Thermocapillary instabilities in a liquid layer subjected to an oblique temperature gradient: Effect of a prescribed normal temperature gradient at the substrate
| العنوان: | Thermocapillary instabilities in a liquid layer subjected to an oblique temperature gradient: Effect of a prescribed normal temperature gradient at the substrate |
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| المؤلفون: | Ramkarn Patne, Alexander Oron, Yehuda Agnon |
| المصدر: | Physics of Fluids. 32:112109 |
| بيانات النشر: | AIP Publishing, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Fluid Flow and Transfer Processes, Physics, Range (particle radiation), Mechanical Engineering, Computational Mechanics, Liquid layer, Oblique case, Substrate (electronics), Mechanics, Condensed Matter Physics, Instability, Capillary number, Physics::Fluid Dynamics, Temperature gradient, Mechanics of Materials, Slippage |
| الوصف: | We consider thermocapillary instability in a three-dimensional liquid layer with a deformable interface with an ambient gas phase and subjected to an oblique temperature gradient when the temperature gradient at the substrate is prescribed. We demonstrate that this configuration leads to a drastic change in the instability features with respect to those emerging when either a purely vertical temperature gradient (VTG) or a purely horizontal temperature gradient (HTG) is present. In the case of the return flow as the base state, the spanwise long-wave instability mode dominates except for the range of small Bond numbers Bo. Slippage at the substrate has a stabilizing (destabilizing) effect on streamwise (spanwise) long-wave modes in the presence of a HTG. In the case of linear flow as the base state, both streamwise and spanwise long-wave modes play a major role in the instability onset depending on the ratio between the HTG and the VTG η for higher values of the capillary number Ca, e.g., Ca > 0.001. However, for lower values of Ca, e.g., Ca < 0.001, streamwise and spanwise instability modes become finite-waves at large η. In contrast to the return flow, for the linear flow, slippage at the substrate destabilizes both long-wave modes. |
| تدمد: | 1089-7666 1070-6631 |
| DOI: | 10.1063/5.0029477 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::56c19c441c6d48807c3a8a92d4c55ea8 https://doi.org/10.1063/5.0029477 |
| رقم الانضمام: | edsair.doi...........56c19c441c6d48807c3a8a92d4c55ea8 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10897666 10706631 |
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| DOI: | 10.1063/5.0029477 |