Steady and Unsteady Heat Transfer in a Channel Partially Filled with Porous Media Under Thermal Non-Equilibrium Condition

Steady and pulsatile flow and heat transfer in a channel lined with two porous
layers subject to constant wall heat flux under local thermal non-equilibrium (LTNE) condition
is numerically investigated. To do this, a physical boundary condition in the interface of
porous media and clear region of the channel is derived. The objective of this work is, first,
to assess the effects of local solid-to-fluid heat transfer (a criterion indicating on departure
from local thermal equilibrium (LTE) condition), solid-to-fluid thermal conductivity ratio
and porous layer thickness on convective heat transfer in steady condition inside a channel
partially filled with porous media; second, to examine the impact of pulsatile flow on heat
transfer in the same channel. The effects of LTNE condition and thermal conductivity ratio in
pulsatile flow are also briefly discussed. It is observed that Nusselt number inside the channel
increases when the problem is tending to LTE condition. Therefore, careless consideration
of LTE may lead to overestimation of heat transfer. Solid-to-fluid thermal conductivity ratio
is also shown to enhance heat transfer in constant porous media thickness. ... mehrIt is also revealed
that an increase in the amplitude of pulsation may result in enhancement of Nusselt number,
while Nusselt number has a minimum in a certain frequency for each value of amplitude.