Nusselt number outside, equations

Equations for Outside Nusselt Number [(ARe)c < 1] Rigid-Drop Model... 

Fig. 1. Comparison of equations for outside Nusselt number (cf. Table I).

If the wall is inclined at an angle 7 to the vertical then the acceleration due to gravity g has to be replaced by its component parallel to the wall g cos 7 with 0 < 7 < 7r/2. The equation also holds for condensation of quiescent vapours on the inside or outside of a vertical tube, if the diameter of the tube is large in comparison to the film thickness. The width b has to be replaced by b = ir d. If a deviation of 1 % from the values from Nusselt s film condensation theory is permitted, then the equation is valid up to a Reynolds number... 

The tube outside diameter should be used in formulating the Nusselt and Reynolds numbers in this equation, not the equivalent diameter (24). In entrance or exit areas where axial flow over tubes applies, the same equation is often used, but with the constant equal to 0.106. 

---

See also in sourсe #XX -- [ ]

---