TY - JOUR
T1 - Enhancing laminar forced convection heat transfer by using Al2O3/PCM nanofluids in a concentric double-tube duct
AU - Ho, C. J.
AU - Huang, S. H.
AU - Lai, Chi Ming
N1 - Funding Information:
This study is supported by the Ministry of Sciences and Technologies (MOST) of ROC in Taiwan through Project No. NSC 107-2221-E006-209-MY3 .
Publisher Copyright:
© 2022 The Authors.
PY - 2022/7
Y1 - 2022/7
N2 - 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.
AB - 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.
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U2 - 10.1016/j.csite.2022.102147
DO - 10.1016/j.csite.2022.102147
M3 - Article
AN - SCOPUS:85131541966
SN - 2214-157X
VL - 35
JO - Case Studies in Thermal Engineering
JF - Case Studies in Thermal Engineering
M1 - 102147
ER -