Characterization of phase detection optical probes for the measurement of the dispersed phase parameters in sprays
Characterization of phase detection optical probes for the measurement of the dispersed phase parameters in sprays
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DOI：
10.1016/j.ijmultiphaseflow.2004.04.004
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发表时间：
2004-06-01
影响因子：
3.8
通讯作者：
Hopfinger, EJ
中科院分区：
文献类型：
--
作者：
Hong, MG;Cartellier, A;Hopfinger, EJ
为了能够研究例如由同轴喷射器产生的密集喷雾的特性和空间演化，已经开发了基于相位检测光学探针的测量技术。锥形光学探针以前已成功地用于泡状流。除了局部浓度外，还通过分析脱湿时间推导出气体包裹体的速度，并结合气体停留时间得到气泡尺寸。在这里，它表明，这种技术也可以是有帮助的密集喷雾液滴特性的测量。使用控制条件下的下降的大小，速度和轨迹，它表明，对于直径超过30微米的下降，速度和大小进行评估的不确定性小于约15%，包括在影响条件的变化。一个适应的信号处理已被证明是弱敏感的各种标准介绍。当施加到喷雾产生的二维气液混合层，体积通量由探头测量的采样技术，同意在15%以内。为了说明这个相当客观的工具的能力，一些结果提供和分析的下降速度和弦，以及浓度和界面面积密度在近场的密集喷雾具有较宽的尺寸分布。(C)2004爱思唯尔有限公司保留所有权利。
In order to be able to investigate the characteristics and the spatial evolution of dense sprays produced by coaxial injectors for instance, a measuring technique based on a phase detection optical probe has been developed. Conical optical probes have previously been successfully used in bubbly flows. Aside local concentration, the velocity of gas inclusions was deduced from the analysis of the dewetting time, and, combined with the gas residence time, the bubble size was obtained. Here, it is shown that this technique can also be helpful for the measurements of drop characteristics in dense sprays. Using controlled conditions in terms of drop size, velocity and trajectory, it is demonstrated that for drops above 30 mum in diameter, the velocity and size are evaluated with an uncertainty less than about 15% including variations in the impact conditions. An adapted signal processing has been developed which is shown to be weakly sensitive to the various criteria introduced. When applied to sprays generated by a two-dimensional gas-liquid mixing layer, volumetric fluxes measured by the probe are shown to agree within 15% with a sampling technique. To illustrate the capability of this fairly objective tool, some results are provided and analyzed for the drop velocities and chords as well as for the concentration and the interfacial area density in the near field of dense sprays with a wide size distribution. (C) 2004 Elsevier Ltd. All rights reserved.