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首页> 外文期刊>Journal of Heat Transfer >Instability of Nanofluids in Natural Convection
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Instability of Nanofluids in Natural Convection

机译：自然对流中纳米流体的不稳定性

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Instability of natural convection in nanofluids is investigated in this work. As a result of Brownian motion and thermophoresis of nanoparticles, the critical Rayleigh number is shown to be much lower, by one to two orders of magnitude, as compared to that for regular fluids. The highly promoted turbulence, in the presence of nanoparticles for as little as 1% in volume fraction, significantly enhances heat transfer in nanofluids, which may be much more pronounced than the enhancement of the effective thermal conductivity alone. Seven dominating groups are extracted from the nondimensional analysis. By extending the method of eigenfunction expansions in conjunction with the method of weighted residuals, closed-form solutions are derived for the Rayleigh number to justify such remarkable change by the nanoparticles at the onset of instability.
机译：这项工作研究了自然对流在纳米流体中的不稳定性。由于纳米粒子的布朗运动和热泳，与常规流体相比，临界瑞利数要低得多，低一到两个数量级。在纳米颗粒的体积分数低至1％的情况下，高度促进的湍流显着增强了纳米流体中的传热，这可能比单独提高有效导热率要明显得多。从无量纲分析中提取了七个主要组。通过扩展本征函数展开的方法以及加权残差的方法，可以得出瑞利数的闭式解，以证明纳米粒子在不稳定性发生时出现这种显着变化。

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