Self-diffusion in compressible gas flow through a microconduit

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Di Shen ◽  
Kang Ping Chen
Keyword(s):  
Gas Flow ◽  
Self Diffusion ◽  
Flow Through ◽  
Compressible Gas Flow ◽  
Compressible Gas

Compressible Gas Flow Through Smooth and Rough Microchannels

2001 ◽  
Author(s):  
Stephen E. Turner ◽  
Otto J. Gregory
Keyword(s):  
Gas Flow ◽  
Rectangular Cross Section ◽  
Continuum Theory ◽  
Reynolds Numbers ◽  
Silicon Wafers ◽  
Constant Area ◽  
Flow Through ◽  
Compressible Gas Flow ◽  
Made In ◽  
Compressible Gas

Abstract This paper presents an experimental investigation on compressible gas flow through microchannels with a constant area, rectangular cross-section. The microchannels are etched into silicon wafers, capped with smooth glass, and have hydraulic diameters between 4 and 100 μm. All measurements were made in the laminar flow regime with Reynolds numbers ranging from 0.02 to 1000. Smooth channels were obtained by etching (100) silicon wafers with potassium hydroxide (KOH) solution. Rough channel surfaces were obtained by etching (110) silicon wafers with KOH. The investigation shows that the friction factor for both smooth and rough microchannels compares closely with continuum theory.

scholarly journals The simulation of the gas flow through the porous media and fences

2019 ◽  
Vol 213 ◽  
pp. 02051
Author(s):  
Martin Kyncl ◽  
Jaroslav Pelant
Keyword(s):  
Porous Media ◽  
Gas Flow ◽  
Source Term ◽  
Initial Condition ◽  
Compressible Fluid Flow ◽  
The Face ◽  
Flow Through ◽  
Compressible Gas Flow ◽  
Original Approach ◽  
Compressible Gas

The paper is focused on the numerical simulation of the compressible gas flow through the porous media and fences. We work with the the non-stationary viscous compressible fluid flow, described by the RANS equations. The flow through the porous media is characterized by the loss of momentum. It is possible to use various methods for the simulation of such flow. Here we present the approach with the modification of the source term, and other possibilities using the modification of the face flux. The original approach was presented recently by the authors analysing the modification of the Riemann problem with one-side initial condition, complemented with the Darcy’s law and added inertial loss. Another aim of this paper is the evaluation and estimate of the forces acting on the diffusible barrier (fence) with given parameters. The presented examples were obtained with the own-developed code for the solution of the compressible gas flow.

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