CAJ | 학술논문

采用考虑了气泡破碎和聚并的平均气泡数密度（ABND）输运方程，并与计算流体力学（CFD）中的湍流双流体模型相结合，建立 CFD-ABND 耦合计算模型。运用该模型对含固体颗粒气体通过冷却管穿越液池过程中液池内的气泡尺寸和气液界面浓度进行数值模拟。定量获得了液池内气泡尺寸和气液界面浓度分布，并分析了气速变化对其影响规律。结果表明：所建立的 CFD-ABND 模型能够对液池中的气泡尺寸及气液界面浓度分布等气泡特性进行较好预测；在靠近冷却管外壁面附近区域形成较大尺寸气泡和较高气液界面浓度；液池内隔板的存在有助于气液扰动，使液池内总体的气泡尺寸得到有效降低及气液界面浓度得到提升。
채용고필료기포파쇄화취병적평균기포수밀도（ABND）수운방정，병여계산류체역학（CFD）중적단류쌍류체모형상결합，건립 CFD-ABND 우합계산모형。운용해모형대함고체과립기체통과냉각관천월액지과정중액지내적기포척촌화기액계면농도진행수치모의。정량획득료액지내기포척촌화기액계면농도분포，병분석료기속변화대기영향규률。결과표명：소건립적 CFD-ABND 모형능구대액지중적기포척촌급기액계면농도분포등기포특성진행교호예측；재고근냉각관외벽면부근구역형성교대척촌기포화교고기액계면농도；액지내격판적존재유조우기액우동，사액지내총체적기포척촌득도유효강저급기액계면농도득도제승。
An average bubble number density (ABND) transport equation considering bubbles breakup and coalescence was merged with the Euler-Euler turbulence two-fluid model in the Computational Fluid Dynamics (CFD) to establish the CFD-ABND coupling model which was used to study the bubble size distribution and the interfacial area concentration (IAC) distribution in the pool when the gas-solid flow passed through the pool. The quantitative results of bubbles size and IAC distribution were observed, and the influence of gas velocity on the distribution of the bubble and the IAC was analyzed. It was found that the present model had a better performance for predicting the bubble size and IAC distribution. The results showed that the larger bubble and the higher IAC mainly existed near the exit and outer wall of the cooling tube. The separator inserter IAC in the pool was very helpful to strengthen the disturbance between gas and liquid, which could effectively reduce the bubble size and increase the IAC.