«上一篇
 文章快速检索 高级检索

 哈尔滨工程大学学报  2019, Vol. 40 Issue (9): 1595-1600  DOI: 10.11990/jheu.201802026 0

### 引用本文

WEN Jiming, SUN Zhongning, GU Haifeng, et al. A theoretical analysis of bubbling to degas methyl iodide by evaporation[J]. Journal of Harbin Engineering University, 2019, 40(9), 1595-1600. DOI: 10.11990/jheu.201802026.

### 文章历史

A theoretical analysis of bubbling to degas methyl iodide by evaporation
WEN Jiming , SUN Zhongning , GU Haifeng , LIU Ziping
Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China
Abstract: Radioactive materials produce a significant amount of heat in the bubble filters of filtered containment venting systems. To solve this problem, this study investigated the influence law and influence mechanism of degasification. A numerical model of bubbling for degasification was established according to the mass, energy, and component concentration conservation equations of gas inside the bubble, as well as the specific mass transfer and heat transfer boundary condition at the liquid-gas interface, and the nondimensionalization method was adapted to realize numerical calculation. The calculation results suggest that within a very short time after bubble formation, the evaporation caused by sensible heat disappeared, while the evaporation resulting from decay heat could significantly reduce the effect of degassing by bubbling.
Keywords: bubble    degasification    evaporation    decay heat    bubble filter    methyl iodide    numerical calculation    nondimensionalization

1 理论模型及网格无关性验证

 Download: 图 1 初始参数设定示意图 Fig. 1 The sketch map of setting initial parameters

 ${\mathit{C}_\mathit{p}}{\rm{ = 99}}{\rm{.56 + 0}}{\rm{.093}}\mathit{t}$ (1)

 $\lambda = 0.000\;067t + 0.025\;581$ (2)

 ${D_1} = 7.4 \times {10^{ - 8}}{\left( {\beta {M_3}} \right)^{1/2}}T/\left( {{\mu _3}V_1^\prime } \right)$ (3)

 ${D_2} = \frac{{{{10}^{ - 7}}{T^{1.75}}\left( {1/{M_1} + 1/{M_2}} \right)}}{{p{{\left[ {{{\left( {\mathit{\Sigma }{V_1}} \right)}^{1/3}} + {{\left( {\mathit{\Sigma }{V_2}} \right)}^{1/3}}} \right]}^2}}}$ (4)

 ${K_c} = 1.69 \times {10^{ - 5}}\exp \left( {\frac{{7\;200}}{{RT}}} \right)$ (5)

 Download: 图 2 网格无关性验证结果 Fig. 2 The results of independence verification on grids
2 蒸发因素对除气过程的影响

 $e(\tau ) = \frac{{{c_t}}}{{{c_t}(\tau )}}$ (6)

 Download: 图 3 蒸发对甲基碘去除因子影响 Fig. 3 The influence of methyl iodide on the decontamination factor for methyl iodide

 Download: 图 4 甲基碘去除因子与液膜厚度的关系 Fig. 4 The relationship of decontamination factor for methyl iodide and liquid film thickness

 Download: 图 5 蒸发对甲基碘浓度场分布影响 Fig. 5 The influence of evaporation on methyl iodide concentration distribution

 Download: 图 6 各特征参数随气泡生成时间的变化 Fig. 6 Variation of different parameters with bubble formation time
 Download: 图 7 气泡边界处的蒸汽份额随气泡生成时间的变化 Fig. 7 Variation of evaporation concentration at bubble surface with bubble formation time

 Download: 图 8 衰变热功率对甲基碘去除因子影响 Fig. 8 The influence of decay heat power on the decontamination factor for methyl iodide

 Download: 图 9 气泡无量纲直径随气泡生成时间的变化 Fig. 9 Variation of dimensionless bubble diameter with bubble formation time

 Download: 图 10 不同时刻下气泡无量纲速度分布 Fig. 10 The dimensionless bubble velocity distribution at different bubble formation times