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Numerical study on heat transfer and flow characteristics of nanofluids in a circular tube with trapezoid ribs

This study aims to investigate heat transfer and flow characteristics of ethylene glycol/water (EGW) and CuO–EGW nanofluids in circular tubes with and without trapezoid ribs. Nusselt number and friction factor in tubes with trapezoid ribs are analysed under a constant heat flux by changing rib botto...

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Bibliographic Details
Published in:Open Physics 2021-04, Vol.19 (1), p.224-233
Main Authors: Wang, Wei, Zhang, Bo, Cui, Lanhua, Zheng, Hongwei, Klemeš, Jiří Jaromír, Wang, Jin
Format: Article
Language:English
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Summary:This study aims to investigate heat transfer and flow characteristics of ethylene glycol/water (EGW) and CuO–EGW nanofluids in circular tubes with and without trapezoid ribs. Nusselt number and friction factor in tubes with trapezoid ribs are analysed under a constant heat flux by changing rib bottom angles. This study compares the convective heat transfer coefficients of 6 vol.% CuO–EGW nanofluid and base fluid. It is found that under a constant Reynolds number, the Nusselt number and friction factor for CuO–EGW nanofluid and base fluid increase with an increase in the inclination angle. The Nusselt number for the CuO–EGW nanofluid in the tube with 75° rib bottom angle averagely increases by 135.8% compared to that in the smooth tube, and the performance evaluation criterion is 1.64.
ISSN:2391-5471
2391-5471
DOI:10.1515/phys-2021-0022