Jump to content

Forced convection in porous media

From Wikipedia, the free encyclopedia

Forced convection is type of heat transport in which fluid motion is generated by an external source like a (pump, fan, suction device, etc.). Heat transfer through porus media is very effective and efficiently. Forced convection heat transfer in a confined porous medium has been a subject of intensive studies during the last decades because of its wide applications.

The basic problem in heat convection through porous media consists of predicting the heat transfer rate between a deferentially heated, solid impermeable surface and a fluid-saturated porous medium. Beginning with constant wall temperature.[1]

In 2D steady state system

According to Darcy's law

is the thickness of the slender layer of length x that affects the temperature transition from to .

Balancing the energy equation between enthalpy flow in the x direction and thermal diffusion in the y direction

boundary is slender so

The Peclet number is a dimensionless number used in calculations involving convective heat transfer. It is the ratio of the thermal energy convected to the fluid to the thermal energy conducted within the fluid.

Advective transport rate Diffusive transport rate

See also

[edit]

References

[edit]
  1. ^ Nield, D.A; Bejan, A (2013). Convection in Porous Media. Springer Science & Business Media. ISBN 9780387290966.
[edit]