Transition to oscillatory natural convection of water near its density maximum in a tall enclosure: Assessment of three-dimensional effects

C. J. Ho, F. J. Tu

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10 引文 斯高帕斯(Scopus)

摘要

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) walls are taken as insulated. Computations are performed for the buoyancy-driven convection of cold water with density inversion parameter θm = 0.5 in the enclosures with aspect ratio (height/width) Ay = 8 and depth ratios (depth/width) Az = 0.5, 1, and 2. The influence of the depth 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 of unsteadiness in the convective flow. The main features of the oscillatory convection flow and temperature fields as well as the instability mechanism in 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.

原文English
頁(從 - 到)626-641
頁數16
期刊International Journal of Numerical Methods for Heat and Fluid Flow
11
發行號7
DOIs
出版狀態Published - 2001 10月 22

All Science Journal Classification (ASJC) codes

  • 材料力學
  • 機械工業
  • 電腦科學應用
  • 應用數學

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