| 变物性条件下管内加速流时湍流换热与流动过程的数值模拟 |
| |
| 引用本文： | 陈雷,姜培学,E·P·瓦卢耶娃. 变物性条件下管内加速流时湍流换热与流动过程的数值模拟[J]. 工程热物理学报, 2003, 24(5): 821-824 |
| |
| 作者姓名： | 陈雷 姜培学 E·P·瓦卢耶娃 |
| |
| 作者单位： | 1. 清华大学热能工程系,北京,100084
2. 莫斯科动力学院,俄罗斯,莫斯科,111250 |
| |
| 摘 要： | 对圆管内变物性流体在加速流时考虑了非定常流的影响,采用新的湍流迁移模型,对换热过程和流动特性进行了数值模拟研究。与实验相比较,得到较一致的结果。模拟计算在很大的参量范围内进行,结果标明:努谢尔特数及阻力系数与其准静态时的量值的比值在所定义的无量纲特征时间上有一最小值;在加速流时变物性的影响是导致不稳定过程加大的因素。
|
| 关 键 词： | 非定常湍流 变物性 对流换热 圆管 数值模拟 |
| 文章编号： | 0253-231X(2003)05-0821-04 |
| 修稿时间： | 2002-12-11 |
NUMERICAL STUDY ON TURBULENT CONVECTION HEAT TRANSFER AND HYDRODYNAMICAL PROCESSES IN A TUBE WITH VARIABLE PROPERTIES AND INCREASING FLOW RATE |
| |
| CHEN Lei JIANG Pei-Xue VALUEVA E P. NUMERICAL STUDY ON TURBULENT CONVECTION HEAT TRANSFER AND HYDRODYNAMICAL PROCESSES IN A TUBE WITH VARIABLE PROPERTIES AND INCREASING FLOW RATE[J]. Journal of Engineering Thermophysics, 2003, 24(5): 821-824 |
| |
| Authors: | CHEN Lei JIANG Pei-Xue VALUEVA E P |
| |
| Abstract: | The influence of variable thermophysical properties on the turbulent convection heat transfer with monotonously time-increasing mass flux in a tube was investigated numerically. The turbulent transfer model was based on the equation of eddy shear stress and unstability. The numerical calculations were compared with experiments. The calculation was made in a very large range of parameters. It is shown that there are minimum values of (?)quasi-st and Nu/Nuquasi-st varing with times. It is also shown that variable properties increase the transient effects. |
| |
| Keywords: | unstable turbulence variable properties convection heat transfer tube numerical simulation |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
