Photographic Observations of the Transient Contact Behavior of Oil-in-Water Emulsion Droplets Impinging on a Hot Substrate
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- Fujimoto Hitoshi
- Graduate School of Energy Science, Kyoto University
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- Takeshita Hiroaki
- Graduate School of Energy Science, Kyoto University
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- Ashida Masayoshi
- Graduate School of Energy Science, Kyoto University
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- Obana Wataru
- Graduate School of Energy Science, Kyoto University
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- Hama Takayuki
- Graduate School of Energy Science, Kyoto University
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- Takuda Hirohiko
- Graduate School of Energy Science, Kyoto University
Description
<p>Oil-in-water (O/W) emulsions are widely used as the working fluids in various metalworking processes. In this study, the transient liquid/solid contact behavior of O/W emulsion droplets impinging on a hot sapphire prism was experimentally investigated in order to gain insight on spray jet impingement in industrial applications. Three-directional flash photography method (with three digital cameras and four flashlights) was used to obtain the time evolutions of the droplet shape and liquid/solid contact behavior. Water, base oil, and O/W emulsions (oil concentration: 5, 15 mass%) were chosen as the test liquids. The experiments were conducted under a droplet impact velocity of 1.0 m/s and the pre-impact diameter of the droplets was ~2.3 mm. The temperature of the substrate was varied from 150°C to 400°C. The results showed that there was less direct liquid/solid contact at higher substrate temperatures because the boiling of water was more intense. There was no direct liquid/solid contact at a substrate temperature of 400°C. In addition, the direct liquid/solid contact areas were smaller for the O/W emulsion with higher oil concentration because of the vapor trapped between the solid surface and oil-rich liquid with high viscosity. Furthermore, it was found that the oil adhesion on the test substrate rarely occurred except at lower substrate temperatures.</p>
Journal
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- ISIJ International
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ISIJ International 59 (7), 1304-1313, 2019-07-15
The Iron and Steel Institute of Japan
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Details 詳細情報について
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- CRID
- 1390282763128920320
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- NII Article ID
- 130007679240
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- ISSN
- 13475460
- 09151559
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed