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

Mohammad Sajjad Mozaffari () and Ehsan Roohi
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Mohammad Sajjad Mozaffari: High Performance Computing (HPC) Laboratory, Department of Mechanical Engineering, Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran
Ehsan Roohi: High Performance Computing (HPC) Laboratory, Department of Mechanical Engineering, Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran

International Journal of Modern Physics C (IJMPC), 2017, vol. 28, issue 12, 1-22

Abstract: 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.

Keywords: Divergent micro/nanochannel; thermally-driven flows; rarefied gas flow; direct simulation Monte Carlo (DSMC) (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0129183117501431

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