Heat transfer investigation in a three dimensional annulus made of laminated composite Aluminum hexadecane and filled with porous media

الملخص EN

Cp: Specific heat at constant pressure (kJ/kg oC), g: Acceleration due to gravity (m/s2), kf: Thermal conductivity of the fluid (W/m K), ks: Thermal conductivity of the solid (W/m K), keff.: Effective thermal conductivity of the porous media (W/m K), K: Permeability (m2), l: Cylinder length (m), L:Dimensionless cylinder length, Nu1: Local Nusselt number on the inner cylinder, Nu2: Local Nusselt number on the outer cylinder, Nuin: Average Nusselt number on the inner cylinder, Nuout: Average Nusselt number on the outer cylinder, p: Pressure (N/m2), q: Local heat flux (m), r: Radial coordinate (m), R: Dimensionless radial coordinate, Ra*: Modified Rayleigh number, Rr: Radius ratio, S: Fin pitch (m), T: Temperature (K), t: time (s), ur, uϕ, uz: velocity component in r, ϕ and z - direction (m/s), Ur, Uϕ, Uz: Dimensionless velocity component in R, ϕ and Z direction, x, y, z: Cartesian coordinate system (m), Z: Dimensionless axial coordinate, α: Thermal diffusivity (m2/s), β: Volumetric thermal expansion coefficient (1/K), θ: Dimensionless temperature, ψr, ψϕ, ψz: Vector potential component in R,ϕ and Z – direction, FAI: angular direction.