摘要
从Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程和能量方程入手，利用有限差分方法摸拟绕水平圆柱定常层流自然对流流动，采用流函数涡量无量纲方程，非均匀网格剖分，二阶精度差分格式，非均匀圆柱表面温度分布，计算了瑞利数Ｒａ在１０４～１０６，普朗特数Ｐｒ在０．７～１００范围内的各种非均匀表面温度分布下的绕水平圆柱自然对流，特别是在圆往表面温度局部低于室温情况下，计算出了回流。全部结果与实际情况及已有的实验计算结果吻合。
The heat transfer for laminar natural convection around a horizontal circular cylinderfrequently found in engineering practice is investigated.Afinite difference method has beenused to find a solution for two-dimensional stationary natural convection around a circularcylinder submerged in an unbounded Boussinesq fluid.Numerical simulations have been car-ried out for nonuniform temperature and uniform temperature distributions over the cylindri-cal surface and for l04≤Ra≤106 and 0.7≤Pr≤100,especially for the recirculation flow oc-curring when part of thc cylinder is at a temperature below the ambient.All results arefound to be in agreement with existing experimental data available.
出处
《华中理工大学学报》
CSCD
北大核心
1994年第1X期161-164,共4页
Journal of Huazhong University of Science and Technology
关键词
自然对流
水平圆柱
传热
数值模拟
N-S方程
natural convection
horizontal cylinder
heat transfer
numerical computation
