Three-Dimensional Pore-Scale Simulation of Flow and Thermal Non-Equilibrium for Premixed Gas Combustion in a Random Packed Bed Burner
Abstract
:1. Introduction
2. Physical Model and Dimension
2.1. Governing Equation
2.2. Boundary Conditions
2.3. Mesh, Initial Conditions and Solution Method
3. Results and Discussion
3.1. Model Validation
3.2. Variation of Variables in Packed Bed
3.3. Heat Recirculation in Pore-Scale
3.4. The Non-Equilibrium
3.5. Effect of Mixture Velocity
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Symbols
Nomenclature | |
c | specific heat capacity, |
P | pressure, Pa |
hv | convective heat transfer coefficient, |
T0 | ambient temperature, K |
gas average temperature, K | |
uw, | thermal wave speed, m/s |
Wi | molecular weight of species i, |
average velocity in z direction, m/s | |
wRMS | root mean square of velocity in z direction, m/s |
Y | mass fraction |
d | diameter of pellets, m |
t, | time |
T | temperature, K |
Tg, rms | root mean square of gas temperature, K |
u | velocity in x direction, m/s |
v | velocity in y direction, m/s |
w | velocity in z direction, m/s |
x | coordinate, m |
y | coordinate, m |
z | coordinate, m |
Greek Symbols | |
thermal conductivity, | |
thermal conductivity of packing bed, | |
porosity | |
reaction rate of species i, | |
dynamic viscosity, | |
radiative thermal conductivity, | |
density, | |
thermal dispersion coefficient, | |
Stephan-Boltzmann constant, | |
solid surface emissivity | |
Subscripts | |
g | gas |
s | solid |
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Lv, J.; Shi, J.; Mao, M.; He, F. Three-Dimensional Pore-Scale Simulation of Flow and Thermal Non-Equilibrium for Premixed Gas Combustion in a Random Packed Bed Burner. Energies 2021, 14, 6939. https://doi.org/10.3390/en14216939
Lv J, Shi J, Mao M, He F. Three-Dimensional Pore-Scale Simulation of Flow and Thermal Non-Equilibrium for Premixed Gas Combustion in a Random Packed Bed Burner. Energies. 2021; 14(21):6939. https://doi.org/10.3390/en14216939
Chicago/Turabian StyleLv, Jinsheng, Junrui Shi, Mingming Mao, and Fang He. 2021. "Three-Dimensional Pore-Scale Simulation of Flow and Thermal Non-Equilibrium for Premixed Gas Combustion in a Random Packed Bed Burner" Energies 14, no. 21: 6939. https://doi.org/10.3390/en14216939