Development of empirical relationships for surface accommodation coefficients through investigation of nano-poiseuille flows using molecular dynamics method
KK Kammara and R Kumar, MICROFLUIDICS AND NANOFLUIDICS, 24, 70 (2020).
In this work, we have studied the effects of macroscopic (temperature of gas and wall atoms; velocity of gas near the wall) and microscopic properties (energy well-depth parameter, epsilon, used in Lennard-Jones potential to describe gas-surface interaction strength) on both energy accommodation coefficients (EAC) and tangential momentum accommodation coefficient (TMAC) using molecular dynamics approach. The effect of aforementioned properties is studied through classical force-driven nano-Poiseuille flow using argon gas and platinum walls. Parameters like temperature of wall, external force acting on gas atoms, and energy well depth (epsilon) between gas and surface are varied systematically to study the effects of these parameters on accommodation coefficients. Empirical relationship between the accommodation coefficients (TMAC and EAC) and the above-mentioned properties is obtained by performing non- linear regression analysis.
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