气泡微细化沸腾(Micro-bubble Emission Boiling,MEB)是一种特殊的过冷沸腾现象,当其发生时加热面的热流密度会远高于临界热流密度(Critical Heat Flux,CHF)。根据采集到的可视化沸腾资料,对MEB的传热机理进行了分析。结果表明,MEB发生时,加热面上不稳定气膜的周期性破裂,破坏了过热液层,导致了良好的气液置换对流换热。考虑MEB的特殊传热过程,对Rohsenow关系式中部分项进行修正,并根据最小二乘法对实验数据进行拟合,得到了适用于10 mm铜加热面上的MEB沸腾关系式,误差不超过±15%,可满足一般的工程计算要求。 Micro-bubble Emission Boiling (MEB) is a special phenomenon of subcooled boiling. When it occurs, the heat flux of the heated surface is much higher than the critical heat flux (CHF). According to the collected visual boiling data, the heat transfer mechanism of MEB was analyzed. The results show that when the MEB occurs, the periodic rupture of the unstable gas film on the heating surface destroys the overheated liquid layer, resulting in a good gas-liquid displacement convection heat transfer. Considering the special heat transfer process of MEB, some items of Rohsenow relation are modified, and the experimental data are fitted according to the least squares method. The MEB boiling relation for 10 mm copper heating surface is obtained, the error does not exceed ± 15%, to meet the general engineering calculation requirements.