Abstract
The present study is intended to study heat and mass transfer in a vertical annular cylinder embedded with saturated porous medium. The inner surface of cylinder is maintained at uniform wall temperature and uniform wall concentration. The governing partial differential equations are non-dimensionalised and solved by using finite element method (FEM). The porous medium is discritised using triangular elements with uneven element size. Large number of smaller-sized elements are placed near the walls of the annulus to capture the smallest variation in solution parameters. The results are reported for both aiding and opposing flows. The effects of various non-dimensional numbers such as buoyancy ratio, Lewis number, Rayleigh number, aspect ratio, etc on heat and mass transfer are discussed. The temperature and concentration profiles are presented.
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Abbreviations
- A:
-
Area of an element
- A r :
-
Aspect ratio
- C p :
-
Specific heat
- \({C,\bar{{C}}}\) :
-
Species concentration (dimensional and non-dimensional, respectively)
- D :
-
Mass diffusivity
- g :
-
Gravitational acceleration
- H :
-
Height of cylinder
- k :
-
Thermal conductivity
- K :
-
Permeability of porous media
- L :
-
= r o − r i
- Le :
-
Lewis number
- M :
-
Shape function
- n :
-
Refractive index
- N :
-
Buoyancy ratio
- \({Nu_{z } ,\bar{{N}}u}\) :
-
Local and average Nusselt number
- p :
-
Pressure
- q r :
-
Radiation flux
- r, z :
-
Cylindrical coordinates
- \({\bar{r}, \bar{z}}\) :
-
Non-dimensional coordinates
- \({\bar{{R}}}\) :
-
Mean radial distance of an element
- R :
-
Radius ratio
- Ra :
-
Rayleigh number
- Rd :
-
Radiation parameter
- \({Sh_z ,\bar{S}h}\) :
-
Local and average Sherwood number
- \({T, \bar{T}}\) :
-
Dimensional and non-dimensional temperature, respectively
- u, w :
-
Velocity in r and z directions
- α :
-
Thermal diffusivity
- β C :
-
Coefficient of concentration expansion
- β T :
-
Coefficient of thermal expansion
- β R :
-
Rosseland extinction coefficient
- ρ :
-
Density
- v :
-
Coefficient of kinematic viscosity
- μ :
-
Coefficient of dynamic viscosity
- σ :
-
Stefan Boltzmann’s constant
- ψ :
-
Stream function
- \({\bar{{\psi }}}\) :
-
Non-dimensional stream function
- w :
-
Wall
- ∞:
-
Conditions at infinity
- i :
-
Inner
- o :
-
Outer
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Badruddin, I.A., Salman Ahmed, N.J., Al-Rashed, A.A.A.A. et al. Analysis of Heat and Mass Transfer in a Vertical Annular Porous Cylinder Using FEM. Transp Porous Med 91, 697–715 (2012). https://doi.org/10.1007/s11242-011-9867-x
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DOI: https://doi.org/10.1007/s11242-011-9867-x