Role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body

Nanofluid, a liquid containing choroidal dispersion of nanometer-sized solid particles, enables high-temperature bodies to be cooled more rapidly during quenching than in pure liquid. Drastic rise of the minimum heat flux temperature (TMHF) caused by the layer of nanoparticles formed on the heat tra...

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Autores principales:	Yutaro UMEHARA, Tomio OKAWA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	quenching nanofluid nanoparticle layer minimum heat flux temperature contact temperature contact duration surface property Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/a9a12b7a083a4ebf9dd8fe542d2d7463
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spelling	oai:doaj.org-article:a9a12b7a083a4ebf9dd8fe542d2d74632021-11-29T06:09:58ZRole of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body2187-974510.1299/mej.20-00527https://doaj.org/article/a9a12b7a083a4ebf9dd8fe542d2d74632021-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/4/8_20-00527/_pdf/-char/enhttps://doaj.org/toc/2187-9745Nanofluid, a liquid containing choroidal dispersion of nanometer-sized solid particles, enables high-temperature bodies to be cooled more rapidly during quenching than in pure liquid. Drastic rise of the minimum heat flux temperature (TMHF) caused by the layer of nanoparticles formed on the heat transfer surface is the key phenomenon of heat transfer enhancement. In the present work, using alumina, silica, and titanium dioxide as the nanoparticle materials, quenching experiments were carried out to explore the mechanisms of the rise of TMHF in nanofluids; stainless steel 304 and Inconel 718 were used as the materials of the specimen and distilled water was used as the base liquid. In the experiments, TMHF increased in all the nanofluids but the increasing rate was dependent significantly on the nanoparticle material and the nanoparticle layer thickness. To elucidate the mechanisms of the heat transfer enhancement, the relations of TMHF with the three basic surface parameters of roughness, wettability, and wickability were examined but no clear relationship was found. When the metal specimen of higher thermal conductivity is covered with the nanoparticle layer of lower thermal conductivity, the contact temperature during quenching should decrease and the contact duration would be dependent on the thermal properties and thickness of the nanoparticle layer. Assuming that TMHF rises with an increase in the contact duration, a new model describing the rise of TMHF in the nanofluid was proposed.Yutaro UMEHARATomio OKAWAThe Japan Society of Mechanical Engineersarticlequenchingnanofluidnanoparticle layerminimum heat flux temperaturecontact temperaturecontact durationsurface propertyMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 4, Pp 20-00527-20-00527 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	quenching nanofluid nanoparticle layer minimum heat flux temperature contact temperature contact duration surface property Mechanical engineering and machinery TJ1-1570
spellingShingle	quenching nanofluid nanoparticle layer minimum heat flux temperature contact temperature contact duration surface property Mechanical engineering and machinery TJ1-1570 Yutaro UMEHARA Tomio OKAWA Role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body
description	Nanofluid, a liquid containing choroidal dispersion of nanometer-sized solid particles, enables high-temperature bodies to be cooled more rapidly during quenching than in pure liquid. Drastic rise of the minimum heat flux temperature (TMHF) caused by the layer of nanoparticles formed on the heat transfer surface is the key phenomenon of heat transfer enhancement. In the present work, using alumina, silica, and titanium dioxide as the nanoparticle materials, quenching experiments were carried out to explore the mechanisms of the rise of TMHF in nanofluids; stainless steel 304 and Inconel 718 were used as the materials of the specimen and distilled water was used as the base liquid. In the experiments, TMHF increased in all the nanofluids but the increasing rate was dependent significantly on the nanoparticle material and the nanoparticle layer thickness. To elucidate the mechanisms of the heat transfer enhancement, the relations of TMHF with the three basic surface parameters of roughness, wettability, and wickability were examined but no clear relationship was found. When the metal specimen of higher thermal conductivity is covered with the nanoparticle layer of lower thermal conductivity, the contact temperature during quenching should decrease and the contact duration would be dependent on the thermal properties and thickness of the nanoparticle layer. Assuming that TMHF rises with an increase in the contact duration, a new model describing the rise of TMHF in the nanofluid was proposed.
format	article
author	Yutaro UMEHARA Tomio OKAWA
author_facet	Yutaro UMEHARA Tomio OKAWA
author_sort	Yutaro UMEHARA
title	Role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body
title_short	Role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body
title_full	Role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body
title_fullStr	Role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body
title_full_unstemmed	Role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body
title_sort	role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/a9a12b7a083a4ebf9dd8fe542d2d7463
work_keys_str_mv	AT yutaroumehara roleofnanoparticlelayerindeterminingminimumheatfluxtemperatureduringquenchingofhightemperaturebody AT tomiookawa roleofnanoparticlelayerindeterminingminimumheatfluxtemperatureduringquenchingofhightemperaturebody
_version_	1718407604890238976

Role of nanoparticle layer in determining minimum heat flux temperature during quenching of high-temperature body

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