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ISSN Печать: 2169-2785
ISSN Онлайн: 2167-857X
Indexed in
FLASHING LIQUID JETS IN LOW-PRESSURE ENVIRONMENT
Краткое описание
In the present paper, highly expanded flashing liquid jets in a low-pressure environment are studied experimentally, particularly focusing upon the physics associated with liquid flashing regimes. A long, straight stainless steel capillary with an inner diameter of 0.23 mm and a length of 17.0 mm is used as the nozzle, which is connected with a syringe. Through a solenoid valve, a test vessel is connected with a vacuum chamber with a volume about 800 times bigger than that of the test vessel, in order to keep constant pressure inside the test vessel throughout every experimental run. Distilled water of about 1 mL is filled into the syringe at first, while the syringe is open to the ambient. Then, opening the solenoid valve, the air inside the test vessel will be evacuated quickly, resulting in a quick depressurization and a low backpressure inside the test vessel. The water in the syringe is then driven by the difference between the ambient pressure and the backpressure to form a highly expanded flashing liquid jet into the test vessel. For the case of low initial temperature and high backpressure, there is no evaporation, and then the flow of the liquid jet from the nozzle exit section remains intact and follows a straight path. On the other hand, if the initial temperature is high and/or the backpressure is low enough to lead a superheated exit condition, evaporation will take place, irregular evaporation waves around the liquid core are visible, and the jet shattering occurs. On further decreasing the backpressure, the liquid jet shatters giving rise to a cloud of droplets with a spray angle usually bigger than 90°, indicating a large number of nucleation sites and rapid bubble growth. It is also shown that there is flow choking behavior as the flow rate becomes constant and is insensitive to pressure reduction below some backpressure threshold.
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Liu Lu, Bi Qincheng, Wang Guoxiang, Rapid Solidification Process of a Water Droplet Due to Depressurization, Microgravity Science and Technology, 25, 6, 2014. Crossref
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Volkov R.S., Kuznetsov G.V., Strizhak P.A., Experimental investigation of mixtures and foreign inclusions in water droplets influence on integral characteristics of their evaporation during motion through high-temperature gas area, International Journal of Thermal Sciences, 88, 2015. Crossref
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Ma Wei, Zhai Siping, Zhang Ping, Xian Yaoqi, Zhang Lina, Shi Rui, Sheng Jiang, Liu Bo, Wu Zonglin, Research Progresses of Flash Evaporation in Aerospace Applications, International Journal of Aerospace Engineering, 2018, 2018. Crossref
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Alghamdi Tariq, Thoroddsen Sigurdur T., Hernández-Sánchez J.F., Ultra-high speed visualization of a flash-boiling jet in a low-pressure environment, International Journal of Multiphase Flow, 110, 2019. Crossref
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Mansour Ahmad, Müller Norbert, A review of flash evaporation phenomena and resulting shock waves, Experimental Thermal and Fluid Science, 107, 2019. Crossref
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Yaskin A. S., Zarvin A. E., Kalyada V. V., Dubrovin K. A., Khudozhitkov V. E., Flow of Ethanol into a Medium with Varying Degrees of Rarefaction, SIBERIAN JOURNAL OF PHYSICS, 17, 1, 2022. Crossref
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Liu Lu, Ma Wenjing, Wang Mo, Zong Luxiang, Comparison of bubble growth process within a superheated water droplet and in superheated water due to rapid depressurization, International Journal of Heat and Mass Transfer, 109, 2017. Crossref
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Yaskin A. S., Zarvin A. E., Dubrovin K. A., Kalyada V. V., Features of the Flow of a Model Liquid Into a Medium With a Variable Degree of Rarefaction, Journal of Fluids Engineering, 144, 7, 2022. Crossref
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Yaskin A.S., Zarvin A.E., Dubrovin K.A., Kalyada V.V., Bifurcation of a liquid micro-jet in a vacuum, Vacuum, 198, 2022. Crossref
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Mansour Ahmad, Müller Norbert, Experimental investigation on flashing water jet and resulting shock wave, Alexandria Engineering Journal, 61, 8, 2022. Crossref