The term conjugate heat transfer
is used to describe processes which involve variations of temperature within
solids and fluids, due to thermal interaction between the solids and fluids [1].
There are three kind of processes happen in conjugate heat transfer such as
convection, conduction then convection again.
A simulation using CDFSOF for
conjugate heat transfer has been performed, with file case from Mr. Ahmad
Indra, specially for case that usually happens in nuclear plant. You can see
the real case by seeing the following figure.
The grid is shown by the following picture.
From the grid, you can see that
there are two parallel tubes crossed by a certain fluids from the left
(according to the reader). We can do the simulation just by performing the half
of the tubes. We can see the “grid permukaan” to know where’s the inlet and outlet
by the following figure.
From figure above, we can see
that the inlet (as I mean above) is the left cells. The outlet is at the right
cells, while for the cells at top and bottom are symmetry and the rest is wall.
Result
The result is shown below. The
stream function graph is shown by following figure.
From the figure above, we can see
that there are vortexes between the tubes and behind the second tube. For heat
transfer, these vortexes can be useful to increase the heat transfer
coefficient.
The following figure is shown the
result for temperature distribution.
The blue color close to inlet is
the initial fluid temperature. As it moves, the temperature increases. The
highest value of fluid temperature is around and between the tubes. It’s due to
heat transfer from the tubes. So that the tubes has the highest temperature at its
center and the lowest at its circumference. The fluid moves to right and the
temperature decreases. It’s due to convection with the fluid close to the
bottom wall.
Ref.:
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