The Effect of a Temperature-Dependent Viscosity on Cooling Droplet-Droplet Collisions

P.M. Durubal; A. Tavanaei; K A Buist; J.A.M. Kuipers; M.W. Baltussen

doi:10.1016/j.ces.2023.119277

The Effect of a Temperature-Dependent Viscosity on Cooling Droplet-Droplet Collisions

P.M. Durubal, A. Tavanaei, K A Buist, J.A.M. Kuipers, M.W. Baltussen (Corresponding author)

Multi-scale Modelling of Multi-phase Flows

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Abstract

A detailed understanding of the collision dynamics of liquid droplets is relevant to natural phenomena and industrial applications. These droplets could experience temperature changes altering their physical properties, which affect the droplet collisions. As viscosity is one of the relevant physical properties, this study focuses on the effect of temperature on viscosity, with an Arrhenius temperature dependence, of collisions of two equal-sized droplets using the Volume of Fluid Method. The results show that the higher temperature of the droplets leads to an effectively lower viscosity, leading to increased interface oscillations. This leads to the onset of separation at lower Weber numbers as expected. The local cooling droplets will create a local viscosity profiles, which results in the formation of a ridge upon combination of droplets. In addition, the collision outcomes sometimes cannot be explained solely on basis of an effective viscosity, undermining the usefulness of existing collision regime maps.

Original language	English
Article number	119277
Number of pages	14
Journal	Chemical Engineering Science
Volume	282
DOIs	https://doi.org/10.1016/j.ces.2023.119277
Publication status	Published - 5 Dec 2023

Funding

This work is supported by the Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation programme funded by the Ministry of Education, Culture and Science, Netherlands . This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 801359 . The authors also would like to thank SURFsara and NWO domain Science for the use of the Snellius supercomputer facilities. Special thanks to D.R. Rieder for implementing the customized solver and C.M.Y. Claassen for developing the physical properties calculation in our in-house code.

Keywords

Droplet collisions
Interaction regimes
Temperature-dependent viscosity
Direct numerical simulations
Volume of Fluid (VOF)
Volume of fluid

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10.1016/j.ces.2023.119277

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The Effect of a Temperature-Dependent Viscosity on Cooling Droplet-Droplet Collisions

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