pezarello86
Guest
Bye to all,
I would like to expose a problem a case that I'm analyzing in fluent and I haven't found a paper yet or someone who confirms what I'm doing.
the problem to analyze is the natural convection of a pipe immersed in water copn the following conditions:
- water stops at 4 °c;
- temperature of the constant tube wall at -2°c;
the objective is to remain the coefficient of natural convection because on this depends the possibility that it is formed or not ice on the tube; the sfiga wants that all the paper and literature in general have never considered this range of fearprature so particular, I refer to the variation of the curve of the density of the water before the 4 °c. using the grashof and the rayleigh should be in transition regime from laminare to turbulent and for this I have made several tests both with laminary cases and with models of turbulence (keplus rmega, komegast). the results, except the laminar case, are not very different but the big difference is with the formula found in literature for a horizontal cylinder. Could someone help me? Thank you.
I would like to expose a problem a case that I'm analyzing in fluent and I haven't found a paper yet or someone who confirms what I'm doing.
the problem to analyze is the natural convection of a pipe immersed in water copn the following conditions:
- water stops at 4 °c;
- temperature of the constant tube wall at -2°c;
the objective is to remain the coefficient of natural convection because on this depends the possibility that it is formed or not ice on the tube; the sfiga wants that all the paper and literature in general have never considered this range of fearprature so particular, I refer to the variation of the curve of the density of the water before the 4 °c. using the grashof and the rayleigh should be in transition regime from laminare to turbulent and for this I have made several tests both with laminary cases and with models of turbulence (keplus rmega, komegast). the results, except the laminar case, are not very different but the big difference is with the formula found in literature for a horizontal cylinder. Could someone help me? Thank you.