Experimental study of friction factors of multi-walled carbon nanotubes/water flow inside helical double-pipe heat exchangers

The Iranian Journal of Textile Nano-bio Modification

دوره 1، شماره 1، شهریور 2022، صفحه 62-72   

نوع مقاله: Original Article

شناسه دیجیتال (DOI): 10.30495/ijtnbm.2023.1974689.1016

نویسندگان

Farzad Fathian¹؛ Seyed Ali Agha Mirjalily^{* 1}؛ Mohammad Reza Salimpour²؛ Seyed Amir Abbas Oloomi¹

¹Department of Mechanical Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran

²Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran.

چکیده

This study presents the findings of experiments on the impact of multi-walled carbon nanotubes on the pressure drop of the flow in helical annuli. The exterior of the heat exchanger is insulated. The nanofluid travels through the annulus as hot water flows through the inner helical tube. Two double-pipe cases are produced, each with a different curvature ratio. Several experiments are conducted to assess the effect of the coiled annuli geometry on the flow pressure drop. Additionally, the effects of the Dean Number and nanotube concentration are examined. The results indicated that the friction factors related to the nanofluid flow are higher than those of water, but our previous study demonstrated that they have superior heat transfer coefficients. Therefore, the performance evaluation criteria are achieved. In all the cases, they are higher than unity showing the superiority of this kind of heat exchanger.

کلیدواژه‌ها

Friction Factor؛ Helical Annuli؛ Nanofluid؛ Multi-Walled Carbon Nanotube؛ PEC

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