...
In Natural Fluid Convection becomes dependant on Rayleigh number
and Prandtl number : LaTeX Math Inline |
---|
body | --uriencoded--\mbox%7BNu%7D = f (\mbox%7BRa%7D, \mbox%7BPr%7D) |
---|
|
.:
LaTeX Math Block |
---|
| \mbox{Nu}_D= \left[ 0.825 + \frac{0.387 \, \mbox{Ra}_D^{1/6}}{ \left[ 1+ (0.492/\mbox{Pr})^{9/16} \right]^{8/27}} \right]^2 |
| | All convection regimes in pipelines
LaTeX Math Inline |
---|
body | --uriencoded--\mbox%7BRa%7D_D \leq 10%5e%7B12%7D |
---|
|
|
LaTeX Math Block |
---|
| \mbox{Nu}_L= 0.68 + \frac{0.663 \, \mbox{Ra}^{1/4}}{ \left[ 1+ (0.492/\mbox{Pr})^{9/16} \right]^{4/9}} |
| | Laminar convection
LaTeX Math Inline |
---|
body | --uriencoded--\mbox%7BRa%7D \leq 10%5e9 |
---|
|
|
In case of natural convection in the annulus the Nusselt number becomes also dependant on the annulus geometry:
LaTeX Math Block |
---|
| {\rm Nu}_{ann} = \frac{2 \cdot \epsilon({\rm Ra})}{\ln (r_{out}/r_{in})} |
|
where
Forced Convection
...
In Forced Fluid Convection the Nusselt number becomes dependant on Reynolds number
and Prandtl number :
LaTeX Math Inline |
---|
body | --uriencoded--\mbox%7BNu%7D = f (\mbox%7BRe%7D, \mbox%7BPr%7D) |
---|
|
....