# On the breakup of spiralling liquid jets

Research output: Contribution to journal › Article

## Standard

**On the breakup of spiralling liquid jets.** / Shikhmurzaev, Yulii; Li, Yuan; Sisoev, Grigory.

Research output: Contribution to journal › Article

## Harvard

*Journal of Fluid Mechanics*, vol. 862, pp. 364-384. https://doi.org/10.1017/jfm.2018.956

## APA

*Journal of Fluid Mechanics*,

*862*, 364-384. https://doi.org/10.1017/jfm.2018.956

## Vancouver

## Author

## Bibtex

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## RIS

TY - JOUR

T1 - On the breakup of spiralling liquid jets

AU - Shikhmurzaev, Yulii

AU - Li, Yuan

AU - Sisoev, Grigory

PY - 2019/3/10

Y1 - 2019/3/10

N2 - The generation of drops from a jet spiralling out of a spinning device, under the action of centrifugal force, is considered for the case of small perturbations introduced at the inlet. Close to the inlet, where the disturbances can be regarded as small, their propagation is found to be qualitatively similar to that of a wave propagating down a straight jet stretched by an external body force (e.g. gravity). The dispersion equation has the same parametric dependence on the base flow, but the base flow is, of course, different. Further down the jet, where the amplitude of the disturbances becomes finite and eventually resulting in drop formation, the flow appears to be quite complex. As shown, for the regular/periodic process of drop generation, the wavelength corresponding to the frequency at the inlet, increasing as the wave propagates down the stretching jet, determines, in general, not the volume of the resulting drop but the sum of volumes of the main drop and the satellite droplet that follows the main one. The proportion of the total volume forming the main drop depends on how far down the jet the drops are produced, i.e. on the magnitude of the inlet disturbance. The volume of the main drop is found to be a linear function of the radius of the unperturbed jet evaluated at the point where the drop breaks away from the jet. This radius, and the corresponding velocity of the base flow, have to be found simultaneously with the jet's trajectory by using a jet-specific non-orthogonal coordinate system described in detail in Shikhmurzaev & Sisoev (J. Fluid Mech., vol. 819, 2017, pp. 352-400). Some characteristic features of the nonlinear dynamics of the drop formation are discussed.

AB - The generation of drops from a jet spiralling out of a spinning device, under the action of centrifugal force, is considered for the case of small perturbations introduced at the inlet. Close to the inlet, where the disturbances can be regarded as small, their propagation is found to be qualitatively similar to that of a wave propagating down a straight jet stretched by an external body force (e.g. gravity). The dispersion equation has the same parametric dependence on the base flow, but the base flow is, of course, different. Further down the jet, where the amplitude of the disturbances becomes finite and eventually resulting in drop formation, the flow appears to be quite complex. As shown, for the regular/periodic process of drop generation, the wavelength corresponding to the frequency at the inlet, increasing as the wave propagates down the stretching jet, determines, in general, not the volume of the resulting drop but the sum of volumes of the main drop and the satellite droplet that follows the main one. The proportion of the total volume forming the main drop depends on how far down the jet the drops are produced, i.e. on the magnitude of the inlet disturbance. The volume of the main drop is found to be a linear function of the radius of the unperturbed jet evaluated at the point where the drop breaks away from the jet. This radius, and the corresponding velocity of the base flow, have to be found simultaneously with the jet's trajectory by using a jet-specific non-orthogonal coordinate system described in detail in Shikhmurzaev & Sisoev (J. Fluid Mech., vol. 819, 2017, pp. 352-400). Some characteristic features of the nonlinear dynamics of the drop formation are discussed.

KW - absolute/convective instability, breakup/coalescence, drops

UR - http://www.scopus.com/inward/record.url?scp=85060017849&partnerID=8YFLogxK

U2 - 10.1017/jfm.2018.956

DO - 10.1017/jfm.2018.956

M3 - Article

VL - 862

SP - 364

EP - 384

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

ER -