Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux

This study was conducted to investigate the transient heat transfer characteristics of a twisted structure. The twisted structure was heated according to exponential function (Q=Q0×exp(t/τ), where Q0 is the initial heat generation rate, W/m3; t is time, s; and τ is the period of heat generation rate...

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Autor principal:	Li Wang
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	exponential heat flux twisted plate transient heat transfer forced convection heat transfer enhancement General Works A
Acceso en línea:	https://doaj.org/article/48b25bfd70ca4b9eb262c64106990dc2
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id	oai:doaj.org-article:48b25bfd70ca4b9eb262c64106990dc2
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spelling	oai:doaj.org-article:48b25bfd70ca4b9eb262c64106990dc22021-11-15T06:42:04ZTransient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux2296-598X10.3389/fenrg.2021.771900https://doaj.org/article/48b25bfd70ca4b9eb262c64106990dc22021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fenrg.2021.771900/fullhttps://doaj.org/toc/2296-598XThis study was conducted to investigate the transient heat transfer characteristics of a twisted structure. The twisted structure was heated according to exponential function (Q=Q0×exp(t/τ), where Q0 is the initial heat generation rate, W/m3; t is time, s; and τ is the period of heat generation rate). A wide range of τ from 37 ms to 14 s was applied for the experimental study. A platinum plate with five pitches (each was 180° twisted with 20 mm in length) was used in the experiment. Helium gas with inlet temperature of 298 K under 500 kPa was used as the coolant. The heat transfer coefficient is found to increase with the decrease of τ, and the transition point was estimated to be at τ≈1s, which means that, when the increasing ratio of heat generation rate satisfies dQdt≥Q0⋅et, the heat transfer enhancement phenomenon will be observed. The response analysis for transient heat transfer at fluid-solid interface was conducted by applying the concept of penetration depth. It is considered that, when the penetration depth is smaller than the thermal boundary thickness, the heat transfer from the interface (wall surface) to the fluid domain is not fully developed during the disturbance.Li WangFrontiers Media S.A.articleexponential heat fluxtwisted platetransient heat transferforced convectionheat transfer enhancementGeneral WorksAENFrontiers in Energy Research, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	exponential heat flux twisted plate transient heat transfer forced convection heat transfer enhancement General Works A
spellingShingle	exponential heat flux twisted plate transient heat transfer forced convection heat transfer enhancement General Works A Li Wang Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux
description	This study was conducted to investigate the transient heat transfer characteristics of a twisted structure. The twisted structure was heated according to exponential function (Q=Q0×exp(t/τ), where Q0 is the initial heat generation rate, W/m3; t is time, s; and τ is the period of heat generation rate). A wide range of τ from 37 ms to 14 s was applied for the experimental study. A platinum plate with five pitches (each was 180° twisted with 20 mm in length) was used in the experiment. Helium gas with inlet temperature of 298 K under 500 kPa was used as the coolant. The heat transfer coefficient is found to increase with the decrease of τ, and the transition point was estimated to be at τ≈1s, which means that, when the increasing ratio of heat generation rate satisfies dQdt≥Q0⋅et, the heat transfer enhancement phenomenon will be observed. The response analysis for transient heat transfer at fluid-solid interface was conducted by applying the concept of penetration depth. It is considered that, when the penetration depth is smaller than the thermal boundary thickness, the heat transfer from the interface (wall surface) to the fluid domain is not fully developed during the disturbance.
format	article
author	Li Wang
author_facet	Li Wang
author_sort	Li Wang
title	Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux
title_short	Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux
title_full	Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux
title_fullStr	Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux
title_full_unstemmed	Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux
title_sort	transient heat transfer characteristics of twisted structure heated by exponential heat flux
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/48b25bfd70ca4b9eb262c64106990dc2
work_keys_str_mv	AT liwang transientheattransfercharacteristicsoftwistedstructureheatedbyexponentialheatflux
_version_	1718428549896994816

Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux

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