Skip to main content
Log in

Filament thinning of silicone oil/poly(methyl methacrylate) suspensions under extensional flow

  • Original Contribution
  • Published:
Rheologica Acta Aims and scope Submit manuscript

Abstract

We investigate the effect of particles dispersed in a Newtonian medium on the filament breakup of suspensions under extensional flow. In particular, we focus on the final stage of the breakup process: 10 μm poly(methyl methacrylate) (PMMA) particles with 0∼20 wt% are dispersed in silicone oil and the effects of the added particles on the thinning dynamics of the filament are observed with time-dependent changes in the minimum neck diameter (W). The particles decelerate the breakup process until the minimum thickness (W) of the filament becomes 5 d (d = 10 μm: particle diameter), and then they accelerate the process rapidly until the pinch-off. When the thinning dynamics and filament shape of the 20 wt% PMMA suspension are compared with those of a silicone oil with the same viscosity and surface tension, the particles affect the thinning dynamics by changing the breakup velocity under W∼35 d compared with the viscosity-matched silicone oil. When the filament becomes thinner than W∼10 d, the particles induce different surface shapes compared with those of the viscosity-matched silicone oil. When the filament becomes thinner than W∼5 d, the roughness of the filament surface increases. Thus, the effect of the particles in the final stage of filament breakup is more complicated than that in the initial stage, and we demonstrate that the particles dispersed in a Newtonian medium induce complex behaviors in the final stage of filament breakup.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12

Similar content being viewed by others

References

Download references

Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant (No. 2013R1A2A2A07067387) funded by the Korea government (MEST).

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Kyung Hyun Ahn.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Moon, J.Y., Lee, S.J., Ahn, K.H. et al. Filament thinning of silicone oil/poly(methyl methacrylate) suspensions under extensional flow. Rheol Acta 54, 705–714 (2015). https://doi.org/10.1007/s00397-015-0861-z

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00397-015-0861-z

Keywords

Navigation