高レイリー数域における水平流体層の乱流自然対流(熱工学,内燃機関,動力など)

概要

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The fluid flow and heat transfer of the turbulent natural convection in a horizontal water layer, with heated from below, were investigated experimentally. The experiment was performed for the Rayleigh number Ra in the range of 1.5×10^5 up to 3.9×10^<10>. As Ra increases above 10^7, the circulating large-scale flow was gradually replaced by isolated rising and sinking plumes and then heat transfer was controlled by only those plumes. At Ra>10^9, a three-dimensional vortex in addition to those plumes was released from the thermal boundary layer. Consequently, this vortex appeared at high Rayleigh numbers seems to enhance the heat transfer process. For high Rayleigh numbers, the correlation between Ra and Nu is as follows: Nu=0.0930Ra^<0.326>(1.5×10^5<Ra<3.9×10^<10>).
社団法人日本機械学会の論文
2008-02-25