Two-fluid atomization of highly viscous and shear thinning non-Newtonian fluids must overcome the viscous resistance. Conventional air-blast atomizers address this requirement by operating at higher gas–liquid mass ratios (GLRs) at the cost of deteriorated efficiency. In this investigation, the atomization efficiency ${\eta }_{\mathrm{atom}}$ of a two-fluid atomizer is characterized. Fluidic design of the atomizer reduces the viscosity-induced dampening of disruptive inertia force and speeds up the breakup by providing kinetic energy of strategically positioned microjets of air. Three fluids of different viscosities and surface tensions were tested to examine the effects of properties on atomization efficiency. The presence of droplets and ligaments near the exit plane of the atomizer revealed that the atomizer enables prompt breakup of fluids without appreciable delay by viscosity. Consequently, it could break up complex non-Newtonian Jet A1 gel propellant with efficiency in the range of 0.015–0.1. Moreover, it is also capable of atomizing Newtonian fluids like water (high surface tension) with efficiency of 0.06–0.1 and Jet A1 (low surface tension) with efficiency of 0.02–0.08. Note that ${\eta }_{\mathrm{atom}}$ varied as ${\mathrm{GLR}}^b$ ($b=-0.73$ to $-0.77$) for the liquids tested in this work. The results of this investigation show that the deterioration in the performance of internally impinging atomizers at higher air and liquid throughputs is not determined by the viscosity of liquid but is predominantly due to the loss in kinetic energy of the excess air.

高粘性和剪切稀化非牛顿流体的二流体雾化必须克服粘性阻力。传统的鼓风雾化器通过在更高的气液质量比 (GLR) 下运行以降低效率为代价来满足这一要求。在本次调查中，雾化效率${\eta }_{\mathrm{原子}}$二流体雾化器的特点。雾化器的流体设计减少了粘性引起的破坏性惯性力的阻尼，并通过提供战略性定位的空气微射流的动能来加速分解。测试了三种不同粘度和表面张力的流体，以检查特性对雾化效率的影响。雾化器出口平面附近的液滴和韧带的存在表明，雾化器能够迅速分解流体，而不会因粘度而造成明显延迟。因此，它可以分解复杂的非牛顿射流 A1 凝胶推进剂，效率范围为 0.015-0.1。此外，它还能够雾化牛顿流体，如效率为 0.06-0.1 的水（高表面张力）和效率为 0.02-0.08 的 Jet A1（低表面张力）。${\eta }_{\mathrm{原子}}$ 变化为 ${\mathrm{GLR}}^{乙}$ ($乙=-0.73$ 至 $-0.77$) 用于本工作中测试的液体。这项调查的结果表明，在较高的空气和液体流量下，内部撞击雾化器的性能下降不是由液体的粘度决定的，而是主要是由于过量空气的动能损失。