Abstract
The dynamics of droplets impacting on solid surfaces are widely encountered in industrial applications. This paper presents an experimental study of the spreading dynamics of droplets of liquids with a temperature-dependent viscosity on a heated horizontal sapphire surface. This surface can be heated between 40 and 90°C and allows for usual observation from different directions. The used liquids are glycerol water solutions with a volume percentage of 80%, 85.2%, and 92.8% glycerol, which feature a large dependency of the viscosity on the temperature. Using high-speed imaging and infrared thermography, the shape of the droplet and the temperature of the droplet surface in contact with the surface are measured, respectively. Our experiments reveal that the spreading of the droplets increases with an increase in the surface temperature, which is also expected as the effective viscosity of the liquid will decrease with an increase in the droplet temperature. However, the heating of the droplets ensures that these effects only are apparent after sufficient time to heat the droplet. In addition, the amplitude of the oscillations in the spreading of the surface will increase when the temperature of the surface is increased, which is also related to the decreased viscosity. Finally, the effects on the local spreading cannot be directly correlated to the temperature of the droplet in contact with the surface, which indicates that the viscosity in the droplet is not homogeneous during the experiment and local gradients in the viscosity are important in the overall spreading behaviour of the droplet.
| Original language | English |
|---|---|
| Pages (from-to) | 3971-3982 |
| Number of pages | 12 |
| Journal | Canadian Journal of Chemical Engineering |
| Volume | 103 |
| Issue number | 8 |
| Early online date | 18 Feb 2025 |
| DOIs | |
| Publication status | Published - Aug 2025 |
Bibliographical note
Publisher Copyright:© 2025 The Author(s). The Canadian Journal of Chemical Engineering published by Wiley Periodicals LLC on behalf of Canadian Society for Chemical Engineering.
Funding
This work is supported by the Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), which is an NWO Gravitation programme funded by the Ministry of Education, Culture, and Science of the government of the 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 would like to thank J. M. W. Aarts for the design and assembly of the experimental setup, L. A. H. J. de Graaf for the design of the heating element, and H. G. Fiedler for setting up the electronics part of the setup. Special thanks to V. V. Swami for sharing his knowledge about high-speed camera usage and surface tension measurements. This work is supported by the Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), which is an NWO Gravitation programme funded by the Ministry of Education, Culture, and Science of the government of the 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 would like to thank J. M. W. Aarts for the design and assembly of the experimental setup, L. A. H. J. de Graaf for the design of the heating element, and H. G. Fiedler for setting up the electronics part of the setup. Special thanks to V. V. Swami for sharing his knowledge about high‐speed camera usage and surface tension measurements.
Keywords
- digital image analysis
- droplet spreading
- heated surface
- high-speed visualization
- infrared thermography
- surface wettability
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