Hi @ all,
i want to simulate the cooling behavior of liquid aluminum in a vertical cylinder(simplified geometry of a real transport crucible), the cylinder is cooled down by the surrounding air from all sides, from top and from buttom, i expect free convection in the liquid
to simulate this i have to decide between laminar or tubulent solvers.
i want to decide this by the rayleigh numer Ra>10^9 =turbulent
but i have a problem, i have lots of literature for the convection !!!around!!! a cylinder but zero for the convection !!!inside!!! a vertical cylinder,
so what is the characteristic length for the rayleigh number !!!inside!!!! an vertical cylinder? the diameter or height? do i have to take into account the top and the buttom if yes how?
the correlation equation for D/L>=35/Gr^(1/4) is valid by the way,
if you know a relation/ literature for the nusselt number in this situation, it would be helpful
thx @ all any kind of help is welcome
i want to simulate the cooling behavior of liquid aluminum in a vertical cylinder(simplified geometry of a real transport crucible), the cylinder is cooled down by the surrounding air from all sides, from top and from buttom, i expect free convection in the liquid
to simulate this i have to decide between laminar or tubulent solvers.
i want to decide this by the rayleigh numer Ra>10^9 =turbulent
but i have a problem, i have lots of literature for the convection !!!around!!! a cylinder but zero for the convection !!!inside!!! a vertical cylinder,
so what is the characteristic length for the rayleigh number !!!inside!!!! an vertical cylinder? the diameter or height? do i have to take into account the top and the buttom if yes how?
the correlation equation for D/L>=35/Gr^(1/4) is valid by the way,
if you know a relation/ literature for the nusselt number in this situation, it would be helpful
thx @ all any kind of help is welcome