changes.mady.by.user Arthur Aslanyan (Nafta College)
Saved on Nov 25, 2019
...
\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
Churchill and Chu
All flow regimesregimes in pipelines
\mbox{Nu}_L= 0.68 + \frac{0.663 \, \mbox{Ra}^{1/4}}{ \left[ 1+ (0.492/\mbox{Pr})^{9/16} \right]^{4/9}}
Laminar flows
\mbox{Nu}_L= \left[ 0.6 + \frac{0.387 \, \mbox{Ra}^{1/6}}{ \left[ 1+ (0.559/\mbox{Pr})^{9/16} \right]^{8/27}} \right]^2
