Heat transfer phenomenon plays an important role in most industrial issues. Therefore,
methods of improving heat transfer for the optimal use of energy resources are very
important. In the last two decades, the use of porous materials in heat exchangers as a
passive method of improving heat transfer has been seriously discussed due to its
characteristics such as increasing the surface area per unit volume. In the first part of
this thesis, the fluid flow and heat transfer from a Full porous circular cylinder under
forced vibration in a cross-flow are simulated using Ansys-Fluent software. The effect
of Darcy number, reduced frequency, vibration amplitude and Reynolds number on the
hydrodynamic and thermal characteristics of the cylinder has been studied. The results
showed that for a small range of Darcy numbers, in large amount of frequency and
amplitude of oscillation, that vortex shedding phenomenon may occur which causes an
increase the heat transfer rate. While in Darcy numbers there is no vortex shedding
phenomenon and instead combining the high penetration of flow with flow fluctuations
improves the heat transfer rate.
One of the types of porous heat exchangers is the shell-tube heat exchangers, which uses
a porous coating on the outer surface of the tubes. In shell-tube heat exchangers, the
vortex shedding phenomena occurs at certain Reynolds number, shedding vortices exert
periodic forces on the tube that causes it to oscillate, so-called vortex induced vibration.
In order to more accurately predict the pressure drop and heat transfer coefficient
obtained from the numerical simulation of heat exchangers, this vibrational motion of
the tubes must be taken into account. In the second part of the thesis, fluid flow and heat
transfer from a cylinder with a porous coating under vortex-induced vibrations are
investigated. The vibrational motion of the cylinder is modeled by a mass spring
damping system using ANSYS-FUENT software. The effect of parameters such as