运用平衡态分子动力学理论对含有液氩分子微正则系统的微气泡的形成过程进行模拟.采用五阶预估-校正有限差分法对每个分子的牛顿运动方程进行求解,该方法能够较好地满足能世守恒特性.通过统计各时刻系统的动能,势能以及总能量,得到了气泡生长过程中各相分子的分布形貌,并且分析了温度对气泡生长过程的影响及相界面不稳定的原因.模拟得到:气泡形成过程可分成四部分:团聚段、成核段、等温成长段以及等压成长段,以此粗略估计气泡的成核时间大约为0.2×10-11s.温度对于沸腾的团聚和成核时间没有影响.当过热度大于22 K时,随着过热度增大,两相区域数密度波动特别大.相界面不稳定是气泡的破碎引起的.
参考文献
| [1] | Fritz W .Maximum Volume of Vapor Bubble[J].Physik Zeitschr,1935,36:379-384. |
| [2] | Snyder NR;Edwards DK .Summary of Conference on Bubble Dynamics and Boiling[J].Int J Heat Mass Transfer Memo Jet Propulsion Laboratory Pasadena,1956,20(137):14-15. |
| [3] | Moore FD;Mcsler RB .The Measurement of Rapid Surface Temperature Fluctuations During Nucleate Boiling of Water[J].AICHE Journal,1961,7:620-624. |
| [4] | Cooper MG;Lloyd AJP .The Microlayer in Nucleate Pool Boiling[J].Int.J Heat and Mass Transfer,1969,12:895-913. |
| [5] | Mikic BB;Rohsenow WM;Griffith P .On Bubble Growth Rates[J].International Journal Heat Mass and Transfer,1970,13:647-666. |
| [6] | Gorenflo D;Knabe V;Belling V.Bubble Density on Surfaces with Nucleate Boiling-Its Influence on Heat Transfer and Burnout Heat Flux at Elevated Saturation Pressures[A].San Francisco,CA,USA,1986:1995-2000. |
| [7] | Son G;Dhir VK .Nucleation on Site During Pool Necleation Boiling[J].Journal of Heat Transfer,2002,124:51-62. |
| [8] | W J Yang;K T Tsutsui .Overview of Boiling on Microstructures-Macrobubblcs from Micro Heaters[J].Microscale Thermophysical Engineering,2000,4:7-24. |
| [9] | S Maruyama .Molecular Dynamics Method for Microscale Heat Transfer[J].Advances in Numerical Heat Transfer,2002,2:189-226. |
| [10] | S. H. Park;J. G. Weng;C. L. Tien .A molecular dynamics study on surface tension of microbubbles[J].International Journal of Heat and Mass Transfer,2001(10):1849-1856. |
| [11] | M E Parker;D M Heyes .Molecular Dynamics Simulation of Stretched Water:Local Structure and Spectral Signatures[J].Journal of Chemical Physics,1998,108:9039-9049. |
| [12] | Kinjo T.;Matsumoto M. .Cavitation processes and negative pressure[J].Fluid Phase Equilibria,1998(1/2):343-350. |
| [13] | T Kinjo;K Ohguchi;K Yasuoka et al.Computer Simulation of Fluid Phase Change:Vapor Nucleation and Bubble Formation Dynamics[J].Computation Materials Science,1999,14:138-141. |
| [14] | 陆建峰,彭晓峰.团聚填充模型和胚泡形成[C].中国工程热物理学会第十届年会论文集(传热传质学),2001:323-327. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%