Thermal and Flow Analysis of TiO2 Nanofluid Flow in Circular and Square Ducts with Multiple Twisted Tape Inserts

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY

Journal of Nanofluids Pub Date : 2023-04-01 DOI:10.1166/jon.2023.1913

Amelia Shi Hann Wong, A. N. T. Tiong

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Abstract

A numerical study is conducted to observe the thermal and flow performance of TiO2 nanofluid in the circular and square ducts with different twisted tape arrangements. The presence of the twisted tape in the tube induces swirl flow, which aids in the heat transfer, but at the penalty of a higher friction factor. The results also reveal that the maximum Nusselt number enhancement is obtained in the circular tube when the counter-triple twisted tape arrangement (C-TTs) is adopted while it is co-triple twisted tape arrangement (Co-TTs) for the case of square duct. Besides, the highest friction factor is observed for the Co-TTs for both circular and square ducts. The heat transfer and friction factor in the circular duct are greater than that of the square duct. The highest thermal performance factor of 1.286 is obtained when the single twisted tape and 1.5% nanofluid are used in the circular tube. However, multiple twisted tape inserts in the square duct contributes to improved thermal performance at a relatively lower friction factor when compared to the circular tube. Therefore, it is recommended to implement the square duct with multiple inserts for compact or microchannel heat exchanger for heat transfer application.

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TiO2纳米流体在圆形和方形管道中流动的热分析和流动分析

通过数值研究，观察了TiO2纳米流体在不同扭带排列的圆形和方形管道中的热性能和流动性能。管中扭曲带的存在会引起涡流，这有助于传热，但会以更高的摩擦系数为代价。结果还表明，当采用反三重扭带排列（C-TTs）时，圆管中的努塞尔数增强最大，而对于方形管道，采用共三重扭带排列（co-TTs）时，努塞尔数增加最大。此外，对于圆形和方形管道，Co-TT的摩擦系数最高。圆形风管的传热系数和摩擦系数大于方形风管。当在圆管中使用单根扭带和1.5%的纳米流体时，获得了1.286的最高热性能因子。然而，与圆形管道相比，方形管道中的多个扭带插入件以相对较低的摩擦系数有助于改善热性能。因此，建议采用带有多个插件的方形管道，用于紧凑型或微通道换热器的传热应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nanofluids NANOSCIENCE & NANOTECHNOLOGY-

自引率

14.60%

发文量

期刊介绍： Journal of Nanofluids (JON) is an international multidisciplinary peer-reviewed journal covering a wide range of research topics in the field of nanofluids and fluid science. It is an ideal and unique reference source for scientists and engineers working in this important and emerging research field of science, engineering and technology. The journal publishes full research papers, review articles with author''s photo and short biography, and communications of important new findings encompassing the fundamental and applied research in all aspects of science and engineering of nanofluids and fluid science related developing technologies.