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Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency

Polymers with highly conductive fillers could possibly replace standardly used materials, such as aluminum and copper alloys, for passive cooling purposes. The main problem of the composite polymer-based heat sinks is that their high thermal conductivity is uneven. The orientation of this anisotropy...

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Detalles Bibliográficos
Autores principales: Guzej, Michal, Zachar, Martin, Kominek, Jan, Kotrbacek, Petr, Brachna, Robert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8067716/
https://www.ncbi.nlm.nih.gov/pubmed/33917050
http://dx.doi.org/10.3390/polym13081186
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author Guzej, Michal
Zachar, Martin
Kominek, Jan
Kotrbacek, Petr
Brachna, Robert
author_facet Guzej, Michal
Zachar, Martin
Kominek, Jan
Kotrbacek, Petr
Brachna, Robert
author_sort Guzej, Michal
collection PubMed
description Polymers with highly conductive fillers could possibly replace standardly used materials, such as aluminum and copper alloys, for passive cooling purposes. The main problem of the composite polymer-based heat sinks is that their high thermal conductivity is uneven. The orientation of this anisotropy is set according to the position of the highly thermally conductive filler. Its orientation is influenced by the melt flow during the polymer heat sink molding process. This article shows that change of the melt flow inside the mold cavity can improve the overall cooling efficiency of a polymer heat sink, which leads to lower temperatures on the heat source used. Two polymer heat sinks of identical geometries were produced. Their high thermal conductivity was given by the use of graphite flakes as the filler. The only difference between the heat sinks was in the position of the fan gate during their production. Different temperatures of the heat source between the two heat sinks were observed for the same measurement conditions. The measurements were conducted at Heatlab, BUT.
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spelling pubmed-80677162021-04-25 Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency Guzej, Michal Zachar, Martin Kominek, Jan Kotrbacek, Petr Brachna, Robert Polymers (Basel) Article Polymers with highly conductive fillers could possibly replace standardly used materials, such as aluminum and copper alloys, for passive cooling purposes. The main problem of the composite polymer-based heat sinks is that their high thermal conductivity is uneven. The orientation of this anisotropy is set according to the position of the highly thermally conductive filler. Its orientation is influenced by the melt flow during the polymer heat sink molding process. This article shows that change of the melt flow inside the mold cavity can improve the overall cooling efficiency of a polymer heat sink, which leads to lower temperatures on the heat source used. Two polymer heat sinks of identical geometries were produced. Their high thermal conductivity was given by the use of graphite flakes as the filler. The only difference between the heat sinks was in the position of the fan gate during their production. Different temperatures of the heat source between the two heat sinks were observed for the same measurement conditions. The measurements were conducted at Heatlab, BUT. MDPI 2021-04-07 /pmc/articles/PMC8067716/ /pubmed/33917050 http://dx.doi.org/10.3390/polym13081186 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Guzej, Michal
Zachar, Martin
Kominek, Jan
Kotrbacek, Petr
Brachna, Robert
Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency
title Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency
title_full Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency
title_fullStr Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency
title_full_unstemmed Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency
title_short Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency
title_sort importance of melt flow direction during injection molding on polymer heat sinks’ cooling efficiency
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8067716/
https://www.ncbi.nlm.nih.gov/pubmed/33917050
http://dx.doi.org/10.3390/polym13081186
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