PHOTOGRAPHIC AND NUMERICAL STUDY OF BUBBLE DYNAMICS DURING NATURAL-CIRCULATION BOILING OF LIQUID NITROGEN IN A VERTICAL ANNULAR
Visualization experiments of natural-circulation boiling of liquid nitrogen are conducted in the heat flux range of 56～4085 W/m2, using a vertical annular composed of a heating core and a glass tube. The photos of bubble generation and detachment are acquired with a frequency of 2000 f/s using a high speed CCD camera. Correlations of the bubble detachment diameter and bubble detachment frequency are proposed on the base of experimental data. Then the new correlations are incorporated in the two-fluid model and two-dimensional numerical simulations are performed. Comparison of the numerical results against the experimental data demonstrated that the new correlations achieve satisfactory agreement with the experimental data.
X.D.LI W.WEI R.S.WANG
School of Mechanical Engineering, Shanghai Jiaotong University,800 Dongchuan Road, Shanghai 200240, China
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）