scholarly journals Detection of Interfacial Structures in Inclined Liquid-Liquid Flows Using Parallel-Wire Array Probe and Planar Laser-Induced Fluorescence Methods

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3159 ◽  
Author(s):  
Lusheng Zhai ◽  
Zihan Meng ◽  
Jie Yang ◽  
Hongxin Zhang ◽  
Ningde Jin
Keyword(s):  
Cross Sections ◽  
High Speed ◽  
Wire Array ◽  
Laser Induced Fluorescence ◽  
Parallel Wire ◽  
Planar Laser Induced Fluorescence ◽  
Interfacial Structures ◽  
Planar Laser ◽  
Liquid Flows ◽  
Inclined Pipes

Flows of two immiscible liquids through inclined pipes are often encountered in industrial processes. The interfacial characteristics in inclined pipes are of significance for understanding the mechanism of flow pattern transition and modeling the flow parameters. This paper developed a novel experimental technique to access the interface characteristics of liquid-liquid flows, during which optical and electrical methods were successfully combined by matching the refractive index and conductivity of the flows. A planar laser-induced fluorescence (PLIF) system was set up with a continuous laser and high-speed camera. Organic and aqueous phases were chosen to match refractive indices. The liquid-liquid interface in the middle of the pipe could be clearly visualized by the PLIF system. Meanwhile, two conductance parallel-wire array probes (CPAPs) were designed to reconstruct the liquid-liquid interfaces at upward and downward pipe cross-sections. The performances of the CPAP were validated using the PLIF results and employed to investigate the liquid-liquid interfacial structures. The interfacial shape and its instability were uncovered using the reconstructed interfaces by the CPAPs.

scholarly journals Investigation of Flame Evolution in Heavy Oil Boiler Bench Using High-Speed Planar Laser-Induced Fluorescence Imaging

2018 ◽  
Vol 8 (9) ◽  
pp. 1691 ◽  
Author(s):  
Jiangbo Peng ◽  
Zhen Cao ◽  
Xin Yu ◽  
Yang Yu ◽  
Guang Chang ◽  
...  
Keyword(s):  
Heavy Oil ◽  
High Speed ◽  
Combustion Process ◽  
Laser Induced Fluorescence ◽  
Bench Test ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser ◽  
Wrinkled Structure ◽  
Good Agreement

Over recent years, much attention has been paid to the performance evaluation of industrial-type burners. The ignition and stable combustion process are of great significance in assessing the quality of burner. The planar laser-induced fluorescence (PLIF) technique can be applied to heavy oil boilers, extending this technique to engineering applications. Considering the complex environment of the bench test, measures such as temperature control and moisture proofing are made to improve the possibility of detection using PLIF. In this paper, an experimental investigation of flame growth following ignition is reported. A wrinkled structure could be observed from the configuration of the ignition flame; its trajectory will be depicted. The results showed that the wrinkled structure developed downward, i.e., by deviation from the direction of the airflow. The displacement velocity of the flame was used to describe the combustion rate. Good agreement was obtained for the flame shapes of both forced ignition and autoignition. In addition, the center of combustion deviated from the center of boiler, possibly due to some irregularity in the burner’s assembly which was critical to the design of the combustion chamber.

Study on laser for applications in high-speed planar laser induced fluorescence

2017 ◽  
Vol 46 (12) ◽  
pp. 1205001
Author(s):  
李旭东 Li Xudong ◽  
周益平 Zhou Yiping ◽  
闫仁鹏 Yan Renpeng ◽  
潘虎 Pan Hu ◽  
陈德应 Chen Deying ◽  
...  
Keyword(s):  
High Speed ◽  
Laser Induced Fluorescence ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser
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