首页> 外文期刊>International Journal of Heat and Mass Transfer >Transient natural convective heat transfer of a low-Prandtl-number fluid from a heated horizontal circular cylinder to its coaxial triangular enclosure
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Transient natural convective heat transfer of a low-Prandtl-number fluid from a heated horizontal circular cylinder to its coaxial triangular enclosure

机译:低数流体从加热的水平圆柱体到其同轴三角形外壳的瞬态自然对流换热

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摘要

Transient natural convective heat transfer of liquid gallium, which has a Prandtl number of 0.023 at 310 K, from a heated horizontal circular cylinder to its coaxial triangular enclosure is studied numerically by employing the control volume method. Two orientations of the triangular cylinder are investigated and the Grashof number is varied from 10~4 to 10~7. Development of natural convection is presented by means of the evolutions of the average Nusselt number over the outer triangular wall. Temporal stages during the course of development are identified and demonstrated through representative snapshots of streamlines and isotherms. The time-averaged Nusselt number is scaled with Grashof number for both conduction- and convection-dominated regimes. It is found that by placing horizontally the top side of the triangular cylinder, the convective flow becomes more stable and the overall heat transfer is enhanced. In addition, pitchfork bifurcation is explored quantitatively and its onset times are predicted as well.
机译:液态镓从加热的水平圆柱体到其同轴三角形外壳的瞬态自然对流传热,在310 K时的Prandtl值为0.023,采用控制体积法进行了数值研究。研究了三角形圆柱体的两个方向,Grashof数在10〜4到10〜7之间变化。自然对流的发展是通过外三角壁上平均努塞尔数的演变来表示的。通过流线型和等温线的代表性快照,可以确定并演示开发过程中的时间阶段。对于传导和对流占主导地位的方案,时间平均Nusselt数与Grashof数成比例。已经发现,通过水平放置三角形圆柱体的顶侧,对流变得更稳定,并且总的热传递得到增强。此外,对干草叉分叉进行了定量研究,并预测了其发作时间。

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