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Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al(2)O(3)-Water Nanofluids in Microchannels of Different Aspect Ratio

The study of the influence of the nanoparticle volume fraction and aspect ratio of microchannels on the fluid flow and heat transfer characteristics of nanofluids in microchannels is important in the optimal design of heat dissipation systems with high heat flux. In this work, the computational flui...

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Autores principales: Wu, Huajie, Zhang, Shanwen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8399403/
https://www.ncbi.nlm.nih.gov/pubmed/34442490
http://dx.doi.org/10.3390/mi12080868
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author Wu, Huajie
Zhang, Shanwen
author_facet Wu, Huajie
Zhang, Shanwen
author_sort Wu, Huajie
collection PubMed
description The study of the influence of the nanoparticle volume fraction and aspect ratio of microchannels on the fluid flow and heat transfer characteristics of nanofluids in microchannels is important in the optimal design of heat dissipation systems with high heat flux. In this work, the computational fluid dynamics method was adopted to simulate the flow and heat transfer characteristics of two types of water-Al(2)O(3) nanofluids with two different volume fractions and five types of microchannel heat sinks with different aspect ratios. Results showed that increasing the nanoparticle volume fraction reduced the average temperature of the heat transfer interface and thereby improved the heat transfer capacity of the nanofluids. Meanwhile, the increase of the nanoparticle volume fraction led to a considerable increase in the pumping power of the system. Increasing the aspect ratio of the microchannel effectively improved the heat transfer capacity of the heat sink. Moreover, increasing the aspect ratio effectively reduced the average temperature of the heating surface of the heat sink without significantly increasing the flow resistance loss. When the aspect ratio exceeded 30, the heat transfer coefficient did not increase with the increase of the aspect ratio. The results of this work may offer guiding significance for the optimal design of high heat flux microchannel heat sinks.
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spelling pubmed-83994032021-08-29 Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al(2)O(3)-Water Nanofluids in Microchannels of Different Aspect Ratio Wu, Huajie Zhang, Shanwen Micromachines (Basel) Article The study of the influence of the nanoparticle volume fraction and aspect ratio of microchannels on the fluid flow and heat transfer characteristics of nanofluids in microchannels is important in the optimal design of heat dissipation systems with high heat flux. In this work, the computational fluid dynamics method was adopted to simulate the flow and heat transfer characteristics of two types of water-Al(2)O(3) nanofluids with two different volume fractions and five types of microchannel heat sinks with different aspect ratios. Results showed that increasing the nanoparticle volume fraction reduced the average temperature of the heat transfer interface and thereby improved the heat transfer capacity of the nanofluids. Meanwhile, the increase of the nanoparticle volume fraction led to a considerable increase in the pumping power of the system. Increasing the aspect ratio of the microchannel effectively improved the heat transfer capacity of the heat sink. Moreover, increasing the aspect ratio effectively reduced the average temperature of the heating surface of the heat sink without significantly increasing the flow resistance loss. When the aspect ratio exceeded 30, the heat transfer coefficient did not increase with the increase of the aspect ratio. The results of this work may offer guiding significance for the optimal design of high heat flux microchannel heat sinks. MDPI 2021-07-24 /pmc/articles/PMC8399403/ /pubmed/34442490 http://dx.doi.org/10.3390/mi12080868 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
Wu, Huajie
Zhang, Shanwen
Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al(2)O(3)-Water Nanofluids in Microchannels of Different Aspect Ratio
title Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al(2)O(3)-Water Nanofluids in Microchannels of Different Aspect Ratio
title_full Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al(2)O(3)-Water Nanofluids in Microchannels of Different Aspect Ratio
title_fullStr Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al(2)O(3)-Water Nanofluids in Microchannels of Different Aspect Ratio
title_full_unstemmed Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al(2)O(3)-Water Nanofluids in Microchannels of Different Aspect Ratio
title_short Numerical Study on the Fluid Flow and Heat Transfer Characteristics of Al(2)O(3)-Water Nanofluids in Microchannels of Different Aspect Ratio
title_sort numerical study on the fluid flow and heat transfer characteristics of al(2)o(3)-water nanofluids in microchannels of different aspect ratio
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8399403/
https://www.ncbi.nlm.nih.gov/pubmed/34442490
http://dx.doi.org/10.3390/mi12080868
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