Oscillatory phenomena of low-Prandtl-number fluids in a rectangular cavity

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Numerical Heat Transfer. Part A, Applications

DOI:https://doi.org/10.1080/10407789608913849· OSTI ID:417941

Kamakura, Katsuyoshi ^[1]; Ozoe, Hiroyuki ^[2]

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1. Toyama National Coll. of Technology (Japan)
2. Kyushu Univ., Kasuga (Japan). Inst. of Advanced Material Study

The oscillatory phenomena in natural convection of low-Prandtl-number fluids were studied numerically in a rectangular cavity with horizontal temperature gradient at Prandtl number Pr = 0.01, aspect ratio A = 1, 2, or 4, and Rayleigh number Ra = 10{sup 4}, 10{sup 5}, or 10{sup 6}. In the case of A = 1 a main strong round roll cell was formed at Ra = 10{sup 4}. However, at Ra = 10{sup 5} and 10{sup 6}, two secondary roll cells in the core of a main roll cell were formed and rotated around the center of the system. The flow was oscillating. In the case of A = 2, i.e., a taller regime, the shape of the main roll cell varied with time at and above Ra = 10{sup 4}, and then the secondary complicated weak roll cells were formed above and below the main roll cell. This resulted in oscillatory phenomena even at Ra = 10{sup 4}. In the case of A = 4, three main roll cells were formed. At Ra = 10{sup 5}, secondary roll cells were formed between the main roll cells and then oscillation of flow occurred.

• Sponsoring Organization: USDOE
• OSTI ID: 417941
• Journal Information: Numerical Heat Transfer. Part A, Applications, Journal Name: Numerical Heat Transfer. Part A, Applications Journal Issue: 5 Vol. 30; ISSN NHAAES; ISSN 1040-7782
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CAVITIES
FLUIDS
NATURAL CONVECTION
OSCILLATIONS
RECTANGULAR CONFIGURATION
SILICON