Planar laser-based measurements of droplet size, volume fraction, and velocity in flow-blurring sprays

IF 2.5 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2025-08-04 DOI:10.1007/s00348-025-04075-0

Surendra Kumar Soni, Abhishek Kumar Gupta, Keshav Yadav, Yogeshwar Nath Mishra, Santanu De

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引用次数: 0

Abstract

We employ advanced laser-based diagnostics to investigate the spray characteristics of a custom-designed flow-blurring (FB) atomizer. Structured Laser Illumination Planar Imaging (SLIPI)-based methods are utilized to obtain two- and three-dimensional (2D–3D) maps of the droplet Sauter Mean Diameter (SMD) and planar liquid volume fraction, while the conventional particle image velocimetry is used to measure droplet velocities within the spray in 2D. Water and ethanol sprays are investigated across a range of air-to-liquid mass ratios (ALRs = 2–5). The SLIPI-based fluorescence/scattering ratio maps of droplet relative SMD are calibrated and compared using the Phase Doppler Particle Analyzer data, demonstrating strong agreement with a low mean absolute percentage error (MAPE), especially at lower ALR. However, at higher ALR, the optically dense sprays result in increased multiple scattering effects, leading to higher MAPE values. SLIPI effectively captures the transient and polydisperse nature of FB sprays, with droplet size distributions closely following a gamma function. Additionally, a correlation for SMD is developed in terms of key non-dimensional groups, which represent the geometric parameters, physical properties of the working fluid, and spatial locations within the spray. The relevant dimensionless groups in the SMD correlation based on the geometric and physical properties are Laplace number (300-9700), liquid Reynolds number (\(\text{Re}_l=95\) and 140), and Ohnesorge number (\(\text{Oh}=0.0027\) and 0.0065).

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流动模糊喷雾中液滴尺寸、体积分数和速度的平面激光测量

我们采用先进的基于激光的诊断来研究定制设计的流动模糊（FB）雾化器的喷雾特性。利用基于结构激光照明平面成像（SLIPI）的方法获得液滴平均直径（SMD）和平面液体体积分数的二维和三维（2D - 3d）图，而传统的粒子图像测速法用于测量二维喷雾内的液滴速度。水和乙醇喷雾在空气-液体质量比（ALRs = 2-5）范围内进行了研究。利用相位多普勒粒子分析仪的数据，对基于slipi的液滴相对SMD的荧光/散射比图进行了校准和比较，结果表明与较低的平均绝对百分比误差（MAPE）非常吻合，特别是在较低的ALR下。然而，在较高的ALR下，光密集的喷雾导致多重散射效应增加，从而导致更高的MAPE值。SLIPI有效地捕获了FB喷雾的瞬态和多分散特性，液滴尺寸分布密切遵循伽马函数。此外，SMD的相关性是基于关键的无量纲群，它们代表了几何参数、工作流体的物理性质和喷雾中的空间位置。基于几何和物理性质的SMD相关性中相关的无量纲群有拉普拉斯数（300-9700）、液体雷诺数（\(\text{Re}_l=95\)和140）和Ohnesorge数（\(\text{Oh}=0.0027\)和0.0065）。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.