Accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater

A clamp-on type flowmeter for steam and air, which does not require pipe-cutting for installation, is needed for diagnosing performance and saving energy in facilities such as factories and power plants. Therefore, in our previous study we devised a heater method for measuring steam and air flow, in...

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Autores principales:	Shuichi UMEZAWA, Katsuhiko SUGITA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	flowmeter heat transfer clamp-on high temperature energy conservation Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/8635d89400244e1cbbfc1189b8e66f7a
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spelling	oai:doaj.org-article:8635d89400244e1cbbfc1189b8e66f7a2021-11-29T05:59:26ZAccuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater2187-974510.1299/mej.20-00077https://doaj.org/article/8635d89400244e1cbbfc1189b8e66f7a2020-05-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/4/7_20-00077/_pdf/-char/enhttps://doaj.org/toc/2187-9745A clamp-on type flowmeter for steam and air, which does not require pipe-cutting for installation, is needed for diagnosing performance and saving energy in facilities such as factories and power plants. Therefore, in our previous study we devised a heater method for measuring steam and air flow, in which a circumferential heater was attached to the outside of a pipe and then the axial temperature distribution on the outside of the pipe was measured by thermocouples. Steam velocity was analyzed on the basis of the temperature distribution in the pipe axial direction, considering heat transfer inside the pipe and thermal conductivity in the steel pipe-wall. Thus, we determined a thermal boundary layer coefficient, which is the ratio of the thermal boundary layer flow rate to the flow rate in the whole pipe cross section, and two kinds of thermal transfer coefficient depending on position, which were that upstream of the heater and that at the middle of the heater. In the present study, we conducted further experiments under various steam pressures, calibrated the reference fluid flowmeter under supervision of the National Institute of Advanced Industrial Science and Technology, and reconsidered the fluid pressure values. Using the experimental data obtained, we could decide the parameters more precisely compared with in the previous study, and thus improved the accuracy of the heater method.Shuichi UMEZAWAKatsuhiko SUGITAThe Japan Society of Mechanical Engineersarticleflowmeterheat transferclamp-onhigh temperatureenergy conservationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 4, Pp 20-00077-20-00077 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	flowmeter heat transfer clamp-on high temperature energy conservation Mechanical engineering and machinery TJ1-1570
spellingShingle	flowmeter heat transfer clamp-on high temperature energy conservation Mechanical engineering and machinery TJ1-1570 Shuichi UMEZAWA Katsuhiko SUGITA Accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater
description	A clamp-on type flowmeter for steam and air, which does not require pipe-cutting for installation, is needed for diagnosing performance and saving energy in facilities such as factories and power plants. Therefore, in our previous study we devised a heater method for measuring steam and air flow, in which a circumferential heater was attached to the outside of a pipe and then the axial temperature distribution on the outside of the pipe was measured by thermocouples. Steam velocity was analyzed on the basis of the temperature distribution in the pipe axial direction, considering heat transfer inside the pipe and thermal conductivity in the steel pipe-wall. Thus, we determined a thermal boundary layer coefficient, which is the ratio of the thermal boundary layer flow rate to the flow rate in the whole pipe cross section, and two kinds of thermal transfer coefficient depending on position, which were that upstream of the heater and that at the middle of the heater. In the present study, we conducted further experiments under various steam pressures, calibrated the reference fluid flowmeter under supervision of the National Institute of Advanced Industrial Science and Technology, and reconsidered the fluid pressure values. Using the experimental data obtained, we could decide the parameters more precisely compared with in the previous study, and thus improved the accuracy of the heater method.
format	article
author	Shuichi UMEZAWA Katsuhiko SUGITA
author_facet	Shuichi UMEZAWA Katsuhiko SUGITA
author_sort	Shuichi UMEZAWA
title	Accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater
title_short	Accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater
title_full	Accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater
title_fullStr	Accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater
title_full_unstemmed	Accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater
title_sort	accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/8635d89400244e1cbbfc1189b8e66f7a
work_keys_str_mv	AT shuichiumezawa accuracyimprovementofaflowmeterforsteamandairtobesetontheoutsideofapipeutilizingacircumferentialheater AT katsuhikosugita accuracyimprovementofaflowmeterforsteamandairtobesetontheoutsideofapipeutilizingacircumferentialheater
_version_	1718407597766213632

Accuracy improvement of a flowmeter for steam and air to be set on the outside of a pipe utilizing a circumferential heater

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