放射性气溶胶同时荷电-凝并模型的开发

Development of simultaneous charging-coagulation model for radioactive aerosols

放射性气溶胶发生衰变时会引起表面电荷累积,带电颗粒间发生静电相互作用,影响气溶胶的演化和迁移。为了探究颗粒荷电对气溶胶凝并行为的影响,从气溶胶荷电-凝并机制出发,建立完整的荷电-凝并双变量群平衡方程,使用分区法和单元平均技术数值求解。开发适用于放射性气溶胶发生的荷电-凝并行为的计算模型,使用近似解析方法和经典实验进行验证分析。结果表明:荷电-凝并模型能够准确预测与放射性气溶胶同时发生的荷电-凝并行为,对颗粒荷电对凝并动力学行为的直接影响进行阐释。

The decay of radioactive aerosols leads to the accumulation of surface charges and the occurrence of electrostatic interactions among charged particles,thereby influencing the evolution and migration of aerosols.To study the impact of particle charging on condensation behavior,a comprehensive charging-coagulation kinetic equation was formulated.Subsequently,the bivariate group balance equation was discretized and numerically solved using the sectional method and cell average technology.A computational code was developed and validated through comparison with approximate analytical solutions and classical experiments.The results show that the simultaneous charging-coagulation model is capable to accurately predict the simultaneous charging-coagulation behavior of radioactive aerosols and elucidate the direct effect of particle charging on the coagulation behavior.