Influences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling

Cooling in liquid nitrogen is a typical service condition of high-temperature superconducting wire, and the variation of boiling stages on the wire protective layers such as the brass layers could be crucial for the quench behavior of superconducting devices. In this study, the influence of brass su...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Zhiwei Li, Dingwen Yu, Jie Cui, Pingfa Feng, Feng Feng
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Leidenfrost effect liquid nitrogen surface morphology roughness fractal dimension Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/b1108d9342a845129e2ea97d054a3bed
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:b1108d9342a845129e2ea97d054a3bed
record_format	dspace
spelling	oai:doaj.org-article:b1108d9342a845129e2ea97d054a3bed2021-11-11T15:20:53ZInfluences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling10.3390/app1121103232076-3417https://doaj.org/article/b1108d9342a845129e2ea97d054a3bed2021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10323https://doaj.org/toc/2076-3417Cooling in liquid nitrogen is a typical service condition of high-temperature superconducting wire, and the variation of boiling stages on the wire protective layers such as the brass layers could be crucial for the quench behavior of superconducting devices. In this study, the influence of brass surface morphology (parameters of surface roughness and fractal dimension) on the Leidenfrost effect (including the wall superheat at critical heat flux and the wall superheat at Leidenfrost point, which are respectively characterized by the temperatures of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>CHF</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>LP</mi></msub></mrow></semantics></math></inline-formula>) was studied. The surfaces of brass samples were polished by sandpaper to obtain different morphologies, which were characterized by using white light interferometer images, and the boiling curves were recorded and analyzed by Matlab with lumped parameter method. The experimental results demonstrated that the surface morphology of brass samples could influence the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>LP</mi></msub></mrow></semantics></math></inline-formula> significantly, but had no clear relationship with the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>CHF</mi></msub></mrow></semantics></math></inline-formula>. Moreover, the multi-scaled analysis was carried out to explore the influencing mechanism of surface microstructure, the relationship between <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>LP</mi></msub></mrow></semantics></math></inline-formula> and scale was more clear when the scale was small, and the fractal dimension was calculated and discussed together with surface roughness. The findings of this study could be instructive for surface treatment of superconducting wires to suppress quench propagation.Zhiwei LiDingwen YuJie CuiPingfa FengFeng FengMDPI AGarticleLeidenfrost effectliquid nitrogensurface morphologyroughnessfractal dimensionTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10323, p 10323 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Leidenfrost effect liquid nitrogen surface morphology roughness fractal dimension Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	Leidenfrost effect liquid nitrogen surface morphology roughness fractal dimension Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Zhiwei Li Dingwen Yu Jie Cui Pingfa Feng Feng Feng Influences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling
description	Cooling in liquid nitrogen is a typical service condition of high-temperature superconducting wire, and the variation of boiling stages on the wire protective layers such as the brass layers could be crucial for the quench behavior of superconducting devices. In this study, the influence of brass surface morphology (parameters of surface roughness and fractal dimension) on the Leidenfrost effect (including the wall superheat at critical heat flux and the wall superheat at Leidenfrost point, which are respectively characterized by the temperatures of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>CHF</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>LP</mi></msub></mrow></semantics></math></inline-formula>) was studied. The surfaces of brass samples were polished by sandpaper to obtain different morphologies, which were characterized by using white light interferometer images, and the boiling curves were recorded and analyzed by Matlab with lumped parameter method. The experimental results demonstrated that the surface morphology of brass samples could influence the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>LP</mi></msub></mrow></semantics></math></inline-formula> significantly, but had no clear relationship with the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>CHF</mi></msub></mrow></semantics></math></inline-formula>. Moreover, the multi-scaled analysis was carried out to explore the influencing mechanism of surface microstructure, the relationship between <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><msub><mi>T</mi><mi>LP</mi></msub></mrow></semantics></math></inline-formula> and scale was more clear when the scale was small, and the fractal dimension was calculated and discussed together with surface roughness. The findings of this study could be instructive for surface treatment of superconducting wires to suppress quench propagation.
format	article
author	Zhiwei Li Dingwen Yu Jie Cui Pingfa Feng Feng Feng
author_facet	Zhiwei Li Dingwen Yu Jie Cui Pingfa Feng Feng Feng
author_sort	Zhiwei Li
title	Influences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling
title_short	Influences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling
title_full	Influences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling
title_fullStr	Influences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling
title_full_unstemmed	Influences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling
title_sort	influences of brass surface morphology on leidenfrost effect during liquid nitrogen cooling
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b1108d9342a845129e2ea97d054a3bed
work_keys_str_mv	AT zhiweili influencesofbrasssurfacemorphologyonleidenfrosteffectduringliquidnitrogencooling AT dingwenyu influencesofbrasssurfacemorphologyonleidenfrosteffectduringliquidnitrogencooling AT jiecui influencesofbrasssurfacemorphologyonleidenfrosteffectduringliquidnitrogencooling AT pingfafeng influencesofbrasssurfacemorphologyonleidenfrosteffectduringliquidnitrogencooling AT fengfeng influencesofbrasssurfacemorphologyonleidenfrosteffectduringliquidnitrogencooling
_version_	1718435385978126336

Influences of Brass Surface Morphology on Leidenfrost Effect during Liquid Nitrogen Cooling

Ejemplares similares