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Nanofluid heat transfer within a pipe equipped with external device
International Communications in Heat and Mass Transfer ( IF 7 ) Pub Date : 2021-07-27 , DOI: 10.1016/j.icheatmasstransfer.2021.105487
Yinghong Qin 1, 2
Affiliation  

In this simulation, augmentation of turbulent intensity due to install of corrugated tapes has been scrutinized. To involve the unfavorable effect of turbulator both irreversibility and Darcy factor were investigated. Low concentration of nano sized powders allows us employing the uniform fraction inside the tube. The new fluid has properties better than water in view of thermal characteristics. Sgen,f and Sgen,th augment about 97.8% and 18.2% with rise of BR from 0.25 to 0.5 when PR = 1.693. As BR rises from 0.25 to 0.75, Sgen,f and Sgen,th rises 224.2% and 155.3% when PR = 1.693. At BR = 0.75, growth of PR results in reduce of Sgen,f and Sgen,th about 7.58% and 75.6%, respectively. Both geometric parameters have same impacts on Nu and f. Although augment of BR results in 61.5% augmentation in ∇P, Nu augments about 18.3% as BR changes from 0.25 to 0.75 when PR = 1.693. To reach 8.76% augmentation in Nu when BR = 0.75, PR should be decreased from 1.693 to 0.56433. Also, same change can augment the Darcy factor about 27.9%.



中文翻译:

配备外部装置的管道内的纳米流体传热

在该模拟中,仔细研究了由于安装瓦楞纸带而导致的湍流强度增加。为了涉及湍流器的不利影响,研究了不可逆性和达西因子。低浓度的纳米尺寸粉末使我们能够在管内采用均匀的分数。考虑到热特性,新流体的特性优于水。当 PR = 1.693 时,随着 BR 从 0.25 上升到 0.5,S gen,f和 S gen,th 分别增加了约 97.8% 和 18.2%。随着 BR 从 0.25 上升到 0.75,当 PR = 1.693 时,S gen,f和 S gen,th 分别上升 224.2% 和 155.3%。在 BR = 0.75 时,PR 的增长导致 S gen,f和 S gen,th 减少分别约为 7.58% 和 75.6%。两个几何参数对Nu和 f都有相同的影响。尽管 BR 的增加导致 ∇P增加61.5%,但当 PR = 1.693 时,随着 BR 从 0.25 变为 0.75 ,Nu增加了约 18.3%。当 BR = 0.75 时,要在Nu 中达到 8.76% 的增加,PR 应该从 1.693 减少到 0.56433。此外,同样的变化可以将达西因子增加约 27.9%。

更新日期:2021-07-27
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