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Spatial droplet velocity and size profiles in effervescent atomizer-produced sprays

机译：泡腾雾化器产生的喷雾中的空间液滴速度和大小分布

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Effervescent atomizer produced sprays were studied for application to rotary kiln incinerators. The sprays were characterized by their number averaged droplet velocity profiles, Sauter mean diameter (SMD) profiles, and size-velocity correlations. Spray mass flow rates ranged from 30 to 120 g/s. Air-liquid-ratios by mass (ALRs) were between 2//100 and 10/100. Data were obtained at seven to ten radial positions across the diameter of the spray at three separate axial locations, all in the far-field (or dilute region) of the spray. The number averaged droplet velocity profiles were bell-shaped across any diameter, irrespective of ALR, liquid mass flow rate, or axial location. Velocity magnitudes were found to increase with an increase in either liquid mass flow rate or ALR, and to decrease with an increase in axial distance from the atomizer exit. SMD was found to be nearly constant across any spray diameter. On the basis of velocity-size-number flux contour plots, it was determined that the droplet size-velocity correlation is minimal. This observation, coupled with the minimal variation in SMD across a diameter, indicates that the spray can be modeled as a variable-density single-phase jet. A model was developed, based on previous gas-phase studies, to explain the development of the drop velocity profiles in the dilute spray region. Agreement between the measured drop velocities and model predictions was within 30/100 in all cases.
机译：研究了起泡雾化器生产的喷雾剂在旋转窑焚烧炉中的应用。喷雾剂的特征在于其数均液滴速度曲线，索特平均直径（SMD）曲线和尺寸-速度相关性。喷雾质量流量范围为30至120 g / s。气液质量比（ALR）在2 // 100和10/100之间。在喷雾的远场（或稀薄区域）中的三个单独的轴向位置处，在喷雾直径上的七个到十个径向位置获得了数据。数均液滴速度曲线在任何直径上均为钟形，与ALR，液体质量流量或轴向位置无关。发现速度大小随液体质量流量或ALR的增加而增加，而随着与雾化器出口的轴向距离的增加而减小。发现在任何喷雾直径上，SMD几乎都是恒定的。基于速度-尺寸-数量通量轮廓图，确定液滴尺寸-速度相关性最小。该观察结果加上整个直径上SMD的最小变化，表明可以将喷雾建模为可变密度单相射流。在先前的气相研究的基础上，开发了一个模型，以解释稀喷雾区域中液滴速度分布的发展。在所有情况下，测得的滴落速度与模型预测之间的一致性都在30/100以内。

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