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Development of an aqueous surrogate for the spray performance evaluation of viscous bioliquids
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2021-05-24 , DOI: 10.1016/j.expthermflusci.2021.110447
Mohsen Broumand , Muhammad Shahzeb Khan , Sean Yun , Zekai Hong , Murray J. Thomson

Motivated by the importance of spray evaluation of viscous bioliquids prior to their deployments in combustion devices for heat and power generation, an aqueous surrogate was developed using water, glycerol, and a surfactant for nozzle design and optimization purposes. It provides a safe, clean, and transparent alternative for the spray characterization of bioliquids in a laboratory environment, compatible with different diagnostic methods. The relative proportions of the surrogate components were determined so that the spray-related physical properties of the developed surrogate solutions, namely kinematic viscosity and surface tension, at room temperature resemble those of fast pyrolysis bio-oil (FPBO) at different fuel temperatures up to 80 °C. The rheological characteristics of both FPBO and its surrogate were measured in detail. They were then atomized using a twin-fluid nozzle at different co-flowing airflow rates, 6<Qa<16 L/min, to compare their atomization and spray performances. Similar breakup mechanisms and flow patterns were observed for them as a function of Qa. Furthermore, the number- and volume-based distributions of various sizes of droplets within the sprays exhibited similar behaviour, along with a higher uniformity at the fiber-type breakup regime in comparison with the non-axisymmetric Rayleigh and membrane-type breakup modes. The global Sauter mean diameter (SMD) and standard deviation (STD) of their sprays also showed similar trends based on Qa, albeit with some differences within 10% for the cases with proper atomization conditions. The discrepancies, which mainly stemmed from both the multiphase nature of FPBO and the dynamic behaviour of surfactant solutions, diminished at large values of the co-flowing air inertial forces. The practicality of the present approach in developing surrogates for the spray evaluation of viscous bioliquids is verified using the present study’s measurements and analyses.



中文翻译:

用于粘性生物液体喷雾性能评估的水性替代品的开发

由于粘性生物液体在用于加热和发电的燃烧装置中部署之前对其进行喷雾评估的重要性,因此使用水、甘油和表面活性剂开发了一种水性替代物,用于喷嘴设计和优化目的。它为实验室环境中生物液体的喷雾表征提供了一种安全、清洁和透明的替代方案,与不同的诊断方法兼容。确定替代组分的相对比例,以便开发的替代溶液的喷雾相关物理性质,即运动粘度和表面张力,在室温下类似于快速热解生物油 (FPBO) 在不同燃料温度下80℃。详细测量了 FPBO 及其替代物的流变特性。6<一种<16L/min,比较它们的雾化和喷雾性能。观察到类似的分解机制和流动模式作为它们的函数一种. 此外,与非轴对称瑞利和膜型破碎模式相比,喷雾中各种尺寸液滴的基于数量和体积的分布表现出相似的行为,并且在纤维型破碎状态下具有更高的均匀性。其喷雾的全局 Sauter 平均直径 (SMD) 和标准偏差 (STD) 也显示出类似的趋势一种,尽管在具有适当雾化条件的情况下存在 10% 以内的一些差异。主要源于 FPBO 的多相性质和表面活性剂溶液的动态行为的差异在较大的同流空气惯性力值下减小。使用本研究的测量和分析验证了本方法在开发用于粘性生物液体喷雾评估的替代物的实用性。

更新日期:2021-05-30
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