Transient Natural Convection of Water around a Cylinder in a Rectangular Cavity. Effect of the Density Inversion on Cooling of Water.

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  • 矩形容器内に置かれた円筒回りの水の非定常自然対流　水の冷却過程に及ぼす密度逆転の影響
  • クケイ ヨウキナイ ニ オカレタ エントウ マワリ ノ ミズ ノ ヒテイジョウ

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Abstract

Transient natural convection in water around a cooled horizontal cylinder placed at the center of a rectangular enclosure has been studied. The governing equations were solved by a finite difference method, and the flow structure and temperature distributions have been predicted. The purpose of the present study was to examine the effects of the density inversion of water and the initial temperature of water on the cooling process of water. The initial water temperature was varied 4, 6, 8 and 12°C, and the timewise variations of the temperature field and the velocity field as well as the mean and local Nusselt numbers on the cylinder surface were compared. The change in the initial water temperature largely affects fluid flows due to the density inversion of water. Complicated flow patterns are observed for initial water temperatures larger than 4°C. The cooling of water is most effective for an initial water temperature of 12°C.

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