球形燃料孔隙内汽泡生长与脱离Bubble Growth and Departure in Porous Media Composed of Spherical Fuel Elements
张晓杰,白博峰
摘要(Abstract)：
根据汽泡动力学原理及可视化试验结果,分别构建了球形燃料孔隙内的汽泡滑移和脱离模型,并对汽泡受力及传热进行分析,通过计算得到了汽泡滑移临界曲率半径、汽泡脱离半径的变化规律。汽泡滑移时的临界半径主要受颗粒大小影响,颗粒越大,汽泡的相对临界半径r_(cr)/R_p越小。颗粒半径对汽泡脱离半径的影响最大,颗粒半径越大,汽泡的相对脱离半径r_d/R_p越小。流速、压力、壁面过热度对汽泡脱离半径也有影响,其他条件相同时,流速越大,汽泡脱离半径越小;压力越大,汽泡脱离半径越大;壁面过热度越大,汽泡脱离半径越大。
关键词(KeyWords)： 球形燃料孔隙;汽泡;滑移;脱离
基金项目(Foundation):
作者(Author): 张晓杰,白博峰
参考文献(References)：
- [1]郭烈锦．两相与多相流动力学[M]．西安：西安交通大学出版社，2002:390-395.
- [2] Cooper M G,Lloyd A J P.The Microlayer in Nucleate Pool Boiling[J].Int.J.Heat Mass Transfer,1969,12:895-913
- [3] Chu W,Dhir V K,Marshall J.Study of Pressure Drop,Void Fraction and Relative Permeabilities of Two Phase Flow Through Porous Media[J].AIChE Symp.Series,1983,225(79):224-235.
- [4] Jamialahmadi M,Muller-Steinhagen H,Izadpanah M R.Pressure drop,gas hold-up and heat transfer during single and two-phase flow through porous media[J].Int.J.Heat and Fluid Flow,2005,26:156-172.
- [5]张晓杰，朱彦雷，白博峰，等．多孔球层内沸腾现象与传热特性研究[J]．核动力工程，2009,30(1):045-050.
- [6] Wang Z,Peng X F,Ochterbeck J M.Dynamic bubble behavior during boiling in bead-packed structures[J].Int.J.Heat and Mass Transfer,2004,47:4771-4783.
- [7] Klausner J F,Mei R,Bernhard D M,et al.Vapor bubble departure in forced convection boiling[J].Int.J.Heat Mass Transfer,1993,36(3):651-662.
- [8] Kolev N I.The influence of mutual bubble interaction on the bubble departure diameter[J].Exp.Thermal Fluid Science,1994,8:167-174.
- [9] Zeng L Z,Klausner J F,Bernhard D M,et al.A unified model for the prediction of bubble detachment diameters in boiling systems.II.Flow boiling[J].Int.J.Heat Mass Transfer,1993,36:2271-2279.
- [10] Ishii M,Zuber N.Drag coefficient and relative velocity in bubbly,droplet and particulate flows[J].AIChE J,1979,25:843-855.