Moderate Prandtl Number Nanofluid Thermocapillary Convection Instability in Rectangular Cavity
Moderate Prandtl Number Nanofluid Thermocapillary Convection Instability in Rectangular Cavity
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DOI：
10.1007/s12217-022-09940-9
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发表时间：
2022-03
影响因子：
1.8
通讯作者：
Xiaoming Zhou;Faxuan Chi;Yanni Jiang;Qisheng Chen
中科院分区：
文献类型：
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作者：
Xiaoming Zhou;Faxuan Chi;Yanni Jiang;Qisheng Chen
本文对中等普朗特数纳米流体在矩形腔中的热毛细对流进行了数值研究，分析了纳米颗粒体积分数对流动不稳定性的影响。计算结果表明，随着纳米颗粒体积分数的增加，临界温差逐渐减小，纳米流体热毛细对流的稳定性不如基液。随着纳米粒子体积分数的增加，速度振荡幅度减小，但振荡周期增大。纳米流体振荡热毛细对流存在一个主振荡频率，随着纳米颗粒体积分数的增加，第二基频逐渐增强。
Thermocapillary convection of moderate Prandtl number nanofluid in rectangular cavity is numerically investigated in this paper, and the effect of nanoparticle volume fraction on flow instability is analyzed. The computational results show that, the critical temperature difference deceases gradually with nanoparticle volume fraction increasing, and nanofluid thermocapillary convection is less stable than the base fluid. With the increase of nanoparticle volume fraction the velocity oscillatory amplitude decreases, but the oscillatory period increases. Nanofluid oscillatory thermocapillary convection has one dominant oscillation frequency, and with nanoparticles volume fraction increasing the second fundamental frequency strengthens gradually.