlet flow velocities in the main and branch pipes were set to 0.99 m/s and 0.66 m/s respectively to produce a wall jet pattern in which the jet from the branch pipe was bent by the main pipe flow and made to flow along the pipe wall. The temperature difference was 34.1 K. A total of 148 thermocouples were installed to measure the wall temperature on the pipe inner surface in the downstream region. The maximum of temperature fluctuation intensity on the pipe inner surface was measured as 5% of the fluid temperature difference at the inlets. The dominant frequency of the large temperature fluctuations in the region downstream from z = 0.5Dm was equal to 0.2 of the Strouhal number, which was equal to the frequency caused by the vortex streets generated around the jet flow. The large temperature fluctuation was also observed with the period of about 10 s. The fluctuation was caused by spreading of the heated region in the circumferential direction.Koji MIYOSHIAkira NAKAMURAYoichi UTANOHARANobuyuki TAKENAKAThe Japan Society of Mechanical Engineersarticlethermal fatiguet-junction pipetemperature fluctuationthermocouplethermal stressMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 5, Pp TEP0050-TEP0050 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermal fatigue t-junction pipe temperature fluctuation thermocouple thermal stress Mechanical engineering and machinery TJ1-1570
spellingShingle	thermal fatigue t-junction pipe temperature fluctuation thermocouple thermal stress Mechanical engineering and machinery TJ1-1570 Koji MIYOSHI Akira NAKAMURA Yoichi UTANOHARA Nobuyuki TAKENAKA An investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe
description	Thermal fatigue cracking may initiate at a T-junction pipe where high and low temperature fluids mix. In this study, wall temperature characteristics at a T-junction pipe were investigated to improve the evaluation method for thermal fatigue. The stainless steel test section consisted of a horizontal main pipe (diameter, 150 mm) and a T-junction connected to a vertical branch pipe (diameter, 50 mm). The inlet flow velocities in the main and branch pipes were set to 0.99 m/s and 0.66 m/s respectively to produce a wall jet pattern in which the jet from the branch pipe was bent by the main pipe flow and made to flow along the pipe wall. The temperature difference was 34.1 K. A total of 148 thermocouples were installed to measure the wall temperature on the pipe inner surface in the downstream region. The maximum of temperature fluctuation intensity on the pipe inner surface was measured as 5% of the fluid temperature difference at the inlets. The dominant frequency of the large temperature fluctuations in the region downstream from z = 0.5Dm was equal to 0.2 of the Strouhal number, which was equal to the frequency caused by the vortex streets generated around the jet flow. The large temperature fluctuation was also observed with the period of about 10 s. The fluctuation was caused by spreading of the heated region in the circumferential direction.
format	article
author	Koji MIYOSHI Akira NAKAMURA Yoichi UTANOHARA Nobuyuki TAKENAKA
author_facet	Koji MIYOSHI Akira NAKAMURA Yoichi UTANOHARA Nobuyuki TAKENAKA
author_sort	Koji MIYOSHI
title	An investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe
title_short	An investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe
title_full	An investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe
title_fullStr	An investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe
title_full_unstemmed	An investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe
title_sort	investigation of wall temperature characteristics to evaluate thermal fatigue at a t-junction pipe
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/322ac34299594c5b9066ec4a034c140e
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An investigation of wall temperature characteristics to evaluate thermal fatigue at a T-junction pipe

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