Vol.117, No.2, 2020, pp.63-78, doi:10.32604/EE.2020.010433
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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:
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
Nanofluids; forced convection; heat transfer enhancement; triangular tube; rotation angle
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.
Citations
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