BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI
buletinul institutului politehnic din iaşi - Universitatea Tehnică ...
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80 Gelu Coman and Valeriu Damian<br />
mathematical solution to the problem are made difficult by the fact that general<br />
solutions relate to three-dimensional nonstationary temperature fields in bodies<br />
whose physical properties are temperature dependent.<br />
2. Problem Formulation<br />
Numerical modeling was performed using Fluent 6.3 software for two<br />
cases of skating track construction, namely: track with water immersed pipeline<br />
and track with pipes buried in sand. For symmetry purpose the study was<br />
conducted using a flat discretization network, bordered left and right by two<br />
vertical lines passing through the mid distance between two consecutive tubes, a<br />
straight horizontal line representing the water (or ice) surface and another one<br />
that represents the track foundation board (Fig. 1).<br />
With the water submerged pipe geometry , the calculation range is identically<br />
bounded, specifying that the entire area around the pipe was considered of<br />
liquid type .<br />
The grid with the water submerged pipe geometry contains 13563 nodes<br />
and 12952 quadrilateral elements, and in the second case ,with the pipe buried<br />
in the sand, 11243 nodes and 10896 elements.<br />
The Fluent program has an impressive library of solid and fluid materials<br />
and their properties. Numerical modeling of heat transfer with phase change<br />
made with this software, physically corresponds to the real solidification<br />
process around the cylindrical surfaces. Thus, the thermophysical properties of<br />
materials are no longer constant but vary with temperature and the phase<br />
change is not isothermal<br />
Water<br />
surface<br />
Sand<br />
surface<br />
Pipe<br />
surface<br />
Track<br />
foundation<br />
board<br />
surface<br />
Fig.1 – The surfaces of the analyzed domain.