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Experimental study of atomization of liquid nitrogen jet impingement

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Abstract

In this study, the behavior of liquid nitrogen jets and dual-like jet impingement of liquid nitrogen discharged from needle injectors were evaluated. Water has also been used to investigate the behavior of liquid jets and jet impingement at low Reynolds numbers. High-speed photography has been used to investigate various patterns formed in this interaction. The velocities of the liquid nitrogen jets varied from 12 to 34 m/s corresponding to Reynolds number from 50,000 to 136,000. By qualitatively comparing the photographs taken from the water jet impingement, the velocity range and Reynolds number corresponding to closed rim, periodic rim, open rim and fully developed sheet models were determined. In this study, the breakup model of liquid nitrogen jet impingement in a test chamber with a pressure of 2 bar and a temperature of 77 K is a fully developed and the surface of jets is completely wavy. The impingement of wavy jets creates impingement waves on the surface of the sheet. As the speed of the jets increases, the dimensions of the liquid sheet become smaller due to the formation of stronger impingement waves and the faster breakup of the liquid sheet. In addition to liquid nitrogen jets, saturated liquid nitrogen jets have also been studied. The impingement of two saturated liquid nitrogen jets with an angle of impingement of 60 degrees and standard atmospheric condition and low injector pressure causes the formation of a two-phase spray sheet in the form of a bell. As the injection pressure increases, the liquid phase in the jet increases and the spray angle of the jet impingement increases.

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Authors and Affiliations

  1. Faculty of Aerospace Engineering, Malek Ashtar Industrial University, Shahinshahr, Iran

    Davood Moosavian & Alireza Mostofizadeh

  2. School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

    Hojat Ghassemi

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  1. Davood Moosavian
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Correspondence to Hojat Ghassemi.

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Moosavian, D., Ghassemi, H. & Mostofizadeh, A. Experimental study of atomization of liquid nitrogen jet impingement. J Braz. Soc. Mech. Sci. Eng. 45, 302 (2023). https://doi.org/10.1007/s40430-023-04217-7

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