文章基本信息

标题：Enhancing laminar forced convection heat transfer by using Al2O3/PCM nanofluids in a concentric double-tube duct
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作者：C.J. Ho ; S.H. Huang ; Chi-Ming Lai 等
期刊名称：Case Studies in Thermal Engineering
印刷版ISSN：2214-157X
电子版ISSN：2214-157X
出版年度：2022
卷号：35
页码：102147
语种：English
出版社：Elsevier B.V.
摘要：In this study, a tube with a smaller diameter was inserted in an isoflux heated circular tube to form a concentric double-tube duct. The forced convection heat transfer enhancement efficacy of using concurrent flows of Al2O3/PCM nanofluids through outer annulus/inner tube of this resulting double-tube duct to replace its parent single-tube (with water) was experimentally investigated. The results showed that a high total flow rate combined with a high concurrent flow ratio could effectively increase heat transfer effectiveness. When heating power = 200 W, Reynolds number = 1700, and the concurrent flow ratio = 2.38, for 1% Al2O3-water nanofluid in the outer annulus and 4.63% phase-change nanofluid in the inner tube, the convective heat transfer increased by 32%. Due to the excessive pressure drop, the figures of merit of the investigated objectives are all less than 1.
关键词：Internal forced convection Laminar tube flow Phase-change nanofluid PCM Alumina nanoparticle Double tube