Measurements and modeling of the gas flow in a microchannel: influence of aspect ratios, surface nature, and roughnesses - Archive ouverte HAL Access content directly
Journal Articles Microfluidics and Nanofluidics Year : 2019

Measurements and modeling of the gas flow in a microchannel: influence of aspect ratios, surface nature, and roughnesses

(1, 2) , (3) , (1, 2) , (3)
1
2
3

Abstract

7 This article extends in various directions our previous studies related to gas flow in long rectangular cross-section microchannels. In the present article, the mass flow rate of various gases through microchannels with different aspect ratios and, various surface coatings (Au and SiO 2) and surface roughnesses (from 0.9 to 12nm) is measured under isothermal conditions. Previously, we developed a method to calculate the mass flow rate through rectangular microchannels that allows taking into account the real dimensions of the rectangular channel cross-section. In the present article, this method was applied to extract the velocity slip and tangential momentum accommodation coefficients in the frame of the Maxwell diffuse-specular scattering kernel. An extension of the previous approach is also proposed in the present paper. This extension allows considering the possible difference in properties (roughness or material) between the vertical and horizontal channel walls by introducing different accommodation coefficients for each wall. By applying the new method, we can extract a single accommodation coefficient for all the channel walls under the assumption of homogeneous material and roughness and two different accommodation coefficients for the horizontal and vertical walls in the case when the two walls have different properties (roughness or material).
Fichier principal
Vignette du fichier
POF_RUG_v19R21_final.pdf (779.99 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-02904989 , version 1 (22-07-2020)

Identifiers

Cite

Pierre Perrier, Mustafa Hadj-Nacer, J. Gilbert Meolans, Irina Martin Graur. Measurements and modeling of the gas flow in a microchannel: influence of aspect ratios, surface nature, and roughnesses. Microfluidics and Nanofluidics, 2019, 23 (97), ⟨10.1007/s10404-019-2259-1⟩. ⟨hal-02904989⟩
142 View
107 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More