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ARTICLE
Experimental Study on Flow and Heat Transfer Characteristics of Nanofluids in a Triangular Tube at Different Rotation Angles
Cong Qi1,2,*, Chengchao Wang1,2, Jinghua Tang1,2, Dongtai Han2
1 Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xuzhou, 221116, China
2 School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China
* Corresponding Author: Cong Qi. Email:
Energy Engineering 2020, 117(2), 63-78. https://doi.org/10.32604/EE.2020.010433
Received 04 March 2020; Accepted 14 April 2020; Issue published 23 April 2020
Abstract
Because of the poor thermal performance of ordinary tubes, a
triangular tube was used to replace the smooth channel in the heat transfer
system, and nanofluids were used to take the place of ordinary fluids as the heat
transfer medium. High stability nanofluids were prepared, and an experimental
set on flow and heat exchange was established. Effects of triangular tube rotation
angles (α = 0°, 30°, 60°) as well as mass fractions of nanofluids (ω = 0.1%, 0.3%,
0.5%) on heat exchange and flow performance were experimentally considered
at Reynolds numbers (Re = 800–8000). It was shown that the triangular tube
with a rotation angle α = 0° possesses the most excellent thermal property,
followed by a rotation angle α = 60° triangular tube, and a rotation angle α = 30° triangular tube has the worst heat exchange property. Results also revealed that
resistance coefficients of the triangular tube with rotation angles α = 0° and α =
30° are close to each other, and a rotation angle α = 60° triangular tube shows the
minimal resistance coefficient. It could be also seen that higher nanoparticle
mass fraction can augment the thermal performance. However, higher
nanoparticle mass fraction can also lead to an increment in resistance coefficient. A comprehensive performance evaluation index was introduced to appraise the
augment in Nusselt number and flow resistance coefficient. The experiment
revealed that the highest index emerges with nanofluids (ω = 0.5%) in the
triangular tube with a rotation angle α = 0°.
Keywords
Cite This Article
Qi, C., Wang, C., Tang, J., Han, D. (2020). Experimental Study on Flow and Heat Transfer Characteristics of Nanofluids in a Triangular Tube at Different Rotation Angles.
Energy Engineering, 117(2), 63–78. https://doi.org/10.32604/EE.2020.010433
Citations