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Atomization and Sprays

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ISSN Print: 1044-5110

ISSN Online: 1936-2684

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AN EXPERIMENTAL INVESTIGATION ON LIQUID SHEET BREAKUP DUE TO PERFORATIONS IN IMPINGING JET ATOMIZATION

Volume 32, Issue 2, 2022, pp. 35-54
DOI: 10.1615/AtomizSpr.2021037826
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ABSTRACT

In this work, atomization of the liquid sheet formed by two like-on-like impinging liquid jets is studied experimentally. The primary focus of this study concerns sheet breakup due to the formation and growth of perforations on the liquid sheet. In this mode of atomization, perforations or holes originate at a location where the liquid sheet becomes thin due to stretching. As time elapses, these perforations will grow in size and move either toward the bottom or toward the rim of the sheet. Depending on the initial location of their formation, these perforations either interact with the rim of the sheet or with other surrounding perforations and disintegrate the sheet into ligaments, which further disintegrate into drops. The phenomenon of perforation formation and growth is captured using a high-speed backlight imaging technique and processed using in-house-developed image processing algorithms based on MATLAB. The effect of liquid properties and Reynolds number on the growth of perforations is studied in this work. Based on the experiments conducted in this study, perforation-based atomization is broadly classified into three different modes. In the first mode, a single perforation interacts with the rim and disintegrates the sheet into ligaments. In the second mode, two or more perforations interact, and their common area of interaction is disintegrated into ligaments and droplets. In the third mode, the liquid sheet breaks up due to perforation interaction with impact waves. Studies on atomization behavior of the liquid sheet at high ambient pressure up to 0.8 MPa revealed improved atomization.

Figures

  • Experimental setup for atmospheric study
  • Experimental setup for high pressure studies
  • Schematic of injector setup
  • Detachment of the liquid sheet due to instabilities originated around impingement point
  • Change in pattern from sheet to periodic drop pattern for 20 mPa.s liquid
  • (a) Different modes of sheet breakup on Re-We plot; (b) representative images for different modes
of sheet breakup
  • Evolution of a single perforation on the liquid sheet with time
  • Change of equivalent diameter with time for a single perforation formed on the liquid sheet at Rej
of 200 and Wej of 268
  • Merging of two equal-sized perforations originated very close to each other at a Rej of 250 and
Wej of 419
  • Interaction of two perforations forming a chain of liquid sheets due to twisting
  • Disintegration of liquid sheet by interaction of multiple perforations
  • Growth rate with respect to Weber number at different viscosities
  • Evolution of the liquid sheet at higher ambient pressure
  • Atomization behavior of the liquid sheet at elevated pressure condition
  • Interaction of perforations with waves at elevated pressure condition
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