粘性气体中粘性液体射流分裂与雾化机理研究

采用线性稳定性分析的方法对粘性气体中的粘性液体射流的分裂与雾化机理进行了分析,数值计算表明:液体射流分裂与雾化过程中存在一临界气体韦伯数We2c=1,We2＜We2c对应的是射流分裂过程,We2＞We2c对应的是射流雾化过程,射流分裂过程和雾化过程的机理有所不同.当We2＜1时,We2对射流分裂过程具有稳定性的作用;当We2＞1时,We2对射流雾化过程起着不稳定性的作用.液体Reynolds数Re1在整个射流过程中始终起着不稳定性的作用,气体Reynolds数Re2的作用却相反.气液密度比Q,即气动力在整个射流分裂与雾化过程中始终起着不稳定性的作用.

Mechanisms of breakup and atomization of a viscous liquid jet in a viscous gas

A linear stability analysis is presented for a viscous liquid jet in a viscous gas, and the mechanisms of the breakup and atomization of the jet are discussed. Computational results show that there exists a critical gas Weber number We_(2c)=1. When We_2We_(2c), it is the atomization mode. The mechanism of the breakup mode is in principle different to that of the atomization mode. When We_2<1, We_2 exerts a stabilizing effect on the jet, while We_2>1, We_2 makes the jet unstable. The liquid Reynolds number Re_1 always increases the instability of the jet, but the action of the gas Reynolds number Re_2 is reverse. The ratio of the gas and liquid densities(Q), namely, the aerodynamic force always intensifies the jet instability.