The present work is focused on a novel cooling device consisting of a microchannel and nanofluid synthetic jet generated through the activation of membrane oscillation at frequencies () of 280, 420 and 560 Hz and five different amplitudes () ranging from 20 to 40 μm AlO nanoparticles in the fluid domain are set at particle volume fractions () of 2, 3 and 5% with diameter sizes of 50, 75 and 100 nm. The single-phase model (SPM) and Eulerian-Lagrangian (DPM) model are applied and compared to examine the fluid flow and heat transfer enhancement followed by validation against experimental data. Parametric studies reveal that the best heat transfer enhancement is found at a setting of φ = 2% and an oscillating frequency of 560 Hz with an amplitude of 30 μm for nanoparticles 100 nm in size. Comparison between SPM and DPM shows that there is an over-prediction of heat transfer enhancement in the SPM while DPM cooling is more realistic through the consideration of different forces acting on the particles and base fluid. The thermophoresis force is identified as the most significant force contributing to the heat transfer coefficient. It is further concluded that better heat transfer enhancement is achieved through the adoption of smaller particle diameters and higher oscillation membrane frequencies.

中文翻译：

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使用单相和欧拉-拉格朗日模型评估配备合成射流的微通道中的 Al2O3-水纳米流体


目前的工作重点是一种新型冷却装置，该装置由微通道和纳米流体合成射流组成，该合成射流是通过激活膜振荡而产生的，频率为 280、420 ​​和 560Hz，五种不同振幅为 20 至 40μm Al2O3 纳米粒子流体域中的颗粒体积分数 () 设置为 2%、3% 和 5%，直径尺寸为 50、75 和 100nm。应用并比较单相模型 (SPM) 和欧拉-拉格朗日 (DPM) 模型来检查流体流动和传热增强，然后根据实验数据进行验证。参数研究表明，对于尺寸为 100 nm 的纳米粒子，在 φ=2% 的设置和 560Hz 的振荡频率、30μm 的振幅下发现最佳传热增​​强。 SPM和DPM的比较表明，SPM对传热增强的预测过高，而DPM冷却通过考虑作用在颗粒和基液上的不同力而更加现实。热泳力被认为是对传热系数贡献最大的力。进一步得出结论，通过采用更小的颗粒直径和更高的振荡膜频率可以实现更好的强化传热。