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