Experimental investigation of non-Newtonian droplet collisions: the role of extensional viscosity

Giulia Finotello, Shauvik De, Jeroen C.R. Vrouwenvelder, Johan T. Padding, Kay A. Buist, Alfred Jongsma, Fredrik Innings, J.A.M. Kuipers

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Abstract

We investigate the collision behaviour of a shear thinning non-Newtonian fluid xanthan, by binary droplet collision experiments. Droplet collisions of non-Newtonian fluids are more complex than their Newtonian counterpart as the viscosity no longer remains constant during the collision process. Despite the complex collision dynamics, we are able to present a complete regime map based on non-dimensional Weber (We) number and impact parameter (B). We compare the collision outcomes of xanthan, glycerol and a milk concentrate at similar impact conditions. These experiments reveal very rich and complex collision morphologies for shear thinning xanthan solution, strikingly different from Newtonian droplet collisions. Unlike glycerol and milk, xanthan collisions show no reflexive separation even at very high We number. Instead of breakup, we observe disc-like shapes with an oscillating behaviour of the colliding droplets. A detailed analysis reveals that this outcome is related to increased viscous energy dissipation and extensional effects.

Original languageEnglish
Number of pages16
JournalExperiments in Fluids
Volume59
Issue number113
DOIs
Publication statusPublished - 1 Jul 2018

Fingerprint

Viscosity
viscosity
collisions
Shear thinning
Glycerol
Fluids
shear thinning
milk
glycerols
Energy dissipation
Experiments
disks (shapes)
xanthan gum
fluids
energy dissipation
Milk

Cite this

Finotello, Giulia ; De, Shauvik ; Vrouwenvelder, Jeroen C.R. ; Padding, Johan T. ; Buist, Kay A. ; Jongsma, Alfred ; Innings, Fredrik ; Kuipers, J.A.M. / Experimental investigation of non-Newtonian droplet collisions : the role of extensional viscosity. In: Experiments in Fluids. 2018 ; Vol. 59, No. 113.
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Experimental investigation of non-Newtonian droplet collisions : the role of extensional viscosity. / Finotello, Giulia; De, Shauvik; Vrouwenvelder, Jeroen C.R.; Padding, Johan T.; Buist, Kay A.; Jongsma, Alfred; Innings, Fredrik; Kuipers, J.A.M.

In: Experiments in Fluids, Vol. 59, No. 113, 01.07.2018.

Research output: Contribution to journalArticleAcademicpeer-review

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