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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Mohammad Sajjad Mozaffari & Ehsan Roohi, 2017. "On the thermally-driven gas flow through divergent micro/nanochannels," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 28(12), pages 1-22, December.
    • Handle: RePEc:wsi:ijmpcx:v:28:y:2017:i:12:n:s0129183117501431
    DOI: 10.1142/S0129183117501431
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