Abstract
Thermal microscale gas flow was simulated into a coplanar microchannel was simulated at a broad range of Knudsen numbers. Attempts were made to improve the accuracy of slip velocity on walls using a modified model with two relaxation times based upon the mesoscopic method. The temperature jump of fluid flow at the wall was captured by a model with a single relaxation time using a second-order implicit method. The Zou–He boundary conditions were employed at both inlet and outlet boundaries, and bounce-back/specular reflection distribution functions were applied to the impermeable walls. The non-equilibrium distribution functions were also used as the inlet temperature boundary condition. A fully developed temperature profile was considered at the microchannel outlet. A pressure ratio of 2 was considered in the simulations, and various parameters such as dimensionless pressure, pressure deviation from the linear pressure, dimensionless velocity at various Knudsen numbers, centerline velocity and slip velocity of the fluid, centerline temperature and fluid temperature on the wall, Nusselt number with changing Knudsen and Prandtl numbers, parameter k along the microchannel length and Cf·Re values were evaluated in the slip and transition flow regimes. The results of the direct simulation Monte Carlo were used to evaluate the correctness of the numerical model. The consistency of the two methods indicated the accuracy of the proposed method.
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Abbreviations
- B:
-
Molecular slip coefficient
- BBC:
-
Bounce-back
- BSR:
-
Bounce-back/specular reflection
- \(c\) :
-
Lattice speed (m s−1)
- \(C^{*}\) :
-
Temperature jump coefficient
- \(C_{\text{f}}\) :
-
Skin friction coefficient
- \(\varvec{c}_{\text{i}}\) :
-
Discrete velocity vectors (m s−1)
- \(c_{\text{s}}\) :
-
Sound speed (m s−1)
- \(\bar{c}\) :
-
Mean molecular velocity (m s−1)
- \(d\) :
-
Molecular diameter (m)
- DSMC:
-
Direct simulation Monte Carlo
- Ec:
-
Eckert number
- f :
-
Local distribution function (for fluid flow)
- g :
-
Local distribution function (for thermal fluid flow)
- H :
-
Height of the microchannel (m)
- Kn:
-
Knudsen number, Kn = λ/H
- lu:
-
Length unit
- \(L\) :
-
Length of the microchannel (m)
- LBM:
-
Lattice Boltzmann method
- Ma:
-
Mach number
- \(m\) :
-
Molecular mass (kg)
- mu:
-
Mass unit
- \({\text{Nu}}\) :
-
Nusselt number
- \(P\) :
-
Pressure (\({\text{N}}\, {\text{m}}^{ - 2}\))
- Pr:
-
Prandtl number
- R:
-
Gas constant (\({\text{J}}\, {\text{K}}^{ - 1} \, {\text{mol}}^{ - 1}\))
- SRT:
-
Single relaxation time
- \(r\) :
-
Bounce-back fraction parameter
- Re:
-
Reynolds number
- T:
-
Temperature (K)
- \(T^{*}\) :
-
Non-dimensional temperature
- \(T_{\text{B}}\) :
-
Bulk temperature (K)
- \(T^{\text{jump}}\) :
-
Temperature jump (K)
- \(T_{\text{mean}}\) :
-
Mean temperature (K)
- t :
-
Time (s)
- TRT:
-
Two relaxation times
- tu:
-
Time unit
- Tu:
-
Temperature unit
- \(U^{*}\) :
-
Non-dimensional velocity
- \(U_{\text{mean}}\) :
-
Mean velocity (m s−1)
- \(U_{\text{s}}\) :
-
Slip velocity (m s−1)
- V :
-
Velocity vector (m s−1)
- X :
-
Particle location at x-direction (m)
- X*:
-
Non-dimensional parameter at x-direction
- Y :
-
Particle location at y-direction (m)
- Y*:
-
Non-dimensional parameter at y-direction
- α:
-
Thermal diffusivity (m2 s−1)
- \(\delta t\) :
-
Time step (s)
- \(\delta x\) :
-
Step by step (m)
- \(\lambda\) :
-
Molecular mean free path (m)
- µ :
-
Dynamic viscosity (\({\text{N}}\,{\text{s}} \,{\text{m}}^{ - 2}\))
- \(v\) :
-
Kinematic viscosity (m2 s−1)
- \(\varPi\) :
-
Pressure ratio
- \(\rho\) :
-
Density (kg m−3)
- \(\sigma\) :
-
TMAC coefficient
- \(\tau_{\text{a}}\) :
-
Antisymmetric relaxation time (based on slip boundary)
- \(\tau_{\text{f}}\) :
-
Symmetric relaxation time for fluid flow
- \(\tau_{\text{g}}\) :
-
Symmetric relaxation time for thermal fluid flow
- \(\tau_{\text{s}}\) :
-
Symmetric relaxation time (based on viscosity)
- \(\varOmega\) :
-
Collision operator
- \(\omega_{\text{i}}\) :
-
Mass factors
- a:
-
Antisymmetric
- aeq:
-
Antisymmetric equilibrium
- e:
-
Effective
- eq:
-
Equilibrium
- i:
-
Discrete lattice directions
- in:
-
Inlet
- l:
-
Linear
- out:
-
Outlet
- s:
-
Symmetric
- seq:
-
Symmetric equilibrium
- w:
-
Wall
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Kamali Ahangar, E., Izanlu, M., Dolati Khakhian, S. et al. Modified lattice Boltzmann solution for non-isothermal rarefied gas flow through microchannel utilizing BSR and second-order implicit schemes. J Therm Anal Calorim 144, 2525–2541 (2021). https://doi.org/10.1007/s10973-020-10129-8
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DOI: https://doi.org/10.1007/s10973-020-10129-8