首页> 外文期刊>International Journal of Heat and Mass Transfer >Transient natural convective heat transfer of a low-Prandtl-number fluid inside a horizontal circular cylinder with an inner coaxial triangular cylinder
【24h】

Transient natural convective heat transfer of a low-Prandtl-number fluid inside a horizontal circular cylinder with an inner coaxial triangular cylinder

机译:具有内部同轴三角圆柱体的水平圆柱体内的低普朗特数流体的瞬态自然对流换热

获取原文
获取原文并翻译 | 示例
           

摘要

A numerical study of transient natural convection of liquid gallium (Pr = 0.023) from a horizontal triangular cylinder to its coaxial cylindrical enclosure is performed. The aspect ratio is fixed at 2 and two positions of the inner triangular cylinder are considered. The development of the convective flow and heat transfer is shown via the time histories of the average Nusselt number over the outer circular wall for various Grashof numbers. Temporal phases of the flow development are identified as: initializing, developing, transitioning, and steady/quasi-steady state or oscillating. Typical flow patterns and temperature distributions at these phases are presented by means of streamlines and isotherms, respectively. Pitchfork bifurcation is present for both positions of the inner triangular cylinder when Gr ≥ 5 × 10~4. The time-averaged Nusselt number over the outer circular cylinder, the flow development time, and the onset time of pitchfork bifurcation are predicted and scaled with the Grashof number. It is found that the time-averaged Nusselt number is apparently increased by horizontally placing the top side of the inner triangular cylinder for Gr ≥ 1 × 10~5.
机译:进行了液态镓(Pr = 0.023)从水平三角形圆柱体到其同轴圆柱体外壳的瞬态自然对流的数值研究。长宽比固定为2,并考虑内部三角圆柱的两个位置。对流流动和传热的发展通过各种格拉斯霍夫数在外圆壁上的平均努塞尔数的时间历程来显示。流动发展的时间阶段被标识为:初始化,发展,转变以及稳态/准稳态或振荡。这些阶段的典型流型和温度分布分别通过流线和等温线表示。当Gr≥5×10〜4时,内部三角形圆柱体的两个位置都存在干草叉分叉。预测了外圆柱上的平均Nusselt数,流动发展时间和干草叉分叉的开始时间,并用Grashof数进行缩放。结果发现,当Gr≥1×10〜5时,通过水平放置内三角圆柱体的顶侧,可以明显提高时均Nusselt数。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号