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Numerical investigation of effective parameters in convective heat transfer of nanofluids flowing under a laminar flow regime

机译:层流状态下流动的对流传热有效参数的数值研究

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This article presents a numerical investigation on heat transfer performance and pressure drop of nanofluids flows through a straight circular pipe in a laminar flow regime and constant heat flux boundary condition. Al_2O_3, CuO, carbon nanotube (CNT) and titanate nanotube (TNT) nanopartides dispersed in water and ethylene glycol/water with particle concentrations ranging between 0 and 6 vol.% were used as working fluids for simulating the heat transfer and flow behaviours of nanofluids. The proposed model has been validated with the available experimental data and correlations. The effects of particle concentrations, particle diameter, particles Brownian motions, Reynolds number, type of the nanopartides and base fluid on the heat transfer coefficient and pressure drop of nanofluids were determined and discussed in details. The results indicated that the particle volume concentration, Brownian motion and aspect ratio of nanopartides similar to flow Reynolds number increase the heat transfer coefficient, while the nano-particle diameter has an opposite effect on the heat transfer coefficient. Finally, the present study provides some considerations for the appropriate choice of the nanofluids for practical applications.
机译:本文提出了在层流状态和恒定热通量边界条件下,流经直圆形管的纳米流体的传热性能和压降的数值研究。将Al_2O_3,CuO,碳纳米管(CNT)和钛酸酯纳米管(TNT)纳米粒子分散在水和乙二醇/水中,粒子浓度范围为0至6%(体积),用作模拟纳米流体的传热和流动行为的工作流体。 。所提出的模型已通过可用的实验数据和相关性进行了验证。确定并详细讨论了粒子浓度,粒径,粒子布朗运动,雷诺数,纳米粒子和基础流体的类型对纳米流体的传热系数和压降的影响。结果表明,与流动雷诺数相似的纳米粒子的体积浓度,布朗运动和长宽比增加了传热系数,而纳米粒径对传热系数却产生了相反的影响。最后,本研究为实际应用中纳米流体的适当选择提供了一些考虑。

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