A New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit

Abstract Nearly a century of research on enhancing critical heat flux (CHF) has focused on altering the boiling surface properties such as its nucleation site density, wettability, wickability and heat transfer area. But, a mechanism to manipulate dynamics of the vapor and liquid interactions above...

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Autores principales:	Abdolreza Fazeli, Saeed Moghaddam
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ec7eee32f238442881966515349b1051
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spelling	oai:doaj.org-article:ec7eee32f238442881966515349b10512021-12-02T12:32:25ZA New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit10.1038/s41598-017-05036-22045-2322https://doaj.org/article/ec7eee32f238442881966515349b10512017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05036-2https://doaj.org/toc/2045-2322Abstract Nearly a century of research on enhancing critical heat flux (CHF) has focused on altering the boiling surface properties such as its nucleation site density, wettability, wickability and heat transfer area. But, a mechanism to manipulate dynamics of the vapor and liquid interactions above the boiling surface as a means of enhancing CHF has not been proposed. Here, a new approach is implemented to limit the vapor phase lateral expansion over the heat transfer surface and actively control the surface wetted area fraction, known to decline monotonically with increasing heat flux. This new degree of freedom has enabled reaching unprecedented CHF levels and revealed new details about the physics of CHF. The impact of wickability, effective heat transfer area, and liquid pressure on CHF is precisely quantified. Test results show that, when rewetting is facilitated, the CHF increases linearly with the effective surface heat transfer area. A maximum CHF of 1.8 kW/cm2 was achieved on a copper structure with the highest surface area among all tested surfaces. A model developed based on the experimental data suggests that the thermal conductivity of the surface structures ultimately limits the CHF; and a maximum CHF of 7–8 kW/cm2 may be achieved using diamond surface structures.Abdolreza FazeliSaeed MoghaddamNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Abdolreza Fazeli Saeed Moghaddam A New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit
description	Abstract Nearly a century of research on enhancing critical heat flux (CHF) has focused on altering the boiling surface properties such as its nucleation site density, wettability, wickability and heat transfer area. But, a mechanism to manipulate dynamics of the vapor and liquid interactions above the boiling surface as a means of enhancing CHF has not been proposed. Here, a new approach is implemented to limit the vapor phase lateral expansion over the heat transfer surface and actively control the surface wetted area fraction, known to decline monotonically with increasing heat flux. This new degree of freedom has enabled reaching unprecedented CHF levels and revealed new details about the physics of CHF. The impact of wickability, effective heat transfer area, and liquid pressure on CHF is precisely quantified. Test results show that, when rewetting is facilitated, the CHF increases linearly with the effective surface heat transfer area. A maximum CHF of 1.8 kW/cm2 was achieved on a copper structure with the highest surface area among all tested surfaces. A model developed based on the experimental data suggests that the thermal conductivity of the surface structures ultimately limits the CHF; and a maximum CHF of 7–8 kW/cm2 may be achieved using diamond surface structures.
format	article
author	Abdolreza Fazeli Saeed Moghaddam
author_facet	Abdolreza Fazeli Saeed Moghaddam
author_sort	Abdolreza Fazeli
title	A New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit
title_short	A New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit
title_full	A New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit
title_fullStr	A New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit
title_full_unstemmed	A New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit
title_sort	new paradigm for understanding and enhancing the critical heat flux (chf) limit
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ec7eee32f238442881966515349b1051
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A New Paradigm for Understanding and Enhancing the Critical Heat Flux (CHF) Limit

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