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首页> 外文期刊>Thermal engineering >Analysis of Alumina/Water Nanofluid in Thermally Developing Region of a Circular Tube1
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Analysis of Alumina/Water Nanofluid in Thermally Developing Region of a Circular Tube1

机译：圆管热显影区域中氧化铝/水纳米流体的分析1

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摘要

Analysis of Al_2O_3/water nanofluid flow in thermally developing region of a circular tube is the subject of present numerical study. In order to consider the hydrodynamically fully developed condition in the tube, a fully developed velocity profile is defined in the inlet section of tube. Three-dimensional computations are performed for a wide variety of nanoparticle concentrations (1 ≤ γ≤ 10%). On the other hand, for examination of nanoparticle size, effects on the thermal characteristics, two different particle sizes of d_p = 25 and 75 nm are applied. The resulting governing equations are solved numerically by means of the finite volume method. For enhanced visualization, different results are presented in thermally developing region. It is obtained that suspending the Al_2O_3 nanoparticles in pure water increases the thermal boundary layer growing rate. In addition, an increase on the heat transfer rate is observed in thermal boundary layer using the Al_2O_3 nanoparticles in which this enhancement varies as a function of nanoparticle size and nanoparticle volume concentration. However, it is found that the role of nanoparticle volume concentration on the thermal characteristics such as thermal boundary layer growing rate, temperature gradient, and heat transfer enhancement is significantly important comparing to the nanoparticle size.
机译：目前数值研究的主题是分析圆管热显影区域中的Al_2O_3 /水纳米流体流动。为了考虑在管中的流体动力学充分发展的状况，在管的入口部分中定义了充分发展的速度曲线。对各种纳米颗粒浓度（1≤γ≤10％）进行三维计算。另一方面，为了检查纳米粒度，对热特性的影响，应用了两种不同的d_p = 25和75 nm的粒度。所得的控制方程通过有限体积法进行数值求解。为了增强可视化效果，在热显影区域显示了不同的结果。获得的结果是，将Al_2O_3纳米颗粒悬浮在纯水中可提高热边界层的生长速率。另外，在使用Al_2O_3纳米颗粒的热边界层中观察到传热速率的增加，其中该增强随纳米颗粒尺寸和纳米颗粒体积浓度的变化而变化。然而，发现与纳米颗粒尺寸相比，纳米颗粒体积浓度对热特性如热边界层生长速率，温度梯度和传热增强的作用非常重要。

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