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Open AccessArticle

Formation and Breakup of an Immiscible Compound Jet with Density or Viscosity Stratification

1
Graduate School of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
2
Faculty of Vehicle and Energy Engineering, Phenikaa University, Yen Nghia, Ha-Dong District, Hanoi 100803, Vietnam
3
Faculty of Mechanical Engineering and Mechatronics, Phenikaa University, Yen Nghia, Ha-Dong District, Hanoi 100803, Vietnam
4
Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 100803, Vietnam
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(22), 4817; https://doi.org/10.3390/app9224817
Received: 17 October 2019 / Revised: 4 November 2019 / Accepted: 5 November 2019 / Published: 11 November 2019
(This article belongs to the Section Civil Engineering)
Formation of compound drops by breakup of an axisymmetric compound jet injected from a coaxial nozzle into another immiscible coflowing fluid, at various density and viscosity ratios, is numerically investigated. The fluids are assumed to be Newtonian and incompressible and gravity is neglected for simplicity. A Finite Difference Method with Front Tracking is used to track the evolution and breakup of the compound jet. The outcomes of our numerical results show how density and viscosity ratios affect the compound jet’s transition from dripping to jetting mode. The density ratios of inner-to-outer and intermediate-to-outer fluids affect compound jet breakup length, drop diameter and drop formation time more than comparable viscosity ratios. At high density and viscosity ratios, due to high inertia and viscous force respectively, the drop formation is more chaotic and mostly multi-core drops are formed. View Full-Text
Keywords: laminar flow; compound jet; front-tracking; density ratio; viscosity ratio; dripping; jetting; coflowing fluid laminar flow; compound jet; front-tracking; density ratio; viscosity ratio; dripping; jetting; coflowing fluid
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    Doi: 10.5281/zenodo.3497283
    Description: Animations of compound jet formation and breakup
MDPI and ACS Style

Bhagat, K.D.; Vu, T.V.; Wells, J.C. Formation and Breakup of an Immiscible Compound Jet with Density or Viscosity Stratification. Appl. Sci. 2019, 9, 4817.

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