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Open AccessFeature PaperArticle

Investigation on Asymmetric Instability of Cylindrical Power-Law Liquid Jets

1
State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2
Internal Combustion Engine Research Institute, Tianjin University, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(14), 2785; https://doi.org/10.3390/en12142785
Received: 28 June 2019 / Revised: 15 July 2019 / Accepted: 16 July 2019 / Published: 19 July 2019
(This article belongs to the Section Energy Fundamentals and Conversion)
An investigation has been performed to reveal the breakup mechanism of three-dimensional power-law cylindrical jets with different mode disturbances. It is observed experimentally that the asymmetric mode disturbances could prevail over the counterpart of symmetric mode under special conditions. The dispersion equation characterizing the instability of three-dimensional cylindrical jets of power-law fluids is deduced. The effects of the Weber number, generalized Reynolds number, power-law exponent, and gas–liquid density ratio on the jet instability are studied in detail. It is found that the maximum growth rates of asymmetric mode disturbances are usually larger than those of symmetric mode disturbances under high Weber numbers and low generalized Reynolds numbers, which implies that the former are more likely to be responsible for the breakup of power-law fluids. Meanwhile, the large gas–liquid interaction could trigger more short, unstable waves. Interestingly, with the increase of jet velocity, the interaction between liquid and gas phases plays an increasingly leading role on the breakup of power-law cylindrical jets, whereas the viscous force and the power-law exponent have less significant impacts. Theoretical analysis results give a better comprehensive understanding for the power-law jets. View Full-Text
Keywords: power-law fluid; asymmetric mode disturbances; temporal mode power-law fluid; asymmetric mode disturbances; temporal mode
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MDPI and ACS Style

Guo, J.-P.; Bai, F.-Q.; Chang, Q.; Du, Q. Investigation on Asymmetric Instability of Cylindrical Power-Law Liquid Jets. Energies 2019, 12, 2785.

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