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U = \frac{\lambda_{ann}}{d_h} \, {\rm Nu}_h{ann} |
where
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The Nusselt number (Nu) correlations are:
displaystyle \frac%7B\nu%7D%7Ba%7D | |
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body | --uriencoded--%7B\rm Ra%7D |
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| Rayleigh number | | |
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| | thermal diffusivity |
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body | --uriencoded--r_%7Bout%7D |
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| inner radius of outer pipe |
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body | --uriencoded--r_%7Bin%7D |
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| outer radius of inner pipe |
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body | --uriencoded--\zeta = r_%7Bout%7D/r_%7Bin%7D |
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body | p = 1.013 \cdot\exp \left[ -0.067 \cdot \zeta \right] |
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body | --uriencoded--\displaystyle c = \frac%7B0.03 \, \zeta%5e%7B1.86%7D%7D%7B0.063 \, \zeta%5e3 -0.674 \, \zeta%5e2 +2.225 \, \zeta - 1.157 %7D |
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See also
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Physics / Thermodynamics / Heat Transfer / Heat Transfer Coefficient (HTC) / Heat Transfer Coefficient (HTC) @model
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