低雷诺数条件下超临界压力CO<sub>2</sub>换热实验研究

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名

邮箱

手机号码

标题

留言内容

验证码

低雷诺数条件下超临界压力CO₂换热实验研究

1. State Nuclear Power Technology R&D Centre, Beijing, 100190, China;
2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Educations, Tsinghua University, Beijing, 100084, China

摘要: 在低雷诺数条件下(Re_in=1970和750),对超临界压力CO₂在垂直圆管(d=2 mm)内向上流动和向下流动时的对流换热进行了实验研究。实验结果表明:当Re_in=1970时,在热流密度较高的情况下,在管子的入口处向上流动会出现局部壁面温度峰值和谷值,而在向下流动时未观察到此类似现象;当Re_in=750时,向上、向下流动壁面温度的变化趋势和换热规律类似。
- 超临界压力 /
- CO₂ /
- 低雷诺数 /
- 对流换热
Abstract: Convection heat transfer during upward flow of CO₂ at supercritical pressures in a vertical circular tube（d=2mm） at low Reynolds numbers ranged from 750 to 1 970 has been experimentally investi-gated.The results show that the local wall temperature decrease was observed in upward flow at low heat fluxes and the local wall temperature peak at high heat fluxes with upward flow for Re=1970 which were not observed.The trend of wall temperature and the regularity of heat transfer are similar for upward and down-ward flows.
- Supercritical pressure /
- CO₂ /
- Low Reynolds numbers /
- Convection heat transfer