温度差の大きい閉空間における熱対流

概要

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The Boussinesq approximation has been commonly used to analyze thermally driven flows in enclosures. However, its validity is limited to the case of small temperature difference. As temperature difference increases, the practical flow characteristics and instabilities show increasing differences from those obtained with the Boussinesq approximation. In the present study, we have proposed modified governing equations of thermal convection which can well represent the flow behavior in enclosures with relatively large temperature difference. Also, we have discussed How the flow pattern in a square cavity varies with increasing temperature difference and How the flow instability occurs, comparing the numerical results obtained using the Boussinesq-approximated and the exact governing equations.
一般社団法人日本機械学会の論文
1996-02-25