Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography

The aim of the present study is to demonstrate the quantitative measurement of the spatio-temporal fluctuation of the heat transfer in a water pipe flow around an orifice plate. In the present study, a technique using high-speed infrared thermography was used to measure the heat transfer. The measur...

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Autores principales:	Naoki SHIIBARA, Hajime NAKAMURA, Shunsuke YAMADA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2015
Materias:	turbulent flow unsteady flow pipe flow forced convection heat transfer separation reattachment spatio-temporal measurement infrared thermography Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/dd434942596c4c58a37f0f286a79c64f
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spelling	oai:doaj.org-article:dd434942596c4c58a37f0f286a79c64f2021-11-26T06:32:14ZQuantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography2187-974510.1299/mej.15-00312https://doaj.org/article/dd434942596c4c58a37f0f286a79c64f2015-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/6/2_15-00312/_pdf/-char/enhttps://doaj.org/toc/2187-9745The aim of the present study is to demonstrate the quantitative measurement of the spatio-temporal fluctuation of the heat transfer in a water pipe flow around an orifice plate. In the present study, a technique using high-speed infrared thermography was used to measure the heat transfer. The measurement was first performed for a fully developed pipe flow without installing an orifice plate in order to verify the validity of the measurement technique. The spatio-temporal distribution of the heat transfer coefficient was evaluated based on the temperature fluctuation of a heated thin-foil measured using high-speed infrared thermography, and the results indicated that quantitative measurement was possible not only for time-averaged values, but also for fluctuating values. The technique was then used to measure the heat transfer to the flow around an orifice plate (the bore ratio was approximately 0.5). As a result, it was revealed that the heat transfer downstream of the orifice fluctuated violently, and the instantaneous structure of the heat transfer was remarkably finer than the streaky structure for the fully developed pipe flow. The time-averaged value of the heat transfer had a maximum at approximately two diameters downstream of the orifice, where the rms value of the fluctuation and its characteristic frequency also became much higher than those for the fully developed pipe flow.Naoki SHIIBARAHajime NAKAMURAShunsuke YAMADAThe Japan Society of Mechanical Engineersarticleturbulent flowunsteady flowpipe flowforced convectionheat transferseparationreattachmentspatio-temporal measurementinfrared thermographyMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 6, Pp 15-00312-15-00312 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	turbulent flow unsteady flow pipe flow forced convection heat transfer separation reattachment spatio-temporal measurement infrared thermography Mechanical engineering and machinery TJ1-1570
spellingShingle	turbulent flow unsteady flow pipe flow forced convection heat transfer separation reattachment spatio-temporal measurement infrared thermography Mechanical engineering and machinery TJ1-1570 Naoki SHIIBARA Hajime NAKAMURA Shunsuke YAMADA Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography
description	The aim of the present study is to demonstrate the quantitative measurement of the spatio-temporal fluctuation of the heat transfer in a water pipe flow around an orifice plate. In the present study, a technique using high-speed infrared thermography was used to measure the heat transfer. The measurement was first performed for a fully developed pipe flow without installing an orifice plate in order to verify the validity of the measurement technique. The spatio-temporal distribution of the heat transfer coefficient was evaluated based on the temperature fluctuation of a heated thin-foil measured using high-speed infrared thermography, and the results indicated that quantitative measurement was possible not only for time-averaged values, but also for fluctuating values. The technique was then used to measure the heat transfer to the flow around an orifice plate (the bore ratio was approximately 0.5). As a result, it was revealed that the heat transfer downstream of the orifice fluctuated violently, and the instantaneous structure of the heat transfer was remarkably finer than the streaky structure for the fully developed pipe flow. The time-averaged value of the heat transfer had a maximum at approximately two diameters downstream of the orifice, where the rms value of the fluctuation and its characteristic frequency also became much higher than those for the fully developed pipe flow.
format	article
author	Naoki SHIIBARA Hajime NAKAMURA Shunsuke YAMADA
author_facet	Naoki SHIIBARA Hajime NAKAMURA Shunsuke YAMADA
author_sort	Naoki SHIIBARA
title	Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography
title_short	Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography
title_full	Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography
title_fullStr	Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography
title_full_unstemmed	Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography
title_sort	quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography
publisher	The Japan Society of Mechanical Engineers
publishDate	2015
url	https://doaj.org/article/dd434942596c4c58a37f0f286a79c64f
work_keys_str_mv	AT naokishiibara quantitativemeasurementofheattransferfluctuationinapipeflowaroundanorificeplateusinghighspeedinfraredthermography AT hajimenakamura quantitativemeasurementofheattransferfluctuationinapipeflowaroundanorificeplateusinghighspeedinfraredthermography AT shunsukeyamada quantitativemeasurementofheattransferfluctuationinapipeflowaroundanorificeplateusinghighspeedinfraredthermography
_version_	1718409812683784192

Quantitative measurement of heat transfer fluctuation in a pipe flow around an orifice plate using high-speed infrared thermography

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