Free Convection: Cylinders, Spheres, and Enclosures. Chapter 9 Section 9.6.3 through 9.8. The Long Horizontal Cylinder. Cylinders. Boundary Layer Development and Variation of the Local Nusselt Number for a Heated Cylinder:. The Average Nusselt Number:.
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Section 9.6.3 through 9.8
for a Heated Cylinder:
remaining walls well insulated.
Fluid layer is thermally stable.
Thermal instability yields a regular convection pattern in the form of roll cells.
Buoyancy drive flow is turbulent
A primary cellular flow is established, as the core
becomes progressively more quiescent, and
secondary (corner) cells develop with increasingEnclosures (cont)
Fluid layer is unconditionally stable.
whose value depends on H/L (Table 9.4).
Rayleigh number of
Annular Cavities critical angle ,Enclosures (cont)
Problem 9.74: Use of saturated steam to heat a pharmaceutical in a batch reactor.