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		<doi>10.1080/01457632.2020.1818423</doi>
		<issn>0145-7632</issn>
		<citationkey>RiehlMurs:2021:LiTiEx</citationkey>
		<title>Life Time Expectancy Prediction and Ageing Process of Heat Pipes Using Nanofluids</title>
		<year>2021</year>
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		<author>Riehl, Roger Ribeiro,</author>
		<author>Murshed, S. M. Sohel,</author>
		<group>CMC-ETES-DIPGR-INPE-MCTI-GOV-BR</group>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade de Lisboa</affiliation>
		<electronicmailaddress>roger.riehl@gtts.com.br</electronicmailaddress>
		<journal>Heat Transfer Engineering</journal>
		<volume>42</volume>
		<number>19/20</number>
		<pages>1755-1764</pages>
		<secondarymark>A2_ENGENHARIAS_II B1_INTERDISCIPLINAR B1_ENGENHARIAS_III B2_MATEMÁTICA_/_PROBABILIDADE_E_ESTATÍSTICA B2_CIÊNCIA_DE_ALIMENTOS</secondarymark>
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		<abstract>Nanofluids have been used in several thermal management systems, as they contribute to the augmentation of the heat dissipation rates in many applications, especially those where heat pipes, pulsating heat pipes and loop heat pipes are used. Long term use of this type of device is required in order to increase their reliability, which requires chemical compatibility between the base fluid and the nanoparticle. The verification of the non-condensable gases (NCGs) generation is required as the nanofluid undergoes thermal cycling and chemical reactions are present, along with the interaction with the device's housing material. The prediction of the amount of NCGs is necessary for each base fluid and nanofluid combination, which contributes to the evaluation of the life time expectancy for those devices. For this purpose, the use of the Arrhenius model is applied, which indicates the amount of NCG generated and the time related for which the HP must undergo the ageing process. As the stability of nanofluids is strongly connected to various thermal properties, devices' thermal efficiency as well as their longevity, it is also important to employ stable nanofluids in this type of thermal control device.</abstract>
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		<language>en</language>
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