A study of double-diffusive rollover in cylinder enclosures
Book
·
OSTI ID:458422
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Mechanical Engineering and Applied Mechanics
- Univ. of Tokyo (Japan). Inst. of Industrial Science
The spontaneous destabilization of stably-stratified fluids due to the reversal of the density gradient, caused by heat and/or mass transfer, sometimes in conjunction with evaporation, is known as rollover. This phenomenon occurs in nature and in industrial processes, best known in the storage of liquefied natural gas (LNG). This study models the process by numerically solving the transient momentum, energy, and mass transfer equations for a binary solution in a cylindrical enclosure. Initially the fluid is stably stratified, with the upper layer having a higher concentration of the lighter component. Heating through the walls is then applied, resulting in buoyancy-driven convection accompanied by heat and mass transfer, and often finally in rollover. Computations are performed for a Prandtl number of 390. Schmidt number of 5500 and for the range of modified thermal Rayleigh numbers. As expected, the tendency to rollover increases with increasing modified thermal Rayleigh number and decreases with increasing solutal Rayleigh number.. The most important mechanism which triggers rollover is buoyancy-driven penetration of the lower liquid into the upper layer along the heated side wall. The basic phenomena in the cylindrical and rectangular enclosures were found to be similar, but the interface descent velocity and the intensity of mixing in the cylindrical enclosure are higher, resulting in somewhat different times to onset of rollover.
- OSTI ID:
- 458422
- Report Number(s):
- CONF-951135--; ISBN 0-7918-1751-2
- Country of Publication:
- United States
- Language:
- English
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