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Numerical Characterization of the Solid Particle Accumulation in a Turbulent Flow through Curved Pipes by Means of Stokes Numbers
- Source :
- Applied Sciences, Vol 11, Iss 7381, p 7381 (2021), Applied Sciences, Volume 11, Issue 16
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- The accumulation of particles in a turbulent flow of incompressible air with mono-dispersed solid particles inside a 90° pipe bend was simulated using ANSYS® Fluent (CFD), taking into account the effect of gravity, drag force and a bidirectional fluid-particle coupling. An analysis of the geometrical parameters and the structures of the secondary flow generated in a curved pipe (Dean vortices) was developed, thus determining the characteristic time scales of the flow. Four Stokes numbers (Stk) were formulated, whose values are calculated and studied from the numerical simulations performed. Two different particle sizes (d1 = 50 μm y d2 = 150 μm), at two different flow conditions (Re1 = 61,500 y Re2 = 173,972), and for three curvature ratios Rc/R = 1, 4 and 8 were studied. The flow was solved using a Eulerian–Lagrangian approach with a RNG k-ε turbulence model. Once the multiphase flow was solved and validated, the distribution and maximum particle concentration inside the 90° bend were presented. Additionally, the Stk numbers were calculated to estimate the possible particle concentration level for the different system configurations (dp, Re and Rc/R). It is concluded that, if all Stk numbers are less than one, relative concentration levels reach a minimum, while for Stk numbers larger than one, an increase in the maximum concentration inside the pipe bend was noticed.
- Subjects :
- solid particle accumulation
Technology
QH301-705.5
multiphase flow
QC1-999
Stokes number
Physics::Fluid Dynamics
Coupling (piping)
General Materials Science
Biology (General)
Instrumentation
QD1-999
Fluid Flow and Transfer Processes
Physics
turbulent flow
Turbulence
Process Chemistry and Technology
Multiphase flow
General Engineering
Mechanics
Secondary flow
Engineering (General). Civil engineering (General)
Computer Science Applications
Chemistry
Flow (mathematics)
Drag
Particle
TA1-2040
Subjects
Details
- Language :
- English
- ISSN :
- 20763417
- Volume :
- 11
- Issue :
- 7381
- Database :
- OpenAIRE
- Journal :
- Applied Sciences
- Accession number :
- edsair.doi.dedup.....8697bdd247fbd682aeae5887c59be66f