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Titolo:
Transition to oscillatory natural convection of water near its density maximum in a tall enclosure - Assessment of three-dimensional effects
Autore:
Ho, CJ; Tu, FJ;
Indirizzi:
Natl Cheng Kung Univ, Dept Mech Engn, Tainan 70101, Taiwan Natl Cheng KungUniv Tainan Taiwan 70101 Mech Engn, Tainan 70101, Taiwan
Titolo Testata:
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
fascicolo: 7, volume: 11, anno: 2001,
pagine: 626 - 641
SICI:
0961-5539(2001)11:7<626:TTONCO>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
VERTICAL ENCLOSURE; RECTANGULAR CAVITY; RAYLEIGH NUMBERS; HEAT-TRANSFER; EXTREMUM; FLOW;
Keywords:
convection; simulation; water;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Ho, CJ Natl Cheng Kung Univ, Dept Mech Engn, Tainan 70101, Taiwan Natl Cheng Kung Univ Tainan Taiwan 70101 gn, Tainan 70101, Taiwan
Citazione:
C.J. Ho e F.J. Tu, "Transition to oscillatory natural convection of water near its density maximum in a tall enclosure - Assessment of three-dimensional effects", INT J N M H, 11(7), 2001, pp. 626-641

Abstract

Numerical simulations have been Performed for three-dimensional natural convection of water near its maximum-density (cold water) inside rectangular enclosures with differential heating at the vertical (left and right) walls. The horizontal (top and bottom) walls and the lateral (front and rear) wags are taken as insulated Computations are performed for the buoyancy-driven convection of cold water with density inversion parameter theta (m) = 0.5in the enclosures with aspect ratio (height/width) A(y) = 8 and depth ratios (depth/width) A(z) = 0.5, 1, and 2. The influence of the death ratio on the onset of oscillatory convection in a cold-water-filled enclosure is investigated. The presence of the lateral walls tends to suppress the onset ofunsteadiness in the convective flow. The main features of the oscillatory convection flow and temperature fields as well as the instability mechanismin the three-dimensional enclosure were similar to those found in the two-dimensional model. However, there exists a strong three-dimensionality in the spatial distribution of the fluctuation amplitude. With the decrease of the depth ratio, the damping effect of the lateral walls becomes increasingly Pronounced, leading to a reduced heat transfer rate.

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Documento generato il 04/07/20 alle ore 17:32:34