纳米流体湍流和自然对流流场测量

2018/12/11   下载量： 2 次

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应用领域 其他
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参考标准 无需

使用英国Litron公司Nano T 135-15 PIV型激光器做光源，用LaVision imager intense相机做成像器件，对1立方分米尺寸正方体内纳米流体的湍流和自然对流流动进行了测量，获得了重要的流场速度场结果。

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tIncreased cooling performance is eagerly required for many cutting edge engineering and industrial tech-nologies. Nanofluids have attracted considerable interest due to their potential to enhance the thermalperformance of conventional heat transfer fluids. However, heat transfer in nanofluids is a controversialresearch theme, since there is yet no conclusive answer to explain the underlying heat transfer mech-anisms. This study investigates the physics behind the heat transfer behavior of Al2O3–H2O nanofluidsunder natural convection. A high spatial resolution flow velocimetry method – Particle Image Velocime-try – is employed in dilute nanofluids inside a Rayleigh-Benard configuration with appropriate opticalaccess. The resulting mean velocity and flow structures of pure water and nanofluids are reported andtheir overall heat transfer performances are compared for Rayleigh numbers, Ra, of the order of 109. Thispaper aims to identify the contribution of the suspended nanoparticles on the heat and mass transfermechanisms in low flow velocity applications, as those occurring during natural convection. The outcomeof this work is a first step towards the evaluation of the applicability of nanofluids in applications wheremore complex heat transfer modes, namely boiling and Critical Heat Flux, are involved that are of greatimportance for the cooling of Fusion reactors.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 整齐排列的锯齿状后缘流动的边界层特性和声学测量

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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