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首页> 外文期刊>International Journal of Heat and Mass Transfer >Interferometric study of heat transfer characteristics of Al_2O_3 and SiO_2-based dilute nanofluids under simultaneously developing flow regime in compact channels
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Interferometric study of heat transfer characteristics of Al_2O_3 and SiO_2-based dilute nanofluids under simultaneously developing flow regime in compact channels

机译：紧通道内同时发展流态下Al_2O_3和SiO_2基稀纳米流体传热特性的干涉测量研究

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摘要

Performance evaluation of two types of nanofluids in influencing the heat transfer phenomena in the context of compact channels has been presented. Experiments have been conducted in forced convection regime for a range of Reynolds numbers. Three different types of coolant fluids i.e. de-ionized water (base fluid), Al_2O_3 and SiO_2-based dilute nanofluids with volumetric concentrations of 0.005%, 0.01% and 0.02% have been employed. A Mach-Zehnder interferometer has been used for recording the real time projection data of the convective field. The interferometer has been operated in infinite as well as wedge fringe setting mode. The infinite fringe setting images have been employed for discussing the effect of nanopar-ticles on phenomena like thermal boundary layer profiles, changes in the thickness of thermal boundary layers, etc. The wedge interferograms have been employed for quantitative analysis. A direct comparison of heat transfer characteristics of Al_2O_3 and SiO_2 nanoparticles has been presented on the basis of their relative influence on the thickness of thermal boundary layers, temperature gradients and the resultant heat transfer rates. The results of the study clearly reveal the effectiveness and higher heat transfer characteristics of Al_2O_3 nanoparticles than that of SiO_2. It is seen that the Al_2O_3 nanoparticles have greater ability in disrupting the thermal boundary layer profiles and lead to higher percentage reduction in the thickness of thermal boundary layers. The resultant heat transfer coefficients with Al_2O_3-based dilute nanofluids have been found to be significantly higher than the base fluid and the SiO_2-based nanofluids for any given volumetric concentration. It is experimentally demonstrated that the phenomena like increased thermal conductivity, boundary layer disruptions and advection effects primarily control the heat transfer rates in the lower range of Reynolds numbers (Re ＜ 500) while at higher Reynolds numbers, it is mainly the advection effects that influence the heat transfer coefficients in the range of volume concentrations of dilute nanofluids employed in the experiments.
机译：已经提出了两种类型的纳米流体在致密通道中影响传热现象的性能评估。已经在强制对流方式下对一系列雷诺数进行了实验。已经使用了三种不同类型的冷却剂流体，即去离子水（基础流体），Al_2O_3和SiO_2基稀纳米流体，其体积浓度为0.005％，0.01％和0.02％。马赫曾德尔干涉仪已用于记录对流场的实时投影数据。干涉仪已在无限和楔形条纹设置模式下运行。无限边缘设置图像已用于讨论纳米粒子对热边界层轮廓，热边界层厚度变化等现象的影响。楔形干涉图已用于定量分析。根据Al_2O_3和SiO_2纳米粒子对热边界层厚度，温度梯度和所得传热速率的相对影响，提出了直接比较的方法。研究结果清楚地表明，Al_2O_3纳米颗粒的有效性和传热特性均高于SiO_2。可以看出，Al_2O_3纳米颗粒具有更强的破坏热边界层轮廓的能力，并导致热边界层厚度的更大百分比降低。已经发现，在任何给定的体积浓度下，基于Al_2O_3的稀纳米流体的最终传热系数都明显高于基础流体和基于SiO_2的纳米流体。实验证明，在较低的雷诺数（Re ＜500）范围内，热导率增加，边界层破坏和对流效应等现象主要控制传热速率，而在较高的雷诺数下，主要是对流效应影响在实验中使用的稀纳米流体的体积浓度范围内的传热系数。

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