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http://dx.doi.org/10.14775/ksmpe.2021.20.06.082

A Study on the Effect of Nanofluids Flow Direction in Double Pipe  

Choi, Hoon-Ki (School of Mechanical Engineering, Changwon National University)
Lim, Yun-Seung (School of Mechanical Engineering, Changwon National University)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.20, no.6, 2021 , pp. 82-91 More about this Journal
Abstract
We compared the heat transfer characteristics of the parallel and the counterflow flow in the concentric double tube of the Al2O3/water nanofluids using numerical methods. The high- and low-temperature fluids flow through the inner circular tube and the annular tube, respectively. The heat transfer characteristics according to the flow direction were compared by changing the volume flow rate and the volume concentration of the nanoparticles. The results showed that the heat transfer rate and overall heat transfer coefficient improved compared to those of basic fluid with increasing the volume and flow rate of nanoparticles. When the inflow rate was small, the heat transfer performance of the counterflow was about 22% better than the parallel flow. As the inflow rate was increased, the parallel flow and the counterflow had similar heat transfer rates. In addition, the effectiveness of the counterflow increased from 10% to 22% rather than the parallel flow. However, we verified that the increment in the friction factor of the counterflow is not large compared to the increment in the heat transfer rate.
Keywords
$Al_2O_3$/water Nanofluid; Counter Flow; Parallel Flow; Volume Concentration; Overall Heat Transfer Coefficient; Heat Transfer Rate;
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