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On the thermally-driven gas flow through divergent micro/nanochannels

机译:通过发散微/纳米的热驱动气体流动

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A detailed study on thermally driven flows through divergent micro/nanochannels is presented. Rarefied gas flow behavior and thermal mass flow rate were investigated with different divergence angles ranging between 0° and 7° at two aspect ratios (AR=L∕Hin=6,20) using particle-based direct simulation Monte-Carlo (DSMC) method. We compare our DSMC solutions for normalized thermal mass flow rate with the numerical solution of the Boltzmann–Krook–Walender (BKW) model and Bhatnagar–Gross–Krook (BGK) model and asymptotic theory over a wide range of Knudsen number in the transition regime. The flow field properties including Mach number, pressure, overall temperature and magnitude of shear stress are examined in detail. Based on our analysis, we observed an approximately constant velocity and pressure distribution at a microchannel with a small opening angle. Our results also demonstrate that the heat lines from weakly nonlinear form of Sone constitutive law and DSMC show good agreement at low Knudsen numbers. Moreover, we show that the effect of divergence angle is influential in increasing normalized thermal mass flow rate at early transition regime.
机译:介绍了通过发散微/纳米热驱动的热驱动流的​​详细研究。使用颗粒基直接仿真Monte-Carlo(DSMC)方法,在两个纵横比(AR = L / HIN = 6,20)下,在0°和7°之间进行稀有的气体流动和热质量流量。 。我们将DSMC解决方案与归一化的热质量流量进行比较,与Boltzmann-Krook-Walender(BKW)模型和Bhatnagar-Gross-Krook(BGK)模型和渐近理论在过渡方案中的广泛knudsen号码中的数字解决方案。详细地检查包括马赫数,压力,总温度和剪切应力的总温度和幅度的流场性能。基于我们的分析,我们在具有小开口角度的微通道中观察到微通道的近似恒定速度和压力分布。我们的结果还表明,来自弱非线性形式的SONE本构法和DSMC的热线在低Chaudsen号码中表现出良好的一致性。此外,我们表明,发散角的效果在早期过渡方案中增加了归一化热质量流速的影响。

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