Back to Search
Start Over
Mixing at high Schmidt number in a complex porous structure
- Source :
- Chemical Engineering Science. 150:74-84
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Highly porous structures (porosity ≥75%), as metal foams or designed foam-like structures, are often used in industry to augment heat and mass transfer. In the present study, we focus on the mixing in highly porous structures in continuous millireactor characterized with a relatively low Reynolds number (ReD=240 – based on the ligament diameter and bulk velocity) and a high Schmidt number fluid (Sc=2400). We apply a combined numerical and experimental approach. The numerical simulations employ a Large Eddy Simulation (LES) method with dynamic Lagrangian approach for subgrid-scale turbulent stress and turbulent mass flux. The results of the numerical simulation are compared with our own combined Particle Imaging Velocimetry (PIV) and Laser Induced Fluorescence (LIF) measurements. The application of combined PIV/LIF makes it possible to simultaneously measure velocity components, turbulent stresses, concentration and concentration fluxes. The mechanism of the mixing is analyzed in detail with specific focus on validity of a simple gradient diffusion hypothesis (SGDH) in modeling of the turbulent mass transfer in complex porous structure.
- Subjects :
- Mass flux
Chemistry
Turbulence
Applied Mathematics
General Chemical Engineering
Schmidt number
Mixing (process engineering)
Reynolds number
02 engineering and technology
General Chemistry
Mechanics
021001 nanoscience & nanotechnology
01 natural sciences
Industrial and Manufacturing Engineering
010305 fluids & plasmas
Physics::Fluid Dynamics
symbols.namesake
Classical mechanics
Mass transfer
0103 physical sciences
symbols
0210 nano-technology
Porous medium
Large eddy simulation
Subjects
Details
- ISSN :
- 00092509
- Volume :
- 150
- Database :
- OpenAIRE
- Journal :
- Chemical Engineering Science
- Accession number :
- edsair.doi...........42aa014f01e80f4680a432ba3df146cf