Abstract
In this work, it is proposed the direct and inverse analyses of the forced convection of an incompressible gas flow within rectangular channels in the range of the slip flow regime by taking into account the wall conjugation and the axial conduction effects. The Generalized Integral Transform Technique (GITT) combined with the single-domain reformulation strategy is employed in the direct problem solution of the three-dimensional steady forced convection formulation. A non-classical eigenvalue problem that automatically accounts for the longitudinal diffusion operator is here proposed. The Bayesian framework implemented with the maximum a posteriori objective function is used in the formulation of the inverse problem, whose main objective is to estimate the temperature jump coefficient, the velocity slip coefficient, and the Biot number, using only external temperature measurements, as obtained, for instance, with an infrared measurement system. A comprehensive numerical investigation of possible experimental setups is performed in order to verify the influence of the Biot number, wall thickness, and Knudsen number on the precision of the unknown parameters estimation.
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Abbreviations
- \({\mathrm{Bi}}\) :
-
Biot number
- \(CI_{i}\) :
-
Relative measure of the confidence interval of the estimated value \(\hat{P}_i\)
- \(D_h\) :
-
Hydraulic diameter
- \(h_e\) :
-
Convective heat transfer coefficient
- \(\mathbf {J}\) :
-
Jacobian matrix
- \(\mathcal {J}\) :
-
Scaled sensitivity coefficients
- k :
-
Thermal conductivity
- K :
-
Dimensionless thermal conductivity
- \({\mathrm{Kn}}\) :
-
Knudsen number
- \(L_x\) :
-
Distance from the channel centerline to the external face of the channel wall (x direction)
- \(L_y\) :
-
Distance from the channel centerline to the external face of the channel wall (y direction)
- M :
-
Truncation order of the eigenfunction expansion (eigenvalue problem solution)
- N :
-
Truncation order of the temperature eigenfunction expansion
- n :
-
Norm of the eigenfunction \(\psi (X,Y)\)
- \(N_p\) :
-
Dimension of the vector \(\mathbf {P}\)
- \(N_d\) :
-
Dimension of the vector \(\mathbf {Y}\)
- \(\mathbf {n}\) :
-
Outward-drawn normal vector
- \(\mathbf {P}\) :
-
Vector of parameters
- \(\mathbf {P}_{\mathrm{exact}}\) :
-
Vector with the exact values of the sought parameters
- \({\mathrm{Pe}}\) :
-
Péclet number
- \({\mathrm{Pr}}\) :
-
Prandtl number
- \({\mathrm{Re}}\) :
-
Reynolds number
- S :
-
Objective function
- T :
-
Temperature
- \(T_\infty \) :
-
Ambient temperature
- u :
-
Fully developed flow velocity
- U :
-
Dimensionless flow velocity
- \(\mathbf {V}\) :
-
Covariance matrix of the prior information
- \(\mathbf {W}\) :
-
Covariance matrix of the experimental errors
- y :
-
Transversal coordinate
- X, Y :
-
Dimensionless transversal coordinates
- \(\mathbf {Y}\) :
-
Vector of temperature measurements
- z :
-
Longitudinal coordinate
- Z :
-
Dimensionless longitudinal coordinate
- \(Z_f\) :
-
Dimensionless channel length
- \(\alpha _f\) :
-
Thermal diffusivity of the fluid
- \(\alpha _m\) :
-
Tangential momentum accommodation coefficient
- \(\alpha _t\) :
-
Thermal accommodation coefficient
- \(\beta \) :
-
General temperature jump coefficient in the 3D formulation
- \(\beta _t\) :
-
Wall temperature jump coefficient
- \(\beta _v\) :
-
Wall velocity slip coefficient
- \(\epsilon _{\mathrm{fic}}\) :
-
Dimensionless thickness of the fictitious layer
- \(\gamma \) :
-
Specific heat ratio
- \(\lambda \) :
-
Molecular mean free path
- \(\Omega \) :
-
Auxiliary eigenfunctions
- \(\omega \) :
-
Eigenvalue corresponding to the eigenfunction \(\Omega \)
- \(\psi \) :
-
Temperature eigenfunctions
- \(\eta \) :
-
Eigenvalue corresponding to the eigenfunction \(\psi \)
- \({\varvec{\mu }}\) :
-
Mean vector of the prior density
- \(\pi \) :
-
Probability density function
- \(\sigma _e\) :
-
Standard deviation of the experimental errors
- \(\sigma _{P_{i}}\) :
-
Standard deviation of the estimated parameter \(P_i\)
- \(\theta \) :
-
Dimensionless temperature
- \(\nu \) :
-
Kinematic viscosity
- \({\mathrm{ac}}\) :
-
Quantity corresponding to the axial conduction term
- \({\mathrm{av}}\) :
-
Average
- \({\mathrm{f}}\) :
-
Fluid flow region
- \({\mathrm{fic}}\) :
-
Quantity corresponding to the fictitious layer
- \({\mathrm{in}}\) :
-
Quantity corresponding to the entrance of the channel
- \({\mathrm{int}}\) :
-
Interface position
- i, j, m, n :
-
Indices
- \({\mathrm{s}}\) :
-
Solid region (channel walls)
- \({\mathrm{w}}\) :
-
Quantity corresponding to the external face of the channel wall
- X :
-
Quantity corresponding to the X direction
- Y :
-
Quantity corresponding to the Y direction
- \(^{*}\) :
-
Domain including the fictitious layer
- \(\hat{}\) :
-
Estimated value
- \(+\) :
-
Upper bound of the confidence interval
- −:
-
Lower bound of the confidence interval
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Acknowledgements
This study was financed in part by CAPES—Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil, Finance Code 001. The authors would also like to thank the other sponsoring agencies, CNPq—Conselho Nacional de Desenvolvimento Científico e Tecnológico, and FAPERJ—Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro.
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Silva, G.R., Knupp, D.C., Naveira-Cotta, C.P. et al. Estimation of slip flow parameters in microscale conjugated heat transfer problems. J Braz. Soc. Mech. Sci. Eng. 42, 263 (2020). https://doi.org/10.1007/s40430-020-02328-z
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DOI: https://doi.org/10.1007/s40430-020-02328-z